Calibrating a low-cost particle sensor with machine learning
An internet-connected Plantower PMS 5003 sensor at Calgary Varsity was compared with a government-approved SHARP monitor. The sensor overestimated readings before calibration, likely because of changing ambient humidity, so we calibrated it with machine-learning methods, including a neural network and gradient boosting.
- Correlation with the reference monitor before calibration
- 0.78
- RMSE before calibration, and after the neural network
- 9.93 → 3.91
- Reading interval, streamed to cloud storage
- 6 s
- Fine particles, plus temperature and humidity
- PM2.5
