PAQM - Portable Air Quality Meter

PAQM is a portable device to mesure the air quality.
Breathe the fresh air !

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The air we breathe, indoor or outdoor, is not necessarily clean and unpolluted. Polluted air can affect your health, especially the most sensitive and vulnerable. Air quality therefore appears today to be a major public health issue. But beyond the health issue, air quality also faces environmental and financial challenges.

According to the latest estimation published by "Santé Publique France", PM2.5 fine particle pollution is responsible for 48,000 deaths per year. This obviously has a significant cost in terms of public health.

PAQM is a small device that informs you in real time of the pollution around you. Allowing you to take the necessary measures for your protection.

V  This is a well advanced project which will be released soon in open-source.

> What does it detect ?

  • Precise calculation of ambient air temperature outside the device
  • Precise calculation of ambient relative humidity outside the device
  • Precise calculation of pressure outside the device 
  • Precise calculation of air quality (IAQ) level outside the device,
  • Precise calculation of particles in the air,
  • Smoke detection.

> What are common applications ?

  • Dehydration / heat stroke monitoring,
  • Control VOC emission from 3D printer,
  • Particles emission from 3D printer,
  • Smoke emission,
  • Control heating, venting, air conditioning (HVAC) applications,
  • Control Air Quality inside a room (When you do some house work like painting, air brush paint, ...).

> How it works ?

PAQM has 2 sensors linked by an ESP32 on which a powerful analysis algorithm works.

It can detect in realtime the presence of VOC, and particle in the air around you. PAQM has a battery and you can freelly move to analyse your close environnement.

internal ventilation allows air to be drawn in for analysis.

>  General tech data :

  • Fully 3D PLA printed case,
  • Total weight:  less than 400g,
  • Low power oled screen,
  • on/off button,
  • Operationnal in less than 5 minutes.

> Power supply:

  • Rechargeable li-ion 1200 mAh,
  • TP4056 - li-ion rechargeable module,
  • DC/DC stepup MT3608 from 3.7 to 5V.

> Sensors :

  • Bosh BME680 : IAQ Sensor,
  • Sharp GP2Y1010AU0F : PM 2.5 particle sensor.

> Microcontroler:

  • Espressif ESP32

> IHM:

  • oled 0.96" screen,

> Other:

  • 4010 DC 5V fan,

> Data record & management:

  • Bluetooth,
  • Wifi,

  • 1 × Espressif ESP32 Devkit C board
  • 1 × 0.96" oled screen i2c screen
  • 1 × 1 Led
  • 3 × 1N4007 a diode
  • 1 × 2 Pins terminal

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  • 4.10.2020 - updated interface

    nj133710/04/2020 at 20:25 0 comments

    Today, i've updated the interface with the Nextion UI :

    The starting screen

    Heating sensors screen

    Main screen

  • 23.09.2020 - Changing display

    nj133709/23/2020 at 13:30 0 comments

    I've buyed from china a new screen. A 2.4" Nextion smart screen. (

    This screen is really fantastic. It comes with an ide, and comunicate via the serial bus with the esp32. it grab the data and do a fantastic job.

    You can add button and other things for a modern UI.

    thank you =)

  • 30.08.2020 - mounting all togather

    nj133708/30/2020 at 00:21 0 comments

    Then, the first part of the assembly is to screw the main PCB plate into the case that I printed this morning.

    Then, you have to put double-sided tape to stick the battery. Hot glue will work too.

    Then, we connect the elements one by one to check that everything works well.

    and we can mount the next stage of components : 

    I will have tomorrow to design the upper part of the case with an air flow management system.

    Thank you for follwing this project.

  • 29.08.2020 - PLA Case & pcb

    nj133708/29/2020 at 00:42 0 comments

    Here are somes all of the electronics components : 

    This is the power management with a DCDC booster from 3.7V to 5V, the 1200 li-ion battery and the TP4056 for chargement the battery. note that there is a battery monitoring system directly on the ESP32 from the TP4056 OUT terminal.

    This is the ventilation system, with a 5V fan (lowered to 4V for a slow speed). and his control PCB.

    This is the main board with the ESP32 DevkitC. There is a led for power indication.

    This is the other face of the main board. Note that i have engraved it with my CNC and flatcam. there a protection varnish.

    Here are the sensors and the Oled control screen.

    Thank you. Leave a comment =)

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