|1||30A Current Sensor Module ACS712||$2|
|1||SMP60N06-14 SILICONIX N-CHANNEL||$1|
|1||FT232RL 3.3V 5.5V FTDI USB to TTL Serial Adapter Module||$5|
|1||Atmega328P Pro Mini Board||$5|
|2||TMP36 TMP36GT9Z Low Voltage Temperature Sensor||$2|
|1||6mm x 30mm F10AL250V FUSES 10A 250V||$1|
|1||AGC In Line Fuse Holder Screw Type fit 6x30mm||$1|
|1||MAX7219 8-Digit 7 Segment Red Digital LED Display||$6|
|3||Old salvaged CPU heat sinks||Free|
3D Printed Parts
|1||Part for mounting CPU heat sinks to make contact with cup.||cupConnectorRev12.stl.zip|
This project was doomed from the start but it was a good opportunity to experiment with Peltier plates, switching power with a FET, current sensors, temperature sensors, etc. The major flaws are listed below:
- A very small contact zone between the cup and the cold side of the Peltier which makes for poor conduction.
- Trying to cool a pint of water by cooling a small section of a metal cup. Since the water is not circulating and the contact patch is small, only water that is local to the patch would be cooled.
- Terrible efficiency of Peltier. For similar input power a conventional refrigerator work be much more effective. To maintain efficiency the warm side must be cooled.