Open-source air quality monitor for India. Affordable (₹5,000), accurate (±10%), portable. Uses PMS5003 sensor + ESP32-C3 with auto-calibration against government CPCB stations. No app needed — just plug in and read AQI on display. Fully open: hardware, firmware, enclosure STLs.
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Sun, 18 Jan 2026 12:00:03 UTC
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Asutosh Rath
github.com/61-Keys/vaayu
github.com/61-Keys/vaayu