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kevin
2026-07-31 11:08:59 +08:00
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variants/esp32c3/diy/moonshine_ESP_C3/readme.md
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# Moonshine ESP-C3
DIY Meshtastic node variant based on the ESP32-C3 + E22-400M33S LoRa module.
DIY Meshtastic node variant based on the ESP32-C3 + EBYTE 433 MHz LoRa module.
## Hardware
- **MCU**: ESP32-C3 with 4 MB external SPI flash
- **LoRa**: E22-400M33S (SX1268 + 33 dBm PA, 2 W, 433 MHz)
- **LoRa**: one of three EBYTE 433 MHz modules (see [LoRa module selection](#lora-module-selection))
- **USB CDC**: enabled (`ARDUINO_USB_MODE=1`, `ARDUINO_USB_CDC_ON_BOOT=1`) -
serial console is exposed via the USB CDC port, no separate UART chip
- **Battery ADC**: 0.5 voltage divider on GPIO1 (`ADC_MULTIPLIER = 2.0`)
- **No screen, no GPS** on this board
### E22-400M33S power note
## LoRa module selection
The E22-400M33S is a 33 dBm / 2 W module with ~25 dB PA gain. This variant
uses the firmware's default SX126x output power (22 dBm), which the E22's PA
amplifies to ~47 dBm. **This will overdrive the PA, cause large current spikes,
and may reset the system** at higher `tx_power` settings.
For safe operation on the E22-400M33S, add the following to `variant.h`:
This board supports three EBYTE 433 MHz LoRa modules. Select the module by
commenting/uncommenting the `#define` lines at the top of `variant.h`:
```cpp
#define SX126X_MAX_POWER 8 // SX1268 outputs 8 dBm -> PA -> ~33 dBm
#define TX_GAIN_LORA 25 // PA gain compensation
#define E220_400M30S
//#define E220_400M33S
//#define E22_400M33S
```
These are intentionally omitted here per the board designer's request; the
operator is responsible for setting an appropriate `tx_power` in app config
or patching the variant before flashing. See
`variants/nrf52840/diy/moonshine_NRF52/variant.h` for the same module wired
with the PA-safe power profile.
Only one module should be enabled at a time.
| Module | Chip | Power | `USE_*` | `TX_GAIN_LORA` | `SX126X_MAX_POWER` | Total output |
| ------------ | ------ | ------------ | ------------ | -------------- | ------------------ | --------------- |
| E220-400M30S | LLCC68 | 30 dBm (1 W) | `USE_LLCC68` | 8 | 22 | 22 + 8 = 30 dBm |
| E220-400M33S | LLCC68 | 33 dBm (2 W) | `USE_LLCC68` | 11 | 22 | 22 + 11 = 33 dBm |
| E22-400M33S | SX1268 | 33 dBm (2 W) | `USE_SX1268` | 25 | 8 | 8 + 25 = 33 dBm |
### E22-400M33S power note
The E22-400M33S has a high-gain PA (~25 dB). The variant limits the SX1268
chip output to 8 dBm (`SX126X_MAX_POWER = 8`), which the PA amplifies to
~33 dBm. Do **not** raise `SX126X_MAX_POWER` above 8 without verifying
actual PA output and current draw - overdriving the PA can cause large
current spikes and system resets.
See `variants/nrf52840/diy/moonshine_NRF52/variant.h` for the same module
wired with a more conservative power profile (`SX126X_MAX_POWER = 2`,
~27 dBm output).
## Pin map
@@ -47,7 +58,7 @@ with the PA-safe power profile.
| LORA_CS | 8 | |
| LORA_SCK | 10 | |
DIO2 drives the E22's TXEN pin internally (`SX126X_DIO2_AS_RF_SWITCH`), so
DIO2 drives the module's TXEN pin internally (`SX126X_DIO2_AS_RF_SWITCH`), so
`SX126X_TXEN` is left as `RADIOLIB_NC`. `SX126X_RXEN` is driven by GPIO2.
## Build & Flash