This project is hobby/amateur/toy/educational radio ESP32 based LoRa/FSK Codec2/OPUS DV handheld trasceiver a.k.a. walkie-talkie, which is using 1W E22-400M30S ...
The first portion of their paper uses a UHF RFID reader to transmit to the sensor’s four stage charge pump. They added a supercap to provide enough power for 24 hours of logging while the node ...