Step 1: The Parts
- Thermoelectric Cooler ($14.75)
- Power Supply ($4.75)
- Motor ($1.25)
- Magnets x2 ($0.66 total)
- Potentiometer, 5K ($1.00)
- Switches x2 ($2.00 total)
- LED ($0.10)
- Enclosure ($1.95)
Step 2: The Stirrer
Next, complete a circuit with the power supply, switch, and the potentiometer. See the schematic if you have questions.
To mount the setup into the enclosure, use hot glue to secure the motor in the center of the enclosure. Drill holes to mount the switch and the potentiometer.
Place the second magnet set in the liquid to remotely stir it.
Step 3: The Hotplate
To mount the heater/cooler, identify the heating side and place it face up on the metal. Secure the device with a dot of hot glue. Make sure this is centered above the motor you mounted in the last step.