4 ms·
You could do this today without any sort of "smart" appliance for about $1.00, $50 if you are being lazy. Just get a super simple micro-controller and radio on
by Junk_Collector 7y ago
You could do this today without any sort of "smart" appliance for about $1.00, $50 if you are being lazy. Just get a super simple micro-controller and radio on a board and throw it into your fridge. Have it record the temperature at a regular interval into a ring buffer and poll it periodically from a chron script. Get your power from the light switch in the fridge door. Alternatively, a Li-po or Li-ion battery can last an extremely lond time powering a little micro in a refrigerator. If you put a $0.02 photo diode on it, you could also track how often the door is open.
If you went the full on $50 route and bought a pre-integrated board with wifi and a full linux stack, you could even have a push notification to twitter or email or whatever when the temperature goes out of spec.
- kakwa_ 7y agoOr even simpler, put a cheap analog thermometer which records the min and max temperature in your fridge. Maybe not exactly this one, but something like that: https://images-na.ssl-images-amazon.com/images/I/61jmAUQ70pL._SL1024_.jpg https://images-na.ssl-images-amazon.com/images/I/61jmAUQ70pL...
- roland35 7y agoI bought a digital thermometer with min/max from Walmart for $5, but the problem was the temperature would rise quite a bit (above 40F) if the door was left open even for ~10-30 seconds, so it was hard to use the "max" temperature reading. It would have been more handy if the thermometer's min and max responded more slowly to reject these short fluctuations.
- perl4ever 7y agoYou could put it in something with substantial thermal mass as a buffer.