What happens when you open your refigerator door? Does it warm up significantly? I spent an entire weekend trying to figure this out so you don't have to.
Arduino Code Needs a couple libraries (most are not built-in into Arduino IDE:
#include <SD.h> Arduino_SD_card_Datalogger_DHT22__PhotoS[...] Compressed archive in ZIP format [2.5 KB]
If you want a PCB let me know. If there is enough interest I will get a few made.
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