Adafruit MCP3008, 8-Channel 10-Bit ADC With SPI Interface, 856

Need to add analog inputs? This chip will add 8 channels of 10-bit analog input to your microcontroller or microcomputer project. It's super easy to use and uses SPI so only 4 pins are required. We chose this chip as a great accompaniment to the Raspberry Pi computer because it's fun to have analog inputs but the Pi does not have an ADC.

We have a tutorial and code example for wiring this chip to a Raspberry Pi.