Welcome to i2c2pwm rev.0.1 by Kadir Mueller in 2017.                         

 i2c2pwm is a 3-channel PWM controller firmware for your AVR controller. The
PWMs individual duty cycles can be controlled via I2C. And yes, I know already
that there are complete chips out there that are doing exactly this job.
 i2c2pwm makes an I2C-slave out of your AVR MCU. Its I2C-address defaults to
0x2a (customizable in Makefile). At this address you can access five registers:
  0: PWM duty cycle of PB1.
  1: PWM duty cycle of PB2.
  2: PWM duty cycle of PB3.
  4: When !=0: On every loop, set PB5 (Arduino internal LED) high for some ms.
  5: When !=0: On every loop, dump the registers contents to serial.

 i2c2pwm uses the TWI-Slave code of uwegw from "http://rn-wissen.de". I've used
both twislave.c and twislave.h from:
http://rn-wissen.de/wiki/index.php?title=TWI_Slave_mit_avr-gcc

 Please see http://www.theflatnet.de/i2c2pwm/ for license and more information.