To start with

At this point we started to assemble the temerature logger. We need to place that in a normal "frost free fridge" refrigerator and monitor the temperature to understand how wormer it gets during the "defrost". Initial thought was to use an Arduino Nano with a temperature sensor which can read the temperature however there is no memory storage. So the new design will use an ESP32 controller board that can read a memory stick. That way we could read the temperture let's say everyminute and plot it. We expect thatwhile the normal temp is about -20 Celsius it will increase to maybe 10 Cesius. The other challenge is to power the temperature logger as we cannot run cables from outside without corruptin the measurements. Maybe we could use a phone power bank that can be placed in the refrigerator.