[TriEmbed] ADC

[Martin Brooke]

https://smile.amazon.com/Adafruit-MCP3008-8-Channel-Interface-Raspberry/dp/B00NAY3RB2/
$7.49 with prime shipping.

OR 4 for $12.50 and prime shipping.

 https://smile.amazon.com/Microchip-MCP3008-I-10-Bit-ADC-Pack/dp/B01HGCSGXM/


And there is an Adafruit tutorial for the MCP3008

https://learn.adafruit.com/reading-a-analog-in-and-controlling-audio-volume-with-the-raspberry-pi
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