4 ms·
A PM sensor is 2-3 times cheaper than a decent CO₂ sensor if you're willing to get your hands dirty. Look for PMS5003 (or PMS7003 which is pretty much the same
by 5e92cb50239222b 5y ago
A PM sensor is 2-3 times cheaper than a decent CO₂ sensor if you're willing to get your hands dirty. Look for PMS5003 (or PMS7003 which is pretty much the same beast in a different package), and any ESP32 dev board (they're dirt cheap) + ESPHome as firmware.