Indoor Air Quality (IAQ) node built on Pycom LoPy4 hardware, running MicroPython.
The node is designed to be always on. The data is sent to a gateway over the LoRaWAN network. The code was tested by connecting the node to a private LoRa network (self-deployed with RAK-Wireless RAK7258 and RAK7268 gateways).
- Pycom LoPy4 (Espressif ESP32-based and MicroPython enabled development board)
- Sensirion SCD30. NDIR CO₂ gas sensor.
- Sensirion SPS30. Particulate matter (PM) sensor measuring PM1.0, PM2.5, PM4 and PM10.
- Sensirion SGP30. Multi-gas (VOC and CO₂eq) sensor. The Adafruit SGP30 Air Quality Sensor Breakout was used in this project.
| Device | Address |
|---|---|
| SCD30 | 0x61 |
| SPS30 | 0x69 |
| SGP30 | 0x58 |
- Rename config_sample.py to config.py.
- Configure the LoRaWAN gateway by registering the device with its EUI.
- Edit settings in config.py.
- Upload the project to the LoPy4 board.
The payload is sent over LoRa with the format specified below:
| Position | Parameter | Format | Bytes | Scale |
|---|---|---|---|---|
| 1 | Temperature | int16 | 2 | 100 |
| 2 | Humidity | int16 | 2 | 100 |
| 3 | CO₂ | float | 4 | 1 |
| 4 | tVOC | float | 4 | 1 |
| 5 | eCO₂ | float | 4 | 1 |
| 6 | PM1 | int16 | 2 | 10 |
| 7 | PM2.5 | int16 | 2 | 10 |
| 8 | PM4.0 | int16 | 2 | 10 |
| 9 | PM10 | int16 | 2 | 10 |
The node is able to process the following incoming commands:
| Index | Description | Format | Data |
|---|---|---|---|
| 0x11 | Reboot | ||
| 0x12 | Set measurement interval | <int16> | Interval (seconds) |
| 0x13 | Set SGP30 baselines | <int16><int16> | eCO2, tVOC |