Air quality monitor (MQ 5/7/135 based)
An ESP8266 mini based air quality monitor.
Please note that this should never be used to replace a proper CO monitor and should be used for informational purposes only.
Parts:
- Wemos D1 mini (amazon.com)
- MQ 5 sensor
- MQ 7 sensor
- MQ 135 sensor
- ADS1115 ADC Analog to Digital Converter (amazon.com)
- M2.5 brass inserts (amazon.com)
- M2.5 screws and nuts (amazon.com)
- Hook up wire
- Heat shrink
Links
- 3D Design/.stl files: Printables
- ESPHome .yaml config: thatguy-za/esphome-esp8266-airqualitymonitor Note: you’ll need to calibrate the sensors.
Print settings
- Printer: Creality Ender 3v2 Neo
- Filament: Creality PLA – Grey
- Bed temperature: 60’c
- Nozzle temperature: 200’c
- Infill: 20%
Build/installation guide
Step 1 – Once printed, insert the 14 x M2.5 brass insert nuts
Step 2 – Use M2.5 screws to mount the MQ 5/7/135 sensors, analog to digital converter and Wemos D1 mini.
Step 3 – Solder everything together.
Step 4 – Print the lid and pop it on. Connect the Wemos D1 mini to your computer via USB so you can upload your firmware. I used ESPHome.
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