Adafruit dac digital to analogue converter 12 bit i2c mcp4725 adafruit 935 p the adafruit mcp4725 12 bit dac breakout board is an ideal choice when your project needs analogue output but pwm isn t analogue enough simply attach the board to the i2c port on your microcontroller mcu and send the value of output voltage you want select either i2c address 0x62 or 0x63 or attach 2 x dac boards to the same mcu if your mcu supports 3 4mbits per second fast mode i2c not arduino then the outp