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.
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.
| Pin Function | ATmega328p | ATmega128 | Arduino UNO |
|---|---|---|---|
| SDA | PC4 | PC4 | Analog Input 4 |
| SCL | PC5 | PC5 | Analog Input 5 |
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