extension-board

This contains info about:

• Shield w/ ADC Interface
• List of analog sensors
• AD converter
• Level shifter

Shield

To read analog values, you need to enable SPI.

You can find how to in this README.

Two version of the board have been used:

• First version
• Second version

First used board version

The linksprite board has a 4-channel analog-to-digital converter. You need to use this to read values from analog sensors since the RaspberryPi doesn't have analog inputs.

Note that the board has a jumper to set VCC to 3.3V or 5V. Some devices will not work if it's the wrong setting...

Second used board version

The numbers disposed in the schema above are needed to inform to a given program where the sensor/actor is connected.

Analog Sensors

• temperature
• light (see linksprite documentation)
• noise level
• 3-axis accelerometer
• Rotary Potentiometer
• Magnet modul
• Heartbeat
• Magic light cup
• knock
• photocell

For the temperature sensor, use this python code to convert raw values to degrees celsius:

temp = (((value * 1000) - 500)/10)

• analogIn.py shows how to read the values
• analogInputDemo display all 4 values in real time; useful for test/debug