$19 Button Size Node 3 is an Arduino Pro-mini board with on-board LoRa

https://www.electronics-lab.com/19-button-size-node-3-is-an-arduino-pro-mini-board-with-on-board-lora/

Electronic enthusiast and hobbyist, Koresh, has designed an Arduino IDE compatible microcontroller for home automation and IoT, called the Button Size Node 3. Button Size Node 3 is a low-cost wireless Arduino Pro-mini board with on-board LoRa RFM 95 or RFM 69 HW(CW) radio, external EPROM flash, crypto authentication chip, a light sensor, and a […]