MCP3008 12-bit ADC Tester

8-channel 12-bit SPI ADC reading a potentiometer, an LDR, and a thermistor in real time.

Difficulty: Through-hole. Estimated build time: about 45 minutes. Estimated parts cost: about US$5.50. 6-part bill of materials with live supplier pricing. A bench tool that turns a generic Arduino or Raspberry Pi into an 8-channel 12-bit data acquisition front-end.