Also don’t attempt to use an Analog channel as a digital input next to an analog channel. The cross talk makes the analog reading completely wrong if the input next to it is high. I’m using the sparkfun board on a pcb with a solid ground plane btw. The digital input is logic high steady state and the analog voltage is 0.4V. I’m using the 0.6Volt reference mode as no one can help me change it to 3.3.
When the digital channel goes high the analog input is bumped up another 0.3 volts or so by the cross talk.
Kevin