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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 12-04-2021, 04:55 PM   #1
littlebigman
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Question DIY CO2 monitor?


Hello,

I'd like to assemble a CO2 monitor with the following features:
  • < €$50 (Aranet is nice, but €200 is a bit over budget)
  • NDIR sensor, as they're more reliable than COV
  • LCD display
  • ready-to-use box, not 3D-printed
  • Handheld so I can take it with me (powered by either a regular, rechargeable battery, or a small USB powerbank)

As there are different sensors and boards available and I know nothing about that field… if you've already built one, what would you recommend?

Thank you.
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Old 12-04-2021, 07:49 PM   #2
frankbell
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A web search for "do it yourself co2 monitor linux" turned up this how-to: https://www.reichelt.com/magazin/en/...suring-device/

I have no personal experience with such an endeavor.

Last edited by frankbell; 12-04-2021 at 07:51 PM.
 
Old 12-06-2021, 07:46 AM   #3
littlebigman
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Thank you.
 
Old 12-06-2021, 12:00 PM   #4
Turbocapitalist
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Keep in mind that many (all?) of these sensors are 5 V and many boards are 3.3 V these days but might have inputs which are 5V safe. The Raspberry Pi is 3.3V, and I think that includes the Raspberry Pi Pico is too. Also note which models of sensor are analog and which are digital.

The ESP32 mentioned in the Reichelt link there has more than a few varieties, some with bluetooth and wifi and others without. They are low power and you can get a Lithium Iron Phosphate (LiFePO4) battery for it, but you probably won't be able to use a regular mobile phone power bank for it. The ESP32 draws so little power that the power bank will shut itself off. As for the LiFePO4 batteries, there are charger boards which can be attached between the battery and the ESP32, since the reality is far more complex than just connecting wires to a battery.

You may have to 3D print a case. There are mail order options for that and some libraries and Maker Spaces might be found locally.

If you're looking for an almost ready kit, the MagTag from Adafruit has a built-in e-paper display, built-in buttons, a built-in buzzer, an accelerometer, four NeoPixels, and a built-in Lithium Polymer (LiPo) battery adapter / charger. It can be programmed either the usual way or with CircuitPython. Keep in mind that LiPo are the same kind as in mobile phones and therefore will explode and catch fire from many situations.

If you do find something, please post about it!

Edit: About the question of CO2 sensors, here is one: https://www.olimex.com/Products/Components/Sensors/Gas/

Last edited by Turbocapitalist; 12-06-2021 at 12:10 PM.
 
Old 12-12-2021, 04:44 PM   #5
littlebigman
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Thanks very much.

--
Edit: From what I gather, it appears that the simplest, cheapest, most compact solution is to get a LILYGO TTGO microcontroller that sports an ESP32 chip and an LCD OLED display… but not enough oomph to run Linux — it runs the real-time FreeRTOS — and a Senseair S8 LP CO2 sensor (Winsens's MH-Z19B sensor is cheaper, but fakes abound on Chinese sites.)

https://emariete.com/en/meter-co2-di...irion-scd30-2/

Last edited by littlebigman; 12-14-2021 at 03:09 AM.
 
  


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