Lickometer
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Raspberry PI Lickometer
Touch Sensor
Datasheet for MPR121: https://cdn-shop.adafruit.com/datasheets/MPR121.pdf
Materials
Total: $124.80 (not including shipping, about $30)
| Item PID Price Quantity Total |
|---|
| Raspberry Pi 3 Model B Starter Pack - Includes a Raspberry Pi 3 3058 $84.95 1 $84.95 |
| Adafruit Capacitive Touch HAT for Raspberry Pi - Mini Kit - MPR121 2340 $14.95 1 $14.95 |
| Adafruit Perma-Proto Half-sized Breadboard PCB - Single 1609 $4.50 1 $4.50 |
| Small Alligator Clip Test Lead (set of 12) 1008 $3.95 1 $3.95 |
| Adafruit Capacitive Touch HAT for Raspberry Pi - Mini Kit - MPR121 2340 $14.95 1 $14.95 |
| Brass M2.5 Standoffs for Pi HATs - Black Plated - Pack of 2 2336 $0.75 2 $1.50 |
Software
Patch for I2
"the latest Raspbian Jessie and Stretch releases have an updated I2C driver that isn't compatible with how this library enables repeated I2C start bits. From the thread about this issue there's a workaround to enable the older I2C driver. Edit the /boot/config.txt on your SD card and add:
dtoverlay=i2c-bcm2708
Dependencies
sudo apt-get update sudo apt-get install build-essential python-dev python-smbus python-pip git