This repo will help you get started with using the PCF8591 A/D & D/A I2C capable converter.

To be able to run these examples you will need an ATmega328/128 microcontroller and a PCF8591 module. I picked up a really awesome module on Amazon that has a built in trim pot, photoresistor and thermistor. This allowed for very fast verification of communication and A/D sampling. This module also has an LED attached to the D/A converter for quick visual verification of values being written to it.

• Amazon link to the exact module I am using

Hooking up the PCF8591 module to your micocontroller is super easy. The only connections required are SDA,SCL,GND and VCC. Here is a table showing the I2C (TWI) pins on bare bones microcontrollers and the popular Arduino Uno.

My project is using an ATmega328p with a 16Mhz clock. Update CMakeLists.txt as needed:

• Microcontroller : set(MCU atmega328p)
• Clockspeed : set(F_CPU 16000000)
• Programmer: set(PROG_TYPE usbasp)

git clone https://github.com/patrick--/avr-i2c-adc
cd avr-i2c-adc
mkdir build
cd build
cmake ..
make flash