pinout.vvzero.com/src/en/overlay/analog-zero.md

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#Analog Zero

The RasPiO Analog Zero offers a compact, inexpensive, easy way to add eight analog channels to your Raspberry Pi. RasPiO Analog Zero uses an MCP3008 analog to digital converter. It's an SPI driven, 10-bit, 8-channel ADC.

With RasPiO Analog Zero you can:

  • read up to 8 analog inputs at once
  • make a weather station
  • make a digital thermometer
  • make a voltmeter
  • use potentiometer dials for control and display
  • read analog sensors or voltages
  • make your own embedded device with minimal footprint