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This project started under the name FART sensor, which stands for Flow and Return Temperature. I ran it on a breadboard using a XIAO ESP32-C6.
https://youtu.be/hC5STZaQ3CE
Over time, I moved from DS18B20 sensors to NTC probes in an effort to improve accuracy. I switch to the nRF52840 so ensure better battery life. I implemented Zigbee and a kind stranger designed a PCB for the XIAO board.
That proved to a bust, since the battery terminals proved too difficult for me to access (they were on the rear)
In the end, I started learning KiCad and developed my own PCB, using a MinewSemi ME54BS01 nRF54 module.
The board does need a few tweaks and improvements, like fixing the reset button and adding a battery measurement mechanism.
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