velleman Analog Input Extension Shield For Arduino Instruction Manual
- June 7, 2024
- Velleman
Table of Contents
ASSEMBLY MANUAL
OCTOBER 2016
ANALOG INPUT EXTENSION SHIELD FOR ARDUINO
Introduction
The Arduino UNO™ is equipped with 6 analog inputs but some projects call for
more. For example; sensor- or robot projects. The analog input extension
shield only uses 4 I/O lines (3 digital, 1 analog) but adds a whopping 24
inputs, so in total you have 29 analog inputs at your disposal.
Features:
- 24 analog inputs
- only 4 I/O lines are used
- stackable design
- complete with library and examples
- works with Arduino UNO™ and compatible boards
Specifications:
- analog inputs: 0 – 5 VDC
- uses pins: 5, 6, 7 and A0 on Arduino UNO™ board
- dimensions: 54 x 66 mm (2.1” x 2.6”)
In this manual, we will explain how to assemble the KA12 and how to install the included Arduino library with an example sketch.
What’s in the box
- 1 X PCB
- 1 X 470 Ohm resistor (yellow, purple, brown)
- 2 X 100k Ohm resistor (brown, black, yellow)
- 2 X ceramic multilayer capacitor
- 3 X resistor array 100k
- 1 X 3 mm red LED
- 4 X IC holder (16 pins)
- 4 X pin header with 6×3 pins
- 2 X 8 pin female header
- 2 X 6 pin female header
- 2 X 3 pin female header
- 3 X IC – CD4051BE
- 1 X IC – SN74HC595N
Building instructions
Position the 470 Ohm resistor as shown in the picture and solder.
R1: 470 Ohm (yellow, black, brown)
Position the two 100k Ohm
resistors as shown in the picture and solder them.
R2, R3 : 100k Ohm (brown, black, yellow)
C1, C2: ceramic
multilayered capacitors
RN1, RN2, RN3: resistor array 100k
LED: red LED
Mind the polarity!
IC1, …, IC4: IC holders
Mind the direction of the notch!
Solder all the 6×3 pin-
header connectors.
Make sure the bent pins are soldered!
Solder both the 6 pin female
headers and the 8 pin female headers into place.
Do not cut the pins!
SV1: two 3 pin female headers
Insert the pins on the solder side and solder on the component side! Make
sure the top of the headers are equally leveled and do not exceed the top of
the other pins. This way, it will fit nicely onto your Arduino Uno. Do not
cut the pins!
IC1, IC2, IC3 : IC – CD4051BE
Mind the direction of the notch! It should match the notch on the IC
holder!
IC4 : IC – SN74HC595N
Mind the direction of the notch! It should match the notch on the IC
holder!
Connecting the KA12
It is very important to insert the KA12 correctly onto the Arduino Uno to
avoid damage to the pins and to ensure a good connection.
Here are the most important attention points:
A. This 6 pin female header fits precisely into the ‘ANALOG IN’ on the
Arduino.
B. The two 3 pin female headers slide over the 6 ICSP pins on the Arduino.
C. The numbers beside the 8 pin female headers on the KA12 should correspond
with the Digital I/O’s.
D. Slide the pins carefully into the Arduino to prevent damage.
Installing the Arduino Library
-
Install the library:
Go to the KA12 download page on the Velleman website
http://www.vellemanprojects.eu/support/downloads/?code=KA12
Download the ‘velleman_KA12’ extract and copy the “velleman_KA12” folder to your Documents\Arduino\libraries. -
Example sketch:
A. Open the Arduino software
B. Then click file/Examples/Velleman_KA12/Velleman_KA12 -
The code:
Line by line
In order to make the KA12’s functions easy to use, we made a library.
Line 1 and 6 declare the use and initialize the library. This must be done in every sketch that uses the KA12. The library gives you the possibility to easily read all sensor values and save them in an int-array or to read one value and save this to an int.
To read all sensors you should declare an int-array with 24 places (line 2). To fill the array we use the read command (line 8). In the example, we display all the values to the serial monitor using a for loop (line 9 to 12).
The serial communication is set up in line 5.
If you only need one value you can use the “ka12_read” command (line 13).
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