Reply To: MCP3008 gives 0 or 1023 only: how do I prove SPI works on a Pi 3B+?

CE0 vs CE1, of course. CS was on pin 24 and the code said 1. Changed it to spi.open(0, 0) and channel 0 now reads 412 with the tank half full, channel 1 floats like it should. Loopback test passed too, so I’ll keep that one. Sending mA now and scaling in the flow as twilson said.