This page on Adafruit mentions how to use a MCP3008:
It is in Python however.
This library makes the MCP3008 work with Arduino but I bet it could be ported to work with Particle on Raspberry Pi:
You would likely have to wire it up like this:
- MCP3008 VDD to Raspberry Pi 3.3V
- MCP3008 VREF to Raspberry Pi 3.3V
- MCP3008 AGND to Raspberry Pi GND
- MCP3008 DGND to Raspberry Pi GND
- MCP3008 CLK to Raspberry Pi SCLK
- MCP3008 DOUT to Raspberry Pi MISO
- MCP3008 DIN to Raspberry Pi MOSI
- MCP3008 CS/SHDN to Raspberry Pi CE0
