kevin
325bc2b2c4
DIY Meshtastic node using an Ebyte nRF52840 MCU module with LFXO crystal and E22-400M33S LoRa module (SX1268, 433MHz, 33dBm). Pin assignments: - LED (LED_PAIRING): P0.15, LED_LORA DIO1: P1.10, BUSY: P0.28 (AIN4) - LORA_CS: P0.17, RESET: P1.13, RXEN: P1.09, SPI: P0.20/P0.22/P1.00 - VBAT_ADC: P0.03 (0.5 divider), CHAG_DET: P0.13, BUZZER: P1.11 - BUTTON: P0.24, I2C: SDA=P0.08/SCL=P0.04 (wired, no devices) PA parameters derived from E22-M UserManual V1.2 power curve (not from E22-900M33S which uses a different PA with 25dB gain): - SX126X_MAX_POWER=21, TX_GAIN_LORA=12 (chip 21dBm -> module ~33.5dBm) - DIO2_AS_RF_SWITCH with MCU-controlled RXEN, TCXO 1.8V (TCXO_OPTIONAL) USB CDC serial enabled by default (nRF52840 built-in). No GPS/screen/ I2C devices. Uses S140 v6 SoftDevice (matches nice!nano bootloader). Flashable via USB (1200bps touch DFU) or UF2 drag-and-drop.
Meshtastic Firmware
Overview
This repository contains the official device firmware for Meshtastic, an open-source LoRa mesh networking project designed for long-range, low-power communication without relying on internet or cellular infrastructure. The firmware supports various hardware platforms, including ESP32, nRF52, RP2040/RP2350, and Linux-based devices.
Meshtastic enables text messaging, location sharing, and telemetry over a decentralized mesh network, making it ideal for outdoor adventures, emergency preparedness, and remote operations.
Get Started
- 🔧 Building Instructions - Learn how to compile the firmware from source.
- ⚡ Flashing Instructions - Install or update the firmware on your device.
Join our community and help improve Meshtastic! 🚀
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