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ESP

ESP32

These $10 ESP32 modules from various aliexpress sellers (one example) have a SSD1306 128x64 white OLED display and a SX1278 LoRa radio module. They also include a LiPo battery charger and two buttons (one is wired to reset, so it isn't as useful). There is a slightly more expensive version with a blue OLED with a 900 Mhz radio.

It is programmable with the normal ESP32 Arduino IDE, using the board type ESP32 Dev Module and programmable over the /dev/ttyUSB0 port. On OSX and Windows you might need to install a driver for the CP2102 USB to UART bridge from Silicon Labs.

Source and demos for using them are in github.com/osresearch/esp32-ttgo

ESP8266

The ESP8266 is the older version and not quite as powerful. They can run for several hours on a coin cell.


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Last update: November 8, 2020