I have a small breadboard project setup with a Pi 3 A+ that has been running for about a year, with an MCP3008 taking a reading from a photoresistor and driving a series of LEDs when the voltage changes more than a certain percentage over a given amount of time. I use the breadboard for other tests as well and have upgraded the Pi to Buster and Node-Red V1.
The node I am using is this: node-red-node-pi-mcp3008
I noticed the other day that the light based trigger didn't appear to be working. I double and triple checked my wiring, and I also started with a fresh copy of Buster Lite and the latest Node-Red V1.03 and it still doesn't work. I have tried all 8 pins, and tried swapping in another MCP3008 that I used once and it worked at that time. None of the pins return anything other than zero, although I confirmed that I am sending a variety of voltages between 0 and 3.3 while taking the readings.
Before I try replacing the Pi to see if hardware is the issue, has anyone else confirmed that this node works with Buster?