Electronics

Circut Design

Main Circut Click on the image to make it bigger

Sense HAT
Use jumper cables to connect from senseHAT to Raspberry Pi

https://pinout.xyz/pinout/sense_hat

MOSFET Switch

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Assembly

Cutting Holes in a coolerbox

Tip: Heat up the blade you're cutting with. It makes the cutting easier.
You can cut the holes wherever you desire. First we cut holes for peltiers.


If mistakes are made in cutting you can use silicon to fix them.

Hole for the senseHAT shield

Fan hole

This is on the cover of the cooler

Peltier

We are gonna use nailing plates.
We put Peltier element between two nailing boards and put termopasta on both sides of Peltier. Then put the heatsink on the plate. Then use angle brackets and a nailing plate to fix the position of the heatsink.

Do the same actions for the both Peltier elements.
You can use wago connectors to connect the different elements to the Peltier like resistors or solder them together.

Raspberry Pi - pin connections

You have to make yourself a ground pin header since Raspberry Pi does not have enough ground pins. Follow the pin layout for sense HAT. Additionally, add jumper cables to following pins.

• BCM 17 - Heating Peltier
• BCM 27 - Cold Peltier
• BCM 22 - Fan Should look like this.
  
  Then connect the required jumper cables to their respective counterparts on sense HAT.

MOSFET Switches

Fan Switch

Cut off the male part of the jumper cable. Attach it to the respective place on the switch.
For the 5V voltage, use Raspberry Pi 5V pin.

Peltier switches

Connect the Control signal ground to ground header and signal to the respective pin at RPI. Then connect the power source (+ and -) to DC+ and DC-. Connect the peltier Positive and Ground to Out+ and Out- . When MOSFET is on the led indicator will turn on.

Final Product

You can use Tie Mounts to do some sort of cable management.