Quiet the noise

Every ADC reading carries some noise. This MCP3008 is on a noisy board: a single read wanders by several counts. Averaging N reads shrinks the noise by √N.

Build: a potentiometer on channel 0 of an MCP3008 on SPI with CS on CE0 (the knob + ADC board kit is pre-wired).

Program: every 0.5 s take 64 readings of channel 0 (with spidev or gpiozero's MCP3008(channel=0).raw_value), average them and print the rounded result:

Knob: 410

The test sets the knob to 40 % (ideally 409.6 counts), then 80 % (819.2) at 3 s. Every printed value must be within ±2 counts of the ideal.