C3MA/DD3-LoRa-Bridge-MultiSender
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Document 433/868 MHz variants

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acidburns
2026-01-21 21:20:05 +01:00
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README.md
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@@ -3,7 +3,10 @@
Unified firmware for LilyGO T3 v1.6.1 (ESP32 + SX1276 + SSD1306) that runs as **Sender** or **Receiver** based on a GPIO jumper. Senders read DD3 smart meter values, compress JSON, and transmit over LoRa. The receiver validates packets, publishes to MQTT, provides a web UI, and shows per-sender status on the OLED. Unified firmware for LilyGO T3 v1.6.1 (ESP32 + SX1276 + SSD1306) that runs as **Sender** or **Receiver** based on a GPIO jumper. Senders read DD3 smart meter values, compress JSON, and transmit over LoRa. The receiver validates packets, publishes to MQTT, provides a web UI, and shows per-sender status on the OLED.
## Hardware ## Hardware
Board: **LilyGO T3 LoRa32 v1.6.1** (ESP32 + SX1276 433 MHz + SSD1306 128x64 + LiPo) Board: **LilyGO T3 LoRa32 v1.6.1** (ESP32 + SX1276 + SSD1306 128x64 + LiPo)
Variants:
- SX1276 **433 MHz** module (default build)
- SX1276 **868 MHz** module (use 868 build environments)
### Pin Mapping ### Pin Mapping
- LoRa (SX1276) - LoRa (SX1276)
@@ -157,7 +160,8 @@ Packet layout:
``` ```
LoRa radio settings: LoRa radio settings:
- 433 MHz, SF12, BW 125 kHz, CR 4/5, CRC on, Sync Word 0x34 - Frequency: **433 MHz** or **868 MHz** (set by build env via `LORA_FREQUENCY_HZ`)
- SF12, BW 125 kHz, CR 4/5, CRC on, Sync Word 0x34
## Data Format ## Data Format
JSON payload (sender + MQTT): JSON payload (sender + MQTT):
@@ -269,3 +273,15 @@ Test mode:
pio run -e lilygo-t3-v1-6-1-test -t upload --upload-port COMx pio run -e lilygo-t3-v1-6-1-test -t upload --upload-port COMx
``` ```
868 MHz builds:
```bash
pio run -e lilygo-t3-v1-6-1-868 -t upload --upload-port COMx
```
868 MHz test mode:
```bash
pio run -e lilygo-t3-v1-6-1-868-test -t upload --upload-port COMx
```