seeed studio MMA7660FC User manual

SEEEDUINO FILM MOTION FRAME
User Manual v0.9c
Altitude | Pressure | Temperature | Motion Sensing | Data Logging
Nov 30, 2010
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LIFE SUPPORT DEVICE POLICY
Seeeduino Film Motion Frame and other products of Seeed Studio Inc are not designed,
intended or authorized for use in life support devices or systems Life support devices or
systems include, but are not limited to, surgical implants, medical systems, and other
safety-critical systems in which failure of Seeed Studio Inc products could cause personal
injury or loss of life Should buyer purchase and use Seeed Studio Inc products in such an
unauthorized and unintended manner, Buyer agrees to indemnify and hold harmless
Seeed Studio Inc, its officers, employees, suppliers, affiliates, and distributors from any
and all claims arising from such use, even if such claim alleges that Seeed Studio Inc was
negligent in the design or manufacture of its product
All trademarks are property of their respective owners.
Nov 30, 2010
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OVERVIE
Seeeduino Film Motion Frame is a motion sensing extension board designed for
Seeeduino Film Its flexible, ultra-slim and small form factor is suitable for building
wearable devices It consists of a Barometer (HP03M), a 3-axis Accelerometer Sensor
(MMA7660FC) and a 32 Mb serial Flash ( 25X32) This provide sensing and logging of
altitude, temperature, air pressure and motion for Seeeduino Film FILM and other
extension FRAMEs could be simply connected via the 20 pin universal bus like a chain Its
native 2 54mm pitch pins enable quick prototyping as well
FEATURES
•Flexible, Ultra small / Slim form factor
•Seeeduino Film compatible
•I²C Barometer
•I²C 3-Axis Accelerometer
•SPI 32M-BIT Serial Flash
•0 1” pitch pad breakout
•20 pin daisy-chain flex bus
•Transform by cutting and chaining
•Reinforced to increase endurance
APPLICATION IDEAS
•Weather Watching
•Environment Sensing
•Sports and Gyms
•Hiking / Climbing
•Hobby Aviation
•Security
•Data logging
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1.BLOCK DIAGRAM
The following block diagram presents the arrangement of various components of Motion
Frame Each module is connected by a 20 pin flex bus Motion Frame is attached to
Seeeduino Film with the help of a FPC socket
CAUTION
1 The direction of accelerometer is completely reversed in the board
2 The FFC socket and golden finger are easily lost or broken; pay more attention
while handling, especially do not bend or move too many times
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2.BAROMETER
The Hope RF – HP03M is used for pressure, altitude and temperature sensing It
consist of a piezo-resistive pressure sensor connected to an ADC It uses an I²C bus
to communicate with the Seeeduino Film(ATMega168) HP03M internally integrates
an I²C ADC and an I²C EEPROM The EEPROM maintains 11 coefficient data stored
during manufacturing These coefficient data should be used for calibration /
compensation of the measured values to find the real pressure and real temperature
The I²C ADC maintains the measured atmospheric pressure and temperature The I²C
EEPROM operation is compatible with 24C02
HP03M's SCL, SDA, XCLR are connected to Seeeduino Film's PC5, PC4 and PD4 &
PD5 as follows:
Fig: Barometer – Seeeduino Film Port Connection
XCLR:
•XCLR is connected to PD4 and PD5 of Seeeduino Film (PD4 default)
•XCLR is used to initialize the ADC / EEPROM operation
•Coefficient data should be read only after pulling XCLR to LOW
•Similarly XCLR should be pulled HIGH before start of an AD conversion cycle
Chip Address:
•ADC and EEPROM share a common I²C bus
•I²C ADC chip address is set to 0xEE
•I²C EEPROM chip address is set to 0xEF
Application Programming Interface (API):
HP03M library is provided in a Seeeduino (Arduino) compatible format Copy the
contents of the library folder to Arduino library folder to get started
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•The HP03M library provides two high level interfaces init() and read()
•There exist a pre-instantiated object Hp03m which is used to access the above
two interfaces
•The result of read() is available in Temperature, Pressure and Altitude
attributes(variables) provided by HP03M library The raw uncompensated
pressure and temperature values are available in D1 and D2 variables
init():
The init() interface initializes the I²C communication
•Configures Seeeduino PD4 as output
•XCLR (i e PD4) is pulled LOW to read calibration data
•Reads calibration data
read():
•XCLR (i e PD4) is pulled HIGH to read ADC data
•The raw temperature and pressure are read from ADC
•XCLR (i e PD4) is reset to LOW (to reset the sensor)
•The real temperature and pressure are calculated by compensating with the
coefficient data read during init() phase
•Altitude is calculated from the measured pressure
•The results are stored in Temperature, Pressure and Altitude
variables
The following two functions are used by the above read() function internally:
realTemperaturePressureCalculate():
•Calculate real temperature and pressure from raw value available in Hp03m D1
& Hp03m D2
altitudeCalculate():
•Calculate altitude from real atmospheric atmospheric pressure
Temperature:
•The real temperature in °C is available as float
Pressure
•The real air pressure in hP is available as float.
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Altitude
•The calculated altitude in 0 1m is available as long integer
The following simple example demonstrates the use HP03M library
#include <Wire.h>
#include <HP03M.h>
void setup()
{
Serial.be in(38400);
Hp03m.init();
}
void loop()
{
Hp03m.read(); // Read temperature, pressure and altitude
Serial.print("Temperature=");
Serial.println(Hp03m.Temperature);
Serial.print("Pressure=");
Serial.println(Hp03m.Pressure);
Serial.print("Altitude=");
Serial.println(Hp03m.Altitude);
delay(1000);
}
Algorithms and Timing diagrams:
The HP03M library provides a very simple interface to users All the low level functions
are carried out by the library The following section describes how Seeeduino interacts
with HP03M The overall operation can be summarized as below : -
Fig: Barometer Read Process
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Start
Read Compensation Data
Read Raw Temperature and Raw Pressure
Calculate real Pressure, real Temperature and real
Altitude by calibrating with compensation coefficients
init()
read()

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Algorithms:
Read Compensation Data:
The operation of HP03M EEPROM is compatible to 24C02 The following operation are
carried out to read the calibration data
1 Start I²C transmission
2 Send Slave Device Address 0x10
3 Read 18 bytes of data
4 Fill the compensation coefficient buffer(C1, C2, C3, C4, C5, C5, C7, AA, BB, CC
and DD) with the read data
5 Stop I²C transmission
Read Raw Pressure:
1 Pull XCLR HIGH
2 Start I²C transmission
3 Send command 0xFF
4 Send command 0xF0
5 Read 2 bytes of data
6 Fill the raw Pressure buffer(D1) with read data
7 Stop I²C transmission
8 Pull XCLR LOW
Read Raw Temperature:
1 Pull XCLR HIGH
2 Start I²C transmission
3 Send command 0xFF
4 Send command 0xE8
5 Read 2 bytes of data
6 Fill the raw Temperature buffer(D2) with read data
7 Stop I²C transmission
8 Pull XCLR LOW
Fig: Typical Timing diagram of Read Temperature and Pressure operation
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Calculate Real Temperature and Real Pressure:
Real Temperature and Pressure are calculated by using the below expressions provided
by the data sheet:
if D2>=C5 dUT= D2-C5 - ((D2-C5)/2^7) * ((D2-C5)/2^7) * A / 2^C
if D2 < C5 dUT= D2-C5 - ((D2-C5)/2^7) * ((D2-C5)/2^7) * B / 2^C
OFF=(C2+(C4-1024)*dUT/2^14)*4
SENS = C1+ C3*dUT/2^10
X= SENS * (D1-7168)/2^14 - OFF
Real Pressure
P=X*10/2^5+C7
Real Temperature
T = 250 + dUT * C6 / 2 ^ 16-dUT/2^D
Calculate the Altitude:
The altitude is calculated by using a look-up table Please refer the source code for
exact calculation
Application Ideas:
1 Predict Rain: A sudden fall in air pressure might bring rainfall Similarly, raise in
atmospheric pressure indicates clean sky
2.Energy Saver: The temperature sensor along with a RTC can be used to control Air
conditioners(AC) on time per day No sophisticated relay circuit needed An IR LED
connected to Seeeduino film can be used to control the AC as a remote
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3. THREE-AXIS ACCELEROMETER
Motion Frame is equipped with Freescale MMA7660FC 3-Axis accelerometer
MMA7660FC uses a capacitive type MEMS sensor and provides an I²C output The
device is capable of detecting acceleration in X, Y and Z direction It also supports tilt
orientation detection and gesture detection like shake detection and tap detection The
direction of accelerometer is reverse mounted on Motion Frame
MMA7660FC's SCL, SDA are connected to Seeeduino Film's PC5 and PC4
respectively:
Fig: Accelerometer – Seeeduino Film Port connection
Chip Address:
•I²C Slave address of MMA7660FC is set to 0x4C
Application Programming Interface (API):
•The MMA7660FC library provides two high level interfaces init() and
accelarationRead()
•The result of the accelarationRead() is available in accelarationData[3] array
in X, Y and Z order
init()
•The init takes care of initialization of MMA7660FC chip
•It begins the I²C communication with 0x4C as slave address
•It sets the mode of MMA7660FC operation to Active mode
accelarationRead()
•X, Y and Z values from acceleration is read by this function
•The result of this operation is stored in accelarationData[] array
•X, Y and Z values are provided in 6 bit 2's compliment signed byte format in the
allowable range of +31 to -32
The following simple example demonstrates the use MMA7660FC library The access
of functions and data variable of the library should be made through pre-instantiated
object Mma7660fc.
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#include <Wire.h>
#include <MMA7660FC.h>
void setup()
{
Serial.be in(38400);
Mma7660 c.init(); //Initialize Mma7660fc
}
void loop()
{
char Acc_x=0;
char Acc_y=0;
char Acc_z=0;
Mma7660 c.accelarationRead();// Read accelaration X, Y and Z
Acc_x = ((char)(Mma7660 c.accelarationData[0]<<2))/4 ;
Serial.print("Acc_x=");
Serial.println(Acc_x,DEC);
Acc_y = ((char)(Mma7660 c.accelarationData[1]<<2))/4 ;
Serial.print("Acc_y=");
Serial.println(Acc_y,DEC);
Acc_z = ((char)(Mma7660 c.accelarationData[2]<<2))/4 ;
Serial.print("Acc_z=");
Serial.println(Acc_z,DEC);
delay(1000);
}
Please refer the data sheet for the complete operation and full list of features provided by
3-Axis accelerometer Features like tilt detection, shake detection are not provided by the
library This can be implemented by the user
Application Ideas:
•Orientation detection : Accelerometer can be used whether the device is oriented
in portrait or landscape direction
•Acceleration control and Measurement: The 3 Axis acceleration provided by the
module can be used to control the acceleration of a toy airplane or toy helicopter It
can also be used as an acceleration measuring device when connected to a
suitable display device
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4.SPI SERIAL FLASH MEMORY
Motion Frame is equipped with inbond 25X32 SPI Flash memory It has a capacity of
32Mbit (4 Mega byte) Seeeduino Film PB3, PB4 and PB5 are connected to DI, DO and
CLK pins of W25X32 flash memory
Fig : Connection between Seeeduino Film and SPI Flash Memory
The chip uses 256 bytes per programmable page It supports a uniform 4K-byte sectors /
64K-byte blocks W25X32 is capable of supporting data transfer up to 150bits / seconds It
also supports sector(4KB) erase and block(64KB) erase commands
Application Programming Interface (API):
The following public interfaces are provided by 25Xnn library This library uses Spi
library available in Arduino Playground There exist a pre-instantiated object W25xnn for
accessing these methods Please refer the source code for know how these functions are
implemented
init():
Initialize the W25X32 flash memory device by setting chip select pin
deviceIn oGet():
Read and print manufacturer's and device's IDs
idleStatusWait():
Waits for idle status of the chip This is used before any new operation on the chip
statusRegisterRead():
Reads the status register of the chip
jedec():
Reads the JEDEC information of W25X32
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powerUp():
Sends power up command to W25X32
powerDown():
Sends power down command to W25X32
writeEnable():
Sends write enable command to W25X32
writeDisable():
Sends write disable command to W25X32
dataRead():
Reads len bytes of data from an address and stores it in a buffer pointed by pHead pointer
pageProgram():
Writes len bytes of data to an address from a buffer pointed by pHead pointer
sectorErase():
Erases a sector of memory pointed by address sector.
blockErase():
Erases a block of memory pointed by address block
chipErase():
Erases the complete chip
The following example demonstrate the use of 25Xnn library
#include <Spi.h>
#include <W25Xnn.h>
void setup()
{
unsi ned char data[]="W25X32 32M bit flash";
// Data to be written to the SPI flash
Serial.be in(38400);
W25xnn.init(); //initialize W25x32 serial Flash memory
W25xnn.idleStatusWait();
W25xnn.sectorErase(0x000000); //erase first sector
//W25xnn.blockErase(0x000000); //erase first block
//W25xnn.chipErase();
delay(300); //sector erase time 150~300ms
W25xnn.idleStatusWait();
W25xnn.pageProgram(0x000000,data,20);
Serial.println("<W25X32 32M bit flash> write to address 0x000000 to
0x000014");
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delay(10);
/* Serial.println("erasin ");
W25xnn.chipErase();//chip erase time 40s~80s
for(unsi ned char i=0; i<80;i++)
{
Serial.println(i,DEC);
delay(1000);
}
W25xnn.idleStatusWait();
Serial.println("erased");
*/
W25xnn.deviceIn oGet();
}
void loop()
{
unsi ned char temp_data[32];
unsi ned char i;
W25xnn.dataRead(0x000000,temp_data,20);
Serial.println("read data from address 0x000000 to 0x000014");
for(i=0;i<20;i++)
{
Serial.print(temp_data[i]);
}
Serial.println();
delay(1000);
}
Please refer to W25X32 data-sheet for complete information of operations supported by
the serial flash memory
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5.MECHANIC DIMENSIONS
The outline dimension is 77 5mm x 20 3mm x 3 45mm as below:
6.APPLICATION
Seeeduino Film Motion Frame can be used to build wearable devices You can even put
on a toy airplane or helicopter It can store status information like altitude, temperature or
acceleration to the Serial Flash These information can be retrieved later by connecting
Seeeduino Film to a PC The barometer can be used to predict weather 4 MB space
available in serial flash memory can be used to build a data logger
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7.SPECIFICATION
KEY SPECIFICATION Minimum Normal Maximum
Operating Voltage 3 0V 3 3V 3 6V
Operating Current - - 30mA
Power-down Current 30μA 65μA
Operating Temperature -20℃25℃60℃
Storage Temperature -30℃25℃70℃
Communication Protocol I²C and SPI
BAROMETER Minimum Normal Maximum
Operating Voltage 2 2V 3 3V 3 6V
Active RTC Crystal 1 5V 3 3V 5 5V
Communication Protocol I²C
I²C Speed 100kHz ~ 400 kHz
Absolute Pressure Accuracy ±1 5hPa @0~50 , 750~1100hPa℃
Absolute Pressure Accuracy ±3hPa @-20~60 , 750~1100hPa℃
Temperature Accuracy ±1 @ 0~50℃ ℃
Temperature Accuracy ±2 @ -20~60℃ ℃
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32M-BIT FLASH Minimum Normal Maximum
Operating Voltage 2 7V 3 3V 3 6V
Communication Protocol SPI
SPI Speed Up to 75MHz
Erase/Write cycles Up to 100000 cycles
Sector Erase/Write 4K Bytes
Page Program Up to 256 Bytes within 2ms
Data Retention 20 year
I²C 3-AXIS ACCELEROMETER Minimum Normal Maximum
Operating Voltage 2 4v 3 3v 3 6V
Communication Protocol I²C
I²C Speed 100kHz~400kHz
Maximum Acceleration (all axes, 100 μs) 10000 g
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8.SUPPORT
Please refer to product page for latest documents and development resources, any
product related issue could be inquired via info@seeedstudio com
9.REVISION HISTORY
Revision Descriptions Editor Release date
v0 9c Rewrite Added detailed description Visweswara R 30th November 2010
v0 9b Initial public release Lafier 5th October 2010
v0 9b-1 Change the parameters of barometer Lafier 26nd October 2010
10.LICENSE :
You can use the content of this document under the terms of Creative Commons
Attribution-NonCommercial-ShareAlike 3 0 Unported License Attribution should be made
to Seeed Studio Inc (www seedstudio com)
Source code and libraries are licensed under GPL/LGPL Please refer source code files for
exact terms of use
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