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Mq135 Air quality limits

maos last edited by

Hello, I'm new here.
I'm using mq135 with arduino, to measure the quality of the air inside.
I have had readings between 45 and 150.
What are the limits? For example :
0-50, good
51-100, regular
101-199, it's not good
200-299, very bad
300-399, terrible

400, critic

Is this table correct?
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@andriej Hi, I had problem using the main branch mysensors/Raspberry, that because of the bit-field struct (header_s) in Sensor.h They will get packed in different order on the arduino compared to the RPi (at least with my compiler, gcc). In order to fix this I created the 1.4dev branch. It uses full bytes instead of the bit-fields, but you need (of cause) to compile both the sensors (arduino) and the gateway (RPi) using the 1.4dev branch. We need to fix this in the main branch later on (and use the same files as in mysensors/Arduino/libraries/MySensors)
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hey @dirkc, maybe you can trigger your interrupt to rising and falling edge and use millis() to see how long the press was?
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General Discussion • • dbemowsk

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@OldSurferDude My old 2.0 setup is with nRF24L01 radios. This is a link to the thread on some light switches that I designed and built. https://forum.mysensors.org/topic/7376/us-decora-wall-switch-continued/2 I am aware that you cannot have two MQTT gatways. When I designed my old setup I was not that familiar with MQTT so I never ended up implementing it. On the home assistant server that I have set up though, I have installed the MQTT broker on there so I should be able to comunicate with any MySensors stuff over MQTT in the future devices I make/set up. As I mentioned, I do have a Home Assistant box that I have started about 4 months ago and eventually want to migrate my Vera equipment to the HA box. As for the YAML and Python, I'll muddle my way through. used to program in PHP and have done enough on Arduino that I'm sure it won't hurt my brain too much.
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General Discussion • • mimaret

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@mimaret It was a pleasure. Thank you for your feedback!
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General Discussion • • kiesel

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For me almost all I need is in Master. For some nice to haves I have some custom libraries, like a message and a presentation queue. The only wish I have is dual led support.
Anybody got one / a few spare minimalist rfm69hw shields for wemos d1 mini?
General Discussion • • kiesel

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Thanks for the offer @TheoL ! I have moved on to a differenct project. Also, a lesson that I have learned many times, "If it works, don't fix it!" -OSD

Mq135 Air quality limits

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Mq135 Air quality limits

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Update RF24 library to latest version Bug Reports • • andriej

single-click, double-click, long-press button possible with MySensors? General Discussion • • dirkc

Old hardware migration General Discussion • • dbemowsk

Gateway on Raspberry pi 1 General Discussion • • mimaret

No merge into master in the last 5 years, should we use development? General Discussion • • kiesel

Anybody got one / a few spare minimalist rfm69hw shields for wemos d1 mini? General Discussion • • kiesel

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Update RF24 library to latest version
Bug Reports • • andriej

single-click, double-click, long-press button possible with MySensors?
General Discussion • • dirkc

Old hardware migration
General Discussion • • dbemowsk

Gateway on Raspberry pi 1
General Discussion • • mimaret

No merge into master in the last 5 years, should we use development?
General Discussion • • kiesel

Anybody got one / a few spare minimalist rfm69hw shields for wemos d1 mini?
General Discussion • • kiesel

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