11 Jan 2019

Two versions of the circuit were created and tested:

- Version 020 which used shift registers for controling the drivers along with a 4 bit R-2R DAC

- Version 010 which used the PCA9685 with a digital potentiometer to control the drivers

Both versions worked well with different benefits. First version was cheaper and the second offered more control via I2C for slight increase in cost.

Eventually, I had decided on using the I2C version for testing and development.