All firmware configuration lives in firmware/node/include/config.h. This page provides a complete reference for every setting.
| Constant | Value | Description |
|---|
NODE_RECEIVER | 0 | Listens for all packets, forwards to USB serial. Never relays. |
NODE_TEMPERATURE | 1 | Reads TMP102, transmits reports, relays other nodes’ packets. |
NODE_PRESSURE | 2 | Reads BMP280, transmits reports, relays other nodes’ packets. |
Set the active node type with:
#define NODE_TYPE NODE_RECEIVER
All nodes in a network must use identical radio settings.
| Constant | Default | Type | Description |
|---|
LORA_FREQUENCY | 902.25 | float | Center frequency in MHz. 902.25 for US, 868.0 for EU. |
LORA_BANDWIDTH | 500.0 | float | Bandwidth in kHz. Options: 7.8, 10.4, 15.6, 20.8, 31.25, 41.7, 62.5, 125.0, 250.0, 500.0. |
LORA_SPREADING_FACTOR | 7 | int | Spreading factor. Range: 7-12. Higher = longer range, slower. |
LORA_CODING_RATE | 5 | int | Denominator of the coding rate fraction (4/x). Range: 5-8. Higher = more error correction. |
LORA_SYNC_WORD | 0x34 | hex | Network identifier. Only nodes with matching sync words communicate. |
LORA_TX_POWER | 21 | int | Transmit power in dBm. Range: -9 to 22 for SX1262. |
| Constant | Default | Unit | Description |
|---|
REPORT_INTERVAL_MS | 5000 | ms | Interval between sensor readings and transmissions. |
PEER_TIMEOUT_MS | 15000 | ms | Receiver marks a node as offline after this duration of silence. |
PEER_PRUNE_INTERVAL_MS | 5000 | ms | How often the receiver scans for stale peers. |
DISPLAY_UPDATE_MS | 1000 | ms | OLED display refresh interval. |
| Constant | Default | Description |
|---|
MESH_MAX_HOPS | 3 | Maximum relay hops before a packet is dropped (TTL). |
MESH_SEEN_TABLE_SIZE | 32 | Ring buffer size for deduplication. Oldest entries are overwritten. |
MESH_RELAY_JITTER_MS | 200 | Maximum random delay (ms) before relaying to prevent collisions. |
| Constant | Default | Description |
|---|
TMP102_ADDRESS | 0x48 | I2C address of the TMP102 sensor. Change to 0x49 if ADD0 is tied to VCC. |
BMP280_ADDRESS | 0x76 | I2C address of the BMP280 sensor. Change to 0x77 if SDO is tied to VCC. |
See the Pin Map page for the complete pin assignment table. These should not need to be changed unless you are using a different board.
