SPI on the PHOTON, Confused

[rabenja]

Photon controlling 5V output using MCP4151 POT and Photon SPI API

[Edit… I figured this out and solution is below] I am attempting to control voltage 0-5V using a 4151 POT using SPI on the Photon. My physical connections are: (4151-Photon) CC - D5 CK - D4 SDI - D2 VSS - GND VDD - 5 V P0B - GND P0W - (output voltage/test) P0A - 5 V Just to test I have this code in setup() (set voltage to 0 in this case): SPI1.setBitOrder(MSBFIRST); SPI1.setClockSpeed(10,MHZ); SPI1.setDataMode(SPI_MODE0); SPI1.begin(); digitalWrite(D5, LOW); SPI1.transfer(0x00); I …