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This PCB integrates a Heltec HT-CT62 (ESP32-C3 + SX1262), a TI BQ25628E wide-range Li-ion charger and a TI TPS631000 buck-boost converter providing a stable 3.3V rail at up to 1.5A. The TI BQ25628E is capable of handling highly dynamic sources like solar cells and wind generators.
You can see this project as a successor of the SolarMeshtasticNode project which was a reliable work horse - but showed several limitations. Improvements:
The size of the PCB is 60mm x 51mm and is planned (= screw hole fits into housing) around following Box (120x90x70).
Do not use the transparent version: it will heat up.
Simulation of the EdgeCut with a 1:1 print
✅ Charging IC charges LiPo and blinks LED according to status
✅ Buck-Boost DCDC creates 3.3V
✅ Heating the thermistor forces throtteling of charging current
✅ Reset IC disables 3.3V using EN pin from DCDC if VBat falls below 3.2V
I also do a lot of data gathering into TSDBs via Wifi. The Espressif has the most comfortable stack for doing this.
The Semtech SX1262 consumes a significant number of GPIOs.
Available pins If LoRa is being used: GPIO0, GPIO1, GPIO18, GPIO19, GPIO20, GPIO21
Note that GPIO8 and GPIO9 are strapping pins and are sampled during early boot.
If the SX1262 is not used, it can be disabled via its CS line (GPIO8) from application code.
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