Code for a temperature tracker based on ESP32 https://christophhagen.de/projects/electronics/temp-logger/en.html
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TempTrack

This repository contains the code for an ESP32 with temperature sensors attached, as used in this project.

The device records measurements at specified intervals and allows reading them over a Bluetooth connection. It stores the data in RTC memory and wakes itself periodically for measurements. Bluetooth is enabled at the push of a button, to improve energy efficiency.

Hardware example