This led him to design the Sailor Hat with ESP32 ... them to the GPIO header as needed. Additionally, there’s a generous prototyping area to add additional hardware to the board.

Explore the Super Tiny RP2040/ESP32 board, featuring wireless connectivity, a TFT display, and cross-platform compatibility.

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 ...