Velleman KA07 User manual

Add a real time clock shield to your projects to ensure
accurate and easy timekeeping. While the shield keeps track
of time and date, the controller can focus on other tasks.
ILLUSTRATED ASSEMBLY MANUAL HKA07IP’1ILLUSTRATED ASSEMBLY MANUAL
KA07
RTC shield
for Arduino®
Features
• based on Maxim-Dallas DS1307 IC
• counts seconds, minutes, hours, date of month, day of the week, year and leap-year
• 12 or 24h system selectable
• AM/PM indication
• large user community
• requires 1 Arduino UNO™ (not included)
• stackable design: the shield can be stacked with other shields
Specifi cations
• I2C interface
• accuracy: 20ppm (depends on crystal)
• power consumption: 1.5mA
• with backup battery holder (500nA when running on battery)
• dimensions: 68 x 53mm / 2.67 x 2.08”

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- 5 -
assembly
hints
1. Assembly (Skipping this can lead to troubles ! )
Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully.
1.1 Make sure you have the right tools:
• A good quality soldering iron (25-40W) with a small tip.
• Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and
will protect the tip, and enables you to make good connections. When solder rolls off the tip, it needs cleaning.
• Thin raisin-core solder. Do not use any fl ux or grease.
• A diagonal cutter to trim excess wires. To avoid injury when cutting excess leads, hold the lead so they cannot
fl y towards the eyes.
• Needle nose pliers, for bending leads, or to hold components in place.
• Small blade and Phillips screwdrivers. A basic range is fi ne.
For some projects, a basic multi-meter is required, or might be handy.
1.2 Assembly Hints :
• Make sure the skill level matches your experience, to avoid disappointments.
• Follow the instructions carefully. Read and understand the entire step before you perform each operation.
• Perform the assembly in the correct order as stated in this manual.
• Position all parts on the PCB (Printed Circuit Board) as shown on the drawings.
• Values on the circuit diagram are subject to changes, the values in this assembly guide are correct*.
• Use the check-boxes to mark your progress.
• Please read the included information on safety and customer service.
* Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’ on a separate leafl et.
1.3 Soldering Hints :
1. Mount the component against the PCB surface and carefully solder the leads.
2. Make sure the solder joints are cone-shaped and shiny.
3. Trim excess leads as close as possible to the solder joint.

- 5 -
DO NOT BLINDLY FOLLOW THE ORDER OF THE
COMPONENTS ON THE TAPE. ALWAYS CHECK THEIR
VALUE ON THE PARTS LIST!
1. Assembly (Skipping this can lead to troubles ! )
Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully.
1.1 Make sure you have the right tools:
• A good quality soldering iron (25-40W) with a small tip.
• Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and
will protect the tip, and enables you to make good connections. When solder rolls off the tip, it needs cleaning.
• Thin raisin-core solder. Do not use any fl ux or grease.
• A diagonal cutter to trim excess wires. To avoid injury when cutting excess leads, hold the lead so they cannot
fl y towards the eyes.
• Needle nose pliers, for bending leads, or to hold components in place.
• Small blade and Phillips screwdrivers. A basic range is fi ne.
For some projects, a basic multi-meter is required, or might be handy.
1.2 Assembly Hints :
• Make sure the skill level matches your experience, to avoid disappointments.
• Follow the instructions carefully. Read and understand the entire step before you perform each operation.
• Perform the assembly in the correct order as stated in this manual.
• Position all parts on the PCB (Printed Circuit Board) as shown on the drawings.
• Values on the circuit diagram are subject to changes, the values in this assembly guide are correct*.
• Use the check-boxes to mark your progress.
• Please read the included information on safety and customer service.
* Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’ on a separate leafl et.
1.3 Soldering Hints :
1. Mount the component against the PCB surface and carefully solder the leads.
2. Make sure the solder joints are cone-shaped and shiny.
3. Trim excess leads as close as possible to the solder joint.

- 6 -
Construction
R1: 470 (4 - 7 - 1 - B)
R2: 2K2 (2 - 2 - 2 - B)
R3: 2K2 (2 - 2 - 2 - B)
R...
Resistors
1
IC-socket
4
Ceramic capacitor
Crystal
2
3
IC1: 8p
C1: 100nF (104)
X1: 32.768 MHz
C2: 100µF
JP1: Enable SQW output
JP2: I2C interface
JP3: I2C interface
LED
7
Male headers
8
Battery holder
6
Electrolytic capacitor
5
CONSTRUCTION
I
CR2032 VBAT SK6: 2 x 3p
c ...
c
...
Watch the polarity!
LD1: Green (5mm)
C (-)
Watch the
polarity!
Watch the position
of the notch!
2 x 8p
Jumper wire

- 7 -
Construction
Female headers
9
JP1: Enable SQW output
JP2: I2C interface
JP3: I2C interface
LED
Male headers
SK6: 2 x 3p
2 x 6p
LD1: Green (5mm)
2 x 8p
Do not cut the
connector pins!
2
Solder
1
3
Solder
IC
10
Watch the position
of the notch!
IC1: DS1307
A
B

- 8 -
General information
General information
II
Back-up battery: provides power to the shield when the Arduino Uno
is not active.
Place jumpers JP2 and JP3 when using the shield with the Arduino
Uno rev2 or Arduino 2009.
The IC drives an LED, which blinks at the same frequency as the
SQW output. Select via jumper JP1 whether this signal goes to pin
A3 of the shield.
The IC drives an LED, which blinks at the same frequency as the
SQW output. Select via jumper JP1 whether this signal goes to pin
The library allows you to manage the
frequency of the LED. Use command
RTC.sqw(x). Values for ‘x’:
0: LED off
1: 1 Hz
2: 4096 Hz
3: 8192 Hz
4: 32768 Hz
Download the library from www.vellemanprojects.eu.

- 9 -
Schematic diagram
X1
1
X2
2
VBAT
3
GND
4
VCC 8
SQW/OUT 7
SCL 6
SDA 5
DS1307
IC1
VCC
LED5MMLD1
VCC
GND
SCL
VCC
A5
A4
GNDGND
SDA
VCC
GND
A5
A4 A3
GND
SDA SCL
A3
GND
470
R1
100n
C1
100Á
C2
32.768K
X1
CR2032
BATTERY
SQWJP1
JP2 JP3
2k2
R2
2k2
R3
ARDUINO UNO
/RESET
0
3V
1
5V
2
GND2
3
GND1
4
VIN
5
A0
6
A1
7
A2
8
A3
9
A4/SDA
10
A5/SCL
11 D0 12
D1 13 D2 14 D3 15 D4 16 D5 17 D6 18 D7 19 D8 20 D9 21
D10 22 D11 23 D13 25 D12 24
GND 26
SDA 28
SCL 29
30
MISO 31
MOSI 32
SCK 33
GND 34
RESET 35
AREF 27
ARDUINO UNO
*

- 10 -
PCB

Supply voltage (V) - led voltage (V)
required current (A) = series resistance (ohms)
required current (A) = series resistance (ohms)
Required resistor power handling=
voltage over resistor x current passed trough resistor
9V - 1.7V
0.005A = 1460 ohm
9V - (3 x1.7V)
0.005A = 780 ohm
(9V - 1.7V) x 0.005A = 0.036W
closest value :
use a 1k5 resistor
use an
820 ohm resistor
a standard 1/4W resistor
will do the job
Supply voltage (V) - (number of leds x led voltage (V))
How to Calculate the series resistor:
Example: operate a red led (1.7V) on a 9Vdc source.
Required led current for full brightness: 5mA (this can be found in the datasheet of the led)
LEDs in series:
Example: 3 x red led (1.7V) on 9V battery
Required led current for full brightness: 5mA
(this can be found in the datasheet of the led)
Leds feature a specifi c voltage
drop, depending on type and
colour. Check the datasheet for
exact voltage drop and rated
current !
Never connect leds in parallel
Leds and how to use them
An open collector output can be compared to a switch which switches to
ground when operated
Example: How to switch an LED by means of an open collector output
open collector outputs

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Modifi cations and typographical errors reserved - © Velleman nv. HKA07’IP
Velleman NV, Legen Heirweg 33 - 9890 Gavere.