example showing using gain capability #23
Description
we got a bunch o requests to add a gain demo to https://learn.adafruit.com/adafruit-4-channel-adc-breakouts/python-circuitpython
no rush but it is kinda a neat thing this chip can do :) the demo can just be a resistor divider with 1K and 100K ohm resistors. the voltage should end up being the same but the value will be different