Arduino PCR (thermal cycler) for under $85

Step 7: The Circuit- thermocouple and MAX31855 breakout

There's an awesome tutorial on how to set up the thermocouple and the breakout. Our project pretty much just followed it exactly, so the connections are:

Arduino pin 4 -> DO pin on the MAX31855 breakout
Arduino pin 5 -> CS pin on the MAX31855 breakout
Arduino pin 6 -> CLK pin on the MAX31855 breakout
Arduino GND & VCC -> to GND and VCC on the MAX31855 breakout

The thermocouple screws into the breakout board (yellow wire to the +).