VeeaR EasyVR 3 User manual

EasyVR 3
User Manual
Release
1.0.11
www.veear.eu

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2EasyVR 3 User Manual (1.0.11)
Table of Contents
EasyVR 3 Module............................................................................................................................................. 5
Product Description........................................................................................................................................ 5
EasyVR 3 Features.................................................................................................................................... 5
Technical specifications................................................................................................................................. 6
Pin assignment .......................................................................................................................................... 7
Settings and indicators .............................................................................................................................. 8
Physical dimensions .................................................................................................................................. 8
Recommended Operating Conditions ....................................................................................................... 9
Power Supply Requirements..................................................................................................................... 9
Electrical Characteristics ........................................................................................................................... 9
Serial Interface......................................................................................................................................... 10
Microphone.............................................................................................................................................. 11
Audio Output............................................................................................................................................ 13
General Purpose I/O................................................................................................................................ 14
Flash Update ........................................................................................................................................... 15
Quick start for using the module .................................................................................................................. 16
EasyVR 3 as a Development Board........................................................................................................ 16
EasyVR Shield 3 for Arduino........................................................................................................................ 18
Product description ...................................................................................................................................... 18
EasyVR Shield 3 Features....................................................................................................................... 18
Technical specifications............................................................................................................................... 19
Board overview........................................................................................................................................ 19
Pin assignment ........................................................................................................................................ 20
Mode Jumper settings ............................................................................................................................. 20
Software Serial Pins settings................................................................................................................... 21
Quick start guide for using the Shield .......................................................................................................... 22
With Arduino Leonardo –Due (Native USB)........................................................................................... 22
With Arduino 2009 –Uno –Mega ........................................................................................................... 23
EasyVR Programming................................................................................................................................... 24
Communication Protocol.............................................................................................................................. 24
Introduction.............................................................................................................................................. 24
Arguments Mapping................................................................................................................................. 25
Command Details .................................................................................................................................... 26
Status Details........................................................................................................................................... 31
Communication Examples ........................................................................................................................... 34
Recommended wake up procedure......................................................................................................... 34
Recommended setup procedure ............................................................................................................. 34
Recognition of a built-in or custom SI command..................................................................................... 35
Adding a new SD command.................................................................................................................... 35
Training an SD command........................................................................................................................ 36
Recognition of an SD command.............................................................................................................. 36
Read used command groups................................................................................................................... 37
Read how many commands in a group................................................................................................... 37
Read a user defined command group..................................................................................................... 37
Use general purpose I/O pins.................................................................................................................. 38

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User Manual (1.0.11) EasyVR 3 3
Use custom sound playback.................................................................................................................... 38
Read sound table..................................................................................................................................... 38
Built-in Command Sets ................................................................................................................................ 39
Error codes................................................................................................................................................... 40
Protocol header file...................................................................................................................................... 41
EasyVR Arduino Library ............................................................................................................................... 42
EasyVR library settings................................................................................................................................ 42
Macros..................................................................................................................................................... 42
Detailed Description................................................................................................................................. 42
Macro Definition Documentation ............................................................................................................. 42
EasyVR Class Reference............................................................................................................................. 42
Public Types ............................................................................................................................................ 42
Public Member Functions........................................................................................................................ 43
Detailed Description................................................................................................................................. 44
Member Enumeration Documentation..................................................................................................... 44
Constructor & Destructor Documentation................................................................................................ 47
Member Function Documentation ........................................................................................................... 48
EasyVR Commander ..................................................................................................................................... 57
Getting Started............................................................................................................................................. 57
Speech Recognition..................................................................................................................................... 58
Recognition Settings.................................................................................................................................... 60
Phone Tones Generation (DTMF) ............................................................................................................... 61
Testing SonicNetTM ...................................................................................................................................... 61
Using Custom Data...................................................................................................................................... 63
Sound Table ............................................................................................................................................ 63
Speaker Independent Custom Vocabularies........................................................................................... 64
Updating Custom Data ............................................................................................................................ 65
Updating Firmware....................................................................................................................................... 67
QuickUSB Adapter Cable.............................................................................................................................. 68
Product Description...................................................................................................................................... 68
QuickUSB Features................................................................................................................................. 68
Technical Specifications............................................................................................................................... 68
Drawings and Schematics....................................................................................................................... 68
Pin Description......................................................................................................................................... 68
Operating Conditions............................................................................................................................... 69
Electrical Characteristics ......................................................................................................................... 69
QuickStart Instructions................................................................................................................................. 69
Software Setup ........................................................................................................................................ 69
Using the Adapter.................................................................................................................................... 69
How to get support........................................................................................................................................ 70

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4EasyVR 3 User Manual (1.0.11)
Document History Information
Revision
Date
Description
1.0
2015/01/27
Initial draft
1.0.3
2015/02/09
New drawings and updated descriptions
1.0.4
2015/03/19
Added new pictures and minor updates
1.0.5
2015/03/25
Update pictures and quickstart sections
1.0.6
2015/03/30
Added programming and library chapters
Added PC software description
Updated pictures and layout
1.0.7
2015/03/31
Minor corrections
1.0.8
2015/04/01
Updated custom data screenshots and description
1.0.9
2015/04/02
Added chapter for QuickUSB adapter
1.0.10
2015/04/22
Updated mechanical drawing of module
1.0.11
2015/06/05
Added note about soldering headers
Removed old logo from drawings

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User Manual (1.0.11) EasyVR 3 5
EasyVR 3 Module
Product Description
EasyVR 3 is a multi-purpose speech recognition module designed to
easily add versatile, robust and cost effective speech recognition
capabilities to almost any application.
The EasyVR 3 module can be used with any host with an UART
interface powered at 3.3V –5V, such as PIC and Arduino boards.
Some application examples include home automation, such as voice
controlled light switches, locks, curtains or kitchen appliances, or
adding “hearing” to the most popular robots on the market.
It can be easily plugged into a solder-less breadboard or standard
prototyping board, and it is compatible with the mikroBUS™
specifications (see www.mikroe.com/mikrobus).
Separate male headers are provided inside the package, along with a microphone cable assembly and
speaker wires (loudspeaker not included).
EasyVR 3 Features
Up to 28 custom Speaker Independent (SI) command vocabularies
1
.
Supported Languages:
oUS English
oBritish English
oFrench
oGerman
oItalian
oJapanese
oKorean
oMandarin
oSpanish
Up to 32 user-defined Speaker Dependent (SD) or Speaker Verification (SV) commands, that can be
trained in ANY language.
A selection of built-in Speaker Independent (SI) commands for ready-to-run basic controls, in the
following languages:
oEnglish (US)
oItalian
oGerman
oFrench
oSpanish
oJapanese
SonicNet technology for wireless communications between modules or any other sound source
(Audio CD, DVD, MP3 Player).
Up to 22 minutes of pre-recorded sounds or speech
2
.
DTMF tone generation.
Differential audio output that directly supports 8Ω speakers.
Easy-to-use Graphical User Interface to program Voice Commands and audio.
Standard UART interface (powered at 3.3V - 5V).
Simple and robust documented serial protocol to access and program through the host board.
6 General purpose I/O lines that can be controlled via UART commands.
1
A QuickT2SI™ Lite license (sold separately) is required to enable creation of Speaker Independent
vocabularies (maximum 12 commands per set).
2
At maximum compression rate.

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6EasyVR 3 User Manual (1.0.11)
Technical specifications
CABLES
MISC
SPEAKER
MIC
R4
D2
GPIO
IO1
SP+
AUDIO
IO2
SP-
IO3
VM
IO4
MIC
IO5
RET
IO6
VDD
MIKROBUS
XM
MIKROBUS
RST
DE
TX
RX
3V3
5V
GND
GND
PWR SEL
QUICK USB
D1
MISC
ADAPTER
MISC
The outer headers J1 and J2 are the mikroBUS™ interface connectors, providing selectable 3.3V/5V power
input to the module and voltage translated digital I/O lines, including: UART receive/transmit lines and control
pins.
The header J3 provides configurable I/O expansion lines (inputs with weak internal pull-up by default),
powered at the internal logic voltage VDD.
The header J4 contains the main analog signals, such as microphone signals and amplified DAC outputs,
which are also available on the internal right angle connectors J5 and J6.
The module can also be operated through the programming connector J7 alone, by using the QuickUSB
adapter/cable.

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User Manual (1.0.11) EasyVR 3 7
Pin assignment
Group
Name
Number
Pin
Type
Description
●
MIKROBUS
J1
1
-
-
(Not connected)
2
RST
I
Active low asynchronous reset (internal pull-up)
3-6
-
-
(Not connected)
7
3V3
I
3.3V DC power input
8
GND
-
Ground
J2
1
XM
I
Boot select (internal pull-down)
2
DE
O
(Reserved)
3
TX
O
Serial Data Transmit
4
RX
I
Serial Data Receive
5-6
-
-
(Not connected)
7
5V
I
5.0V DC power input
8
GND
-
Ground
●
GPIO
J3
1
IO1
I/O
General purpose I/O (VDD logic levels)
2
IO2
I/O
General purpose I/O (VDD logic levels)
3
IO3
I/O
General purpose I/O (VDD logic levels)
4
IO4
I/O
General purpose I/O (VDD logic levels)
5
IO5
I/O
General purpose I/O (VDD logic levels)
6
IO6
I/O
General purpose I/O (VDD logic levels)
●
AUDIO
J4
1
SP+
O
Differential audio output (can directly drive 8Ω
speaker)
2
SP-
O
3
VM
O
Microphone power (to support custom
microphones)
4
MIC
I
Microphone audio input
5
RET
-
Microphone return (analog ground)
6
VDD
O
Internal logic voltage (for reference only)
●
CABLES
J5
1
SP-
O
Differential audio output (can directly drive 8Ω
speaker)
3
SP+
O
2
-
-
(Not connected)
J6
1
MIC
I
Microphone audio input
2
RET
-
Microphone return (analog ground)
●
ADAPTER
J7
1
RX_P
O
Programming cable serial data receive
2
RTS_P
I
Programming cable request to send (reset/boot
control)
3
GND
-
Programming cable ground
4
5V_P
I
Programming cable 5V DC power output
5
TX_P
I
Programming cable serial data transmit
6
CTS_P
O
Programming cable clear to send (tied to ground)

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8EasyVR 3 User Manual (1.0.11)
Note: The General Purpose I/O lines (J3.1-6) are at nominal 3.0VDC level. Do not connect
higher voltages directly to these pins!
Settings and indicators
Group
Name
Type
Description
●
MISC
PWR SEL
3-Way Jumper
(SMD 0603)
Select power input and voltage level between +3.3V
and +5V with a zero Ohm resistor or solder bridge
D1
LED
Red light indicator, normally ON when the board is
powered, briefly blinking on serial data received
D2
LED
Green light indicator, turns ON when the module is
listening to its audio input
R4
Resistor
(SMD 0603)
Microphone gain resistor, default is 1.2kΩ
Physical dimensions
Symbol
Parameter
Units (mm / Inches)
W
Width
25.4
1.000
L
Length
56.4
2.220
H1
Height (without outer strips J1-J4)
9.5
0.375
H2
Height (with outer strips J1-J4)
17.0
0.670
E1
Connector pitch and pin spacing (of outer strips J1-J4)
2.54
0.100
E2
Connector pitch (of inner connectors J5-J7)
2.00
0.079
A
Headers horizontal spacing
22.86
0.900
B
Headers vertical spacing
20.32
0.800
C
Header vertical offset
3.81
0.150
D
Header horizontal offset
1.27
0.050
L
W
E2
E2
E1
E2
E2
E1 E1
E1
A
C
B
DD
H1
H2
W
L

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User Manual (1.0.11) EasyVR 3 9
Recommended Operating Conditions
Symbol
Parameter
Min
Typ
Max
Unit
5V
DC Power Input (Host) = VSEL
3.15
5.0
5.5
V
3V3
3.15
3.3
5.5
V
5V_P
DC Power Input (Programming cable)
4.0
5.0
5.5
V
Ta
Ambient Operating Temperature Range
0
25
70
°C
Power Supply Requirements
Symbol
Parameter
Min
Typ
Max
Unit
ISLEEP
Sleep current (VSEL = 5.0V)
6
mA
IOPER
Operating current (VSEL = 5.0V)
25
35
mA
IAUDIO
Audio playback current (with 8Ωspeaker)
175
250
mA (RMS)
ITOT
Total current consumption (excluding I/O)
25
285
mA (RMS)
IPEAK
Peak supply current (excluding I/O)
400
mA
Electrical Characteristics
These are applicable to pins RX, TX_P.
Symbol
Parameter
Min
Typ
Max
Unit
VIH
Input High Voltage
2.1
5.5
V
VIL
Input Low Voltage
0.0
0.9
V
IIL
Input Leakage Current (0 < VI< 5.5V)
-65
µA
These are applicable to pins TX, DE.
Symbol
Parameter
Min
Typ
Max
Unit
VOH
Output High Voltage (IOH = -0.3 mA, VSEL = 3.3V)
2.6
3.3
V
Output High Voltage (IOH = -0.3 mA, VSEL = 5.0V)
4.3
5.0
V
VOL
Output Low Voltage (IOL = 5 mA)
0.0
0.2
V
These are applicable to pin XM.
Symbol
Parameter
Min
Typ
Max
Unit
VIH
Input High Voltage
1.4
(0.8)
5.5
V
VIL
Input Low Voltage
0.0
(0.7)
0.5
V
IIN
Input Current (0 < VI< 3.3V)
0
0.2
0.4
mA
Input Current (0 < VI< 5.5V)
0
0.5
0.7
mA
These are applicable to pin RST.
Symbol
Parameter
Min
Typ
Max
Unit
VIH
Input High Voltage
2.1
5.5
V
VIL
Input Low Voltage
0.0
0.6
V
IIL
Input Leakage Current (0 < VI< 5.5V)
-85
µA

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10 EasyVR 3 User Manual (1.0.11)
These are applicable to pin RX_P.
Symbol
Parameter
Min
Typ
Max
Unit
VOH
Output High Voltage (IOH = -5 mA)
2.4
3.0
V
VOL
Output Low Voltage (IOL = 8 mA)
0.0
0.6
V
These are applicable to pins IO1 –IO6.
Symbol
Parameter
Min
Typ
Max
Unit
VIH
Input High Voltage
2.4
3.0
3.3
V
VIL
Input Low Voltage
-0.1
0.0
0.75
V
IIL
Input Leakage Current (0 < VI< 3V, Hi-Z Input)
<1
10
µA
RPU
Pull-up Resistance
Strong
10
kΩ
Weak
200
kΩ
VOH
Output High Voltage (IOH = -5 mA)
2.4
3.0
V
VOL
Output Low Voltage (IOL = 8 mA)
0.0
0.6
V
Serial Interface
The EasyVR 3 communicates via an asynchronous serial interface (commonly known as UART interface),
with the following features:
Baud Rate: 9600 (default), 19200, 38700, 57600, 115200
Frame: 8Data bits, No parity, 1Stop bit
The receiver input data line is RX, while the transmitter output data line is TX. No handshake lines are used.
Example of a serial data frame representing character “A” (decimal 65 or hexadecimal 41):
VCC
Idle
Start
1
0
0
0
0
0
1
0
Stop
Idle
0V
See also chapter Communication Protocol later on this manual for communication details.

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User Manual (1.0.11) EasyVR 3 11
Microphone
The microphone provided with the EasyVR 3 module is an omnidirectional electret condenser microphone
(Horn EM9745P-382):
Sensitivity -38dB (0dB=1V/Pa @1KHz)
Load Impedance 2.2K
Operating Voltage 3V
Almost flat frequency response in the range 100Hz –20kHz
The microphone circuit is optimized for use at ARMS_LENGTH (default, about 60cm) or FAR_MIC distance
settings.
If you use a microphone with different specifications the recognition accuracy may be adversely affected.
Differences in rated load impedance and sensitivity can be compensated to a certain extent by changing the
microphone gain. This can be done in several ways:
Replacing the internal gain resistor R4 (1.2kΩ)
Adding an external resistor Rx going in parallel with R4 (it can only reduce gain, useful for HEADSET
distance settings)
Removing the internal resistor R4 and using only the external resistor Rx
MIC
VM
RET
3V
AGND
R4
1.2kΩ
Module
Internals
External
Microphone
+
-
Rx Optional
Microphone circuit
Modifying gain resistance
You can calculate the overall microphone gain resistance using the formula below:
   


Rs is the optimal microphone gain resistance
Iis the impedance rating of the microphone
Gis the desired overall system gain, defined as follows:
1. If the module is configured for HEADSET microphone distance (typically a few centimeters from the
user’s mouth), then the overall system gain should be -49 dB (0dB=1v/Pa@1KHz);
2. If the module is configured for ARMS_LENGTH microphone distance (typically 60-90 cm from the
user's mouth –this is the default setting of EasyVR), then the overall system gain should be -44 dB;
3. If the module is configured for FAR_MIC microphone distance (up to about 3 meters from the user's
mouth), then the overall system gain should be -43 dB.
S is the sensitivity rating of the microphone you want to use, and it is specified in –dB in the microphone’s
specification
3
.
3
Converting uBars to Pascal: microphone manufacturers specify the sensitivity referencing to uBars or
Pascal. If the microphone sensitivity is referenced to uBars, simply add 20 dB to the rating. For example, -58
dB/uBars + 20dB = -38 dBV/Pa.

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12 EasyVR 3 User Manual (1.0.11)
Examples
1) The optimal gain resistance for the bundled microphone at ARMS_LENGTH distance is:
 
󰇛󰇜
 
Use the closest standard 5% resistor to Rs. In this example, it would be 1.1 kΩ. The EasyVR uses a 1.2 kΩ
resistor to allow use of “FAR” settings without replacing the internal resistor.
Sometimes you might also need to compensate some gain loss for a voltage lower than the microphone
ratings (using a larger resistor value sets a higher input gain).
2) The gain resistance for the bundled microphone at HEADSET distance would be:
 
󰇛󰇜
 
In this case you may just add an external 1.2 kΩresistor to get a gain resistance of 600 Ω(close enough).
Positioning guidelines
Please note that improper acoustic positioning of the microphone will reduce recognition accuracy. Many
mechanical arrangements are possible for the microphone element, and some will work better than others.
When mounting the microphone in the final device, keep in mind the following guidelines:
1. Flush Mounting - The microphone element should be positioned as close to the mounting surface
as possible and should be fully seated in the plastic housing. There must be no airspace between
the microphone element and the housing. Having such airspace can lead to acoustic resonance,
which can reduce recognition accuracy.
2. No Obstructions, Large Hole - The area in front of the microphone element must be kept clear of
obstructions to avoid interference with recognition. The diameter of the hole in the housing in front of
the microphone should be at least 5 mm. Any necessary plastic surface in front of the microphone
should be as thin as possible, being no more than 0.7 mm, if possible.
3. Insulation - The microphone should be acoustically isolated from the housing if possible. This can
be accomplished by surrounding the microphone element with a spongy material such as rubber or
foam. The provided microphone has this kind of insulating foam. The purpose is to prevent auditory
GOOD
BAD
cavity
clear area
internal
diaphragm

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User Manual (1.0.11) EasyVR 3 13
noises produced by handling or jarring the device from being “picked up” by the microphone. Such
extraneous noises can reduce recognition accuracy.
4. Distance - If the microphone is moved from 15 cm to 30 cm from the speaker’s mouth, the signal
power decreases by a factor of four. The difference between a loud and a soft voice can also be
more than a factor of four. Although the internal preamplifier of the EasyVR compensates for a wide
dynamic range of input signal strength, if its range is exceeded, the user application can provide
feedback to the speaker about the voice volume (see appendix Error codes).
Audio Output
The EasyVR 3 audio output interface is capable of directly driving an 8Ωspeaker. It can also be connected
to an external audio amplifier to drive lower impedance loudspeakers.
Note: Connecting speakers with lower impedance directly to the module may permanently
damage the EasyVR audio output or the whole module.
It is possible to connect higher impedance loads such as headphones, provided that you scale down the
output power according to the speaker ratings, for example using a series resistor. The exact resistor value
depends on the headphone sensitivity and the desired output volume (usually in the order of 1-10kΩ).
Note: Connecting headphone speakers directly to the EasyVR audio output may damage your
hearing.
absorbent
material
fastened
directly
GOOD
BAD

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14 EasyVR 3 User Manual (1.0.11)
General Purpose I/O
Since the EasyVR communication interface takes two pins of the host controller, a few spare I/O pins are
provided, which can be controlled with the communication protocol, to get those pins back for basic tasks,
such as lighting an LED or reading a switch.
The six I/O pins IO1–IO6 are connected directly to the embedded microcontroller on the EasyVR module, so
they are referenced to the internal 3.0V regulated power supply VDD. If you need to interface to circuits
using a different supply, there are a number of solutions you can adopt. Some of these are outlined below
(here IOn indicates any one of the six I/O pins of the EasyVR).
Use a pin as an output
All the I/O pins are inputs with weak internal pull-up after power on. You must explicitly configure a pin before
you can use it as an output (see the example code Use general purpose I/O pins).
IOn
LED
IOn
Inverted
OUT
5V
IOn -
12V
RELAY
Z
Switched
Load
AC MAINS
Voltage
I/O pin directly driving a
low-current LED
I/O pin connected to high
impedance 5V circuit (such as
MCU input pin)
I/O pin switching a load on a high voltage
line using a 12V relay
The exact components values in these circuits may vary. You need to calculate required values for your
application and choice of components. For example, resistor value for the LED circuit can be calculated
approximately as:
 
   

Where VLED is the LED forward voltage, as reported on the LED datasheet, at the driving current IOH (see
section Electrical Characteristics). Let’s assume a typical low-current LED has a VF=1.8V at 5mA, the
resistor value is:
   
 
Now stay on the safe side and choose a slightly larger resistor, such as 150Ω.
If you want to drive higher current LEDs, you need a circuit like the second one, where you put the LED
between the output resistor and the collector of the NPN transistor.
Use a pin as an input
All the I/O pins are inputs with weak internal pull-up after power on or reset. You may also configure the pin
to have a strong pull-up or no pull-up at all (see the example code Use general purpose I/O pins).

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User Manual (1.0.11) EasyVR 3 15
IOn
SWITCH
optional
filter
IOn
5V
IN
IOn Isolated
IN
optocoupler
I/O pin connected to a switch
(or switching sensor)
I/O pin connected 5V source
(such as MCU output pin)
I/O pin with isolated input (for safety
circuits)
All these circuits assume the EasyVR pin has been configured with an internal pull-up (passive components
value can be adjusted to account for weak or strong pull-up).
Disabling the internal pull-up could be used to put the pin in high-impedance state, for example to simulate a
tri-state or open-drain output port.
Again, you should refer to the manufacturer’s datasheet when interfacing any external components and to
calculate required resistors values or other passive components.
Flash Update
The EasyVR module includes a boot loader that allows to update the firmware and to download new sound
tables or custom grammars to the on-board memory.
The boot mode is activated by keeping the XM signal to a high logical level at power on or reset. This can be
easily done with a jumper (or switch) taking the signal to a suitable pull-up resistor.
To download a firmware update, a sound table or a custom grammar to the EasyVR, power on the module
with the jumper closed. For normal operation, just leave the jumper open. Do not change the jumper position
while the module is already powered on. It is safe to change XM level while the module is reset (RST low).
/XM
VCC
Jumper
Internal
Pull-down
Boot mode selection circuit
To learn how to download new sound tables or custom grammars to your EasyVR 3 module, have a look at
the section Using Custom Data.

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16 EasyVR 3 User Manual (1.0.11)
Quick start for using the module
EasyVR 3 as a Development Board
The QuickUSB serial adapter cable can be used to program voice
commands and sound outputs into an EasyVR 3 module and
quickly test it from your PC.
Just connect the microphone and an 8Ωspeaker to the module,
plug-in the adapter cable and you are ready to go.
The EasyVR 3 boot mode is managed automatically through the
serial handshake lines, so you don’t need to set any jumper.
How to get started
1. Connect the microphone to the 2-way socket MIC (J6)
2. Connect an 8Ωspeaker to the 3-way socket SPEAKER (J5)
3. Connect a QuickUSB cable to the 3x2 pins socket (J7)
4. Plug the USB end of the adapter cable to your PC.
The first time it may take some time to install the required drivers (see Software Setup)
5. If your installation is successful you will see a new virtual COM port in your Device Manager:
(The actual COM port number may vary)
6. Now start the EasyVR Commander software
7. Choose your COM Port and click connect
8. Then enjoy your EasyVR!

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User Manual (1.0.11) EasyVR 3 17
Serial Adapter Interface
Connector J7 is a 6-pin socket specifically designed for the QuickUSB serial adapter cable, but another
adapter may also be used provided that it uses the same connector type, pin assignment and electrical
specifications.
Pin
Name
Type
Notes
1
RX_P
I
Adapter should have TTL/LVTTL compatible inputs (VIH = 2.0V)
2
RTS_P
O
Adapter outputs can have 3.3V or 5V levels
RTS handshake is required for automatic reset and boot mode control
3
GND
-
Ground
4
5V_P
O
Adapter should provide a 5V DC power output for the module
(see Recommended Operating Conditions and Power Supply
Requirements)
5
TX_P
O
Adapter outputs can have 3.3V or 5V levels
6
CTS_P
I
CTS is tied to GND on the module
Connector type is Hirose DF11 Series (female on the adapter cable, male on the module).

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18 EasyVR 3 User Manual (1.0.11)
EasyVR Shield 3 for Arduino
Product description
The EasyVR Shield 3 is an adapter board for the EasyVR 3
module, designed to simplify its use among the Arduino
community.
The Shield is compatible with any Arduino board using UNO-
R3 Shield headers, running at either 3.3V or 5V levels, by
using the IOREF pin to select the EasyVR operating voltage.
It is also backward compatible with earlier Arduino boards that
don’t have the IOREF pin, which are using 5V I/O levels by
default.
If your board does not have the IOREF pin but it is running at 3.3V, you can still operate the EasyVR Shield 3
correctly if you manually connect pins IOREF and 3V3 together, for example with a jumper wire.
The board comes with separate Arduino stackable headers for the Shield interface. The EasyVR 3 module is
also provided separately.
Note: The EasyVR 3 module and all stackable headers must be soldered before use!
EasyVR Shield 3 Features
Compatible with Arduino boards that have the 1.0 Shield interface (UNO R3) and legacy boards
including, but not limited to:
oArduino Duemilanove
oArduino Uno
oArduino Mega
oArduino Leonardo
oArduino Due
Supports 5V and 3.3V main boards through the IOREF pin
Supports direct connection to the PC on main boards with a separate USB/Serial chip and a special
software-driven “bridge” mode on boards with only native USB interface, for easy access by the
EasyVR Commander
Enables different modes of serial connection and also flash updates to the embedded EasyVR
module (through the Mode Jumper)
Supports remapping of serial pins used by the Shield (in SW mode)
Provides a 3.5mm audio output jack suitable for headphones or as a line out
EasyVR Shield 3 fully assembled

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User Manual (1.0.11) EasyVR 3 19
Technical specifications
Board overview
PROG
MODE JUMPER
LED
SW
HW
PC
UP
LEO
EASYVR
GPIO
IO1
IO2
IO3
IO4
IO5
IO6
ARDUINO
POWER
IOREF
RESET
3V3
5V
GND
GND
VIN
ARDUINO
ANALOG
A0
A1
A2
A3
A4
A5
SDA
ARDUINO
DIGITAL
SCL
AREF
GND
13
12
11
10
9
8
7
ARDUINO
DIGITAL
6
5
4
3
2
1
0
3.5mm JACK
MIC
SPEAKER
LINE OUT
EASYVR AUDIO
(Top View)
SW SERIAL
PINS
SW SERIAL
PINS
TX –D13
D9 –TX
RX –D12
D8 –RX
(Detail –Bottom View)

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20 EasyVR 3 User Manual (1.0.11)
Pin assignment
Group
Pin
Description
●
ARDUINO
HEADERS
-
Arduino UNO-R3 Shield interface, pass-through connectors
(Pins 0-1 are in use when J12 is set to UP, PC, HW or LEO)
(Pins 12-13 or 8-9 are in use when J12 is set to SW)
●
EASYVR
AUDIO
-
Audio cables connectors of the EasyVR 3 module (microphone and
speaker)
●
LINE OUT
-
3.5mm stereo/mono jack (16Ω- 32Ωheadphones or line-level output)
●
MODE
JUMPER
SW
Arduino Software Serial (connected to pins 12-13 or 8-9)
HW
Arduino Hardware Serial (connected to pins 0-1)
PC
PC Mode (Arduino disabled, EasyVR in command mode)
UP
Update Mode (Arduino disabled, EasyVR in boot mode)
LEO
Leonardo Update (Arduino enabled, EasyVR in boot mode)
●
PROG
-
Red light indicator for Flash programming modes (UP and LEO)
●
SW SERIAL
PINS
RX
Use resistor to select Software Serial RX pin: 12 or 8
TX
Use resistor to select Software Serial TX pin: 13 or 9
●
EASYVR
GPIO
IO1
General purpose I/O as found on the embedded EasyVR 3 module
(referenced at the internal VDD logic level –see note below)
IO2
IO3
IO4
IO5
IO6
Note: The General Purpose I/O lines (IO1-IO6) are at nominal 3.0VDC level. Do not connect
higher voltages directly to these pins!
Mode Jumper settings
This jumper selects the operating mode of the EasyVR Shield and it can be placed in one of four positions:
oSW –Software Serial mode
Use it for controlling the EasyVR module from your Arduino sketch through a software serial port
(using pins 12-13). You can also connect the EasyVR Commander in this mode, provided that the
running sketch implements bridge mode (see the Arduino library examples).
oHW –Hardware Serial mode
Use it for controlling the EasyVR module from your Arduino sketch through the hardware serial port
(using pins 0-1).
oPC –PC Connection mode
Use it for direct connection with the EasyVR Commander. In this mode, the Arduino controller is held
in reset and only the embedded USB/Serial adapter is used.
oUP –Flash Update mode
Use it for firmware updates or to download sound table data and custom grammars to the on-board
flash memory from the EasyVR Commander. In this mode, the Arduino controller is held in reset and
only the embedded USB/Serial adapter is used. The EasyVR module is set in boot mode.
oLEO –Leonardo Update mode
This is similar to the regular Flash Update mode, for Arduino boards that don’t have a separate
USB/Serial adapter, such as Arduino Leonardo. The EasyVR module is set in boot mode, but the
Arduino controller is not reset and it must be running the special “bridge” sketch.