Tweaking a small frigobar I use (mostly for pepsi and some ham) I broke the thermistor. Unable to find a replacement I had to use an arduino to digitally control the activity of the pump.
Now the temperature is far more precise, and the cola tastes far more delicious. The SD card saves all the events, temperatures and relay activity every 20 secs; this allows me to do data mining over the data, estimate consumption, efficiency, and enhance the cooling process.
Heating:
https://f.cl.ly/items/0L113O3J1c2h0z0H3h3H/graph_resting.png
Cooling down:
https://f.cl.ly/items/010k343D44382L2H3i2b/graph_cooling.png
Sketch:
https://cl.ly/R5by
Post time: Jun-30-2017