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Temperature sensor
Temperature sensor
I was looking for a temperature sensor to see the fluctuations over a few days or even longer period of time. Found this gem and was so happy that I would like to share it with you. the CR2032 batteries I had laying around were not good, so I started a project to use 18650s. I took a gamble because 3.8V could frie the unit, but even 3.9V during 24h is no problem, there must me a regulator inside. Another big advantage with the modified unit is it's size & weight, it will not get lost easy. The TP4056 allows you to charge the batteries and makes sure the batteries don't get over and under charged.
Items you need
Items you need
The sensor, 2 batteries, TP4056 and a battery holder
file and cutting the holders
file and cutting the holders
and the sensor too.
Sensor
Sensor
Soldering, the bottom is negative, the small clip is positive
TP4056
TP4056
Preparing the 18650 holder and soldering the pads.
double sided tape
double sided tape
Close the unit and solder it to the TP4056. The TP4056 will protect the battery from overcharge.
Done
Done
Install the batteries and you're good. Batteries should last at least one year. I used good batteries with a capacity just below threshold to make it to the powerwall.
Install
Install
Installation is straight forward. The app is called Engbird.
Activate the bluetooth, search the unit et voila...
details
details
Daily, weekly, monthly, all details available. Samples every 5/10 or 30 minutes. Export to CSV too.
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