* This is Project OAQ an Open source Air Quality Sampler made for Everyone
* Air pollution kills ~7M people every year, and everybody under the living atmosphere of this planet gets affected by it.
* The biggest issue with Air Pollution is a lack of awareness about its constituents, we want to change that.
* Hence, we designed Project OAQ to be a portable, battery powered air pollution monitor, indicating AQI values as well as concentrations of the most influential pollutants.
* idea: make AQI measurement cheap, portable, open, everywhere
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* What exactly is Project OAQ ?
* open source portable AQI sampler
* measures local air quality in real time
built for *accessibility + hackability + actual usage**
* works offline, no cloud dependency
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* Core Tech
* MCU-based compact PCB (52mm × 30mm)
full *through-hole design (no SMD)**
* BLE for data transfer
* 18650 Li-ion powered (portable, rechargeable)
* modular sensor architecture
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* Sensors used inside are
* Temperature + Humidity → DHT22
* Gas sensing → MQ-135 (CO₂/VOC proxy)
* Particulate Matter (user choice)
* ZH03
* PMS5003 / PMS9003
* SPS30
* SDS011
* MPM14
* ZH06
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* AQI Measurement Logic
* calculates sub-index per pollutant
final AQI = *max(sub-indices)**
* uses breakpoint-based linear interpolation
* sensor fusion used for better context
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* Features
* under $25 build cost
* no SMD soldering → easy assembly
* works with multiple PM sensors
* real-time AQI + pollutant values
* buzzer-based alert system (pollution aware UX)
* BLE app (no internet required)
* local data logging (.txt)
* Home Assistant integration ready
* customizable 3D printed enclosure
designed like a *power bank (low attention, EDC friendly)**
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* Firmware
* simple, community-driven
* no OTA yet (planned)
* future: plug-and-play binary support
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* App
* BLE-based communication
* shows AQI + all sensor values
* local logging
* fully offline
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