The Heltec WiFi LoRa 32 (V4) is an ESP32-S3-based off-grid LoRa/Meshtastic communicator with solar charging, optional GNSS, and a high 28dBm transmit power.
The T-Deck is a compact device with a 2.8-inch IPS LCD touch screen, integrated keyboard, trackball, microphone, and speaker, running on an ESP32-S3 dual-core processor. It supports various frequencies and includes a GPS module and battery in its Plus variant. It features a U.FL/IPEX antenna connector for LoRa and can be flashed using Espressif's firmware download mode.
A review of Meshtastic, a cheap, encrypted, offgrid communicator using T-Beam devices. The review includes both positive and negative aspects of the project.
"This document is aimed at the Arduino developers, radio experimenters, hobbyists and anyone interested in building a receiver based on the Si473X IC family from Silicon Labs. This project is about an Arduino library for the SI473X BROADCAST AM, SSB and FM/RDS RADIO RECEIVERS. Frequency ranges of AM and SSB modes are 150kHz to 30MHz, and FM mode is 64 to 108 MHz."
