This is my first Instructable, so please judge harshly so that I can learn 🙂
Its a simple project minimal skills needed.
Drawings are made using: Fritzing
Code Written using Codebender
The cold plate got to -20c
Watter in the cup measured @ 5.5c compared to icecube @2.5c
Step 2: Wiring everything
Optocoupler 4N33
Pin1 – Digital I/O 9 via 220Ohm resistor
Pin2 – Ground
Pin4 – DC fan Positive
Pin5 – 12V positive
DC Fan
Ground – to 12v Ground
LM335 Temp sensor
Vin – 5V arudino
Grn – Ground arduino
Vout – Analog 0
TEC1-12704 TEC
Positive to 12v DC positive
Negative to 12v DC negative
Better would to add a switch or another Optocoupler to turn ON/OFF
Things To Find
list of items i have used:
Arduino uno
Breadboard
220ohm resistor (i have used 3 x750 in parallel as couldn’t find anything smaller) anything from 100 to 220 will do.
12v dc fan 3 wire but 2wire will do the same job.
TEC1-12704 TEC Thermoelectric Cooler
12volt DC adaptor 2.5 amp
Optocoupler 4N33
jumper wires
LM355Z Temperature Sensor
Thermal Past
Glue Gun
For more detail: Cup Cooler using an Arduino
