The latest is the TTGO T-Call, an ESP32 breakout board that also has a cellular modem. Yes, it’s only a 2G modem, but that still works in a lot of places, and the whole thing is $15. On board ...
The custom PCB plays host to the essentials — an ESP32-S microcontroller ... During testing, a pair of 18650 cells kept the electronics running for an impressive 22 hours.
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