The Microchip MCP3008-I/P is a 2.7 volt four channel or 8 channels 10-bit analog to digital converter (ADC) with a simple to use SPI interface.
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 its fun to have analog inputs but the Pi does not have an ADC.