For prototyping, we set up the various electrical components of our PCR on a breadboard controlled by an Arduino Uno.
We set up the thermocouple and screen using the tutorial provided here: https://learn.adafruit.com/thermocouple for the thermocouple and here https://learn.adafruit.com/nokia-5110-3310-monochrome-lcd for the screen.
We also set up the power supply, relays, and fan. The power supply is connected to the relays to control the peltier. It is also connected to the fan to power it. The relays are controlled by the arduino in response to the block temperature. We set up the relays to switch the peltier from heating to cooling at defined intervals, not through temperature sensing at this time, just to test if it works.