gerardwr wrote:Had no clue what a MCP23017 is, it's a I2C IO-expander with 16 GPIO pins.
I read somewhere about I2C IO-expanders with some digital AND analog IO's. Have some experience with them? Could be a solution for all the people that cry over not having a connection to the ADC TOUT pin on their ESP board.
http://www.analog.com/en/analog-to-digi ... oduct.html
8 pins that can be configured either as 12bit ADC, 12bit DAC, digital input or digital output. Internal reference, 0.2%
Should work even with the ESP-01.