Air Quality: CO2 Sensor MH-Z14
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@BulldogLowell said:
I am always concerned about the employees exposure to CO buildup, even though we employ a high capacity ventilation system.
I guess you meant CO2 ? ;-) I'm happy people find new use to those sketches, that is the magic of this forum ! The more basic bricks we'll have, the more usefull the use of it will be !
You can also check the Particle mesurement in air with the SamYung, I will extend it to PM1 and PM2.5:
http://forum.mysensors.org/topic/291/dust-sensor-1-4/20 -
The sensor price has dropped a lot during the past years , monitor CO2 in house at 0~10000 ppm is becoming popular to remind necessary ventilation .
Using CO2 sensor module for a DIY CO2 monitor is a good choice , of course , this is a OEM products , mostly for using by factory .
See detailed at
http://www.gassensor.com.cn/product_en/typeid/9.html -
@epierre I am sales manager of CO2 sensor in this company , We didn't retail CO2 sensor . Because the product is designed to built-in IAQ device , we used to cooperate with factory who need sensor on their device .
This products have MOQ reqirement .You can also send more information about your project to my email ruyi.li@gassensor.com.cn
I will see what support we can provide to you . -
Hello,
There are projects and projects... Here I provide code for many already available sensors, and on Particle/Spark.io we are building hardware that would facilitate IAQ devices building, but it is always the end user that has to order the device, which is thus an important point.
The MOQ is thus irrelevant except if people group themselves to reach the minimum order quantity, but before that we need to make some prototypes so the code will be tested and validated for people to use it anywhere.
Tell me if this is possible to get samples in this optic,
Emmanuel
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Positive answer , we can provide samples . see available types in attachment .Which one do you preferred ?Choose the output interface and I can send communication protocol in advacne .
Just need your information to send products ,your company ,shipping address , contact name , contact phone number .Air Quality Sensor Module Product List (Wuhan Cubic-V2015.1).pdf
Regards
Roy Lee
ruyi.li@gassensor.com.cn -
Hi @epierre ,
the CO2 sensor is not available anymore in the store page. On aliexpress there are sensors from 25$ to 80$; did you test the cheapest one? Or in the meantime you have any other suggestion? I'd like to order one and make my CO2 sensor node.
Thank you.
Regards. -
Hi @epierre ,
the CO2 sensor is not available anymore in the store page. On aliexpress there are sensors from 25$ to 80$; did you test the cheapest one? Or in the meantime you have any other suggestion? I'd like to order one and make my CO2 sensor node.
Thank you.
Regards. -
Hi @epierre ,
the CO2 sensor is not available anymore in the store page. On aliexpress there are sensors from 25$ to 80$; did you test the cheapest one? Or in the meantime you have any other suggestion? I'd like to order one and make my CO2 sensor node.
Thank you.
Regards.@mortommy I'd strongly suggest you go for this sensor. It is expensive, but very-very precise and reliable. You can go for MQ-135 - this is what I did at the beginning. It is utterly useless and can probably be used in enclosed premises, but not in normal houses/flats as its reading are just jumping up and down.
You can go for the MH-Z19 sensor - it is not much cheaper than MH-Z14 (or MH-Z14A).
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@mortommy I'd strongly suggest you go for this sensor. It is expensive, but very-very precise and reliable. You can go for MQ-135 - this is what I did at the beginning. It is utterly useless and can probably be used in enclosed premises, but not in normal houses/flats as its reading are just jumping up and down.
You can go for the MH-Z19 sensor - it is not much cheaper than MH-Z14 (or MH-Z14A).
@alexsh1 said:
@mortommy I'd strongly suggest you go for this sensor. It is expensive, but very-very precise and reliable. You can go for MQ-135 - this is what I did at the beginning. It is utterly useless and can probably be used in enclosed premises, but not in normal houses/flats as its reading are just jumping up and down.
agreed ! that comes with experience !
You can go for the MH-Z19 sensor - it is not much cheaper than MH-Z14 (or MH-Z14A).
it is now $3 difference
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I am playing with a MH-Z19 and found this thread and the link in the first post is not working.
This is the correct link
https://github.com/empierre/arduino/blob/master/AirQuality-CO2-MH-Z14.ino
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Does the MH-Z14 code work for the MH-Z19 as well?
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@alowhum. Yes it does. I've built a combined Co2, humidity and temp sensor using mh-z19 and dht22. it shows current values on an oled and reports back to openhab. will use a number of these for ventilation control.If anyone is interested I'll post the complete build when done (currently waiting for more components from China).
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The downside is that it uses pulse-width modulation to get the data out. This isn't a problem, but it soes mean that you are taking a digital value, turning it into an analog voltage reading that analog voltage with Arduino, and turning it back into a digital value.
I scraped together some code for the MH-Z19 that uses a serial connection to talk to the sensor instead. The sketch can be found here.
I also highly recommend getting the BME280 sensor for your humidity needs. It even gives you barometric data, so you can have your own weather prediction. A sketch that uses that sensor, and that is very easy to combine with the MH-Z19 sketch I just posted to, can be found here.
If you also want to integrate the best-buy dust sensor, have a look at this sketch that already combines the MH-Z19 Co2 sensor and the PMS-7003 air quality (fine dust) sensor.
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HI,
I'll try your serial interface code later.
It seems to be an accurate sensor, however - the values are a bit "bouncy". I'll incorporate a "running average" on the measurements - to calm it down.
I am always tempted to add more sensors to the nodes, but in this case it is not possible.
My casing design would not even allow for one additional resistor... ;-) -
@alowhum. Yes it does. I've built a combined Co2, humidity and temp sensor using mh-z19 and dht22. it shows current values on an oled and reports back to openhab. will use a number of these for ventilation control.If anyone is interested I'll post the complete build when done (currently waiting for more components from China).
@Daniel-Linder Hi Daniel,
I would be quite interested in your Mh-z19 and DHT22 sensor node, I am building a similar one.
Please post the build if you still have it.
Many thanks.
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@Daniel-Linder Hi Daniel,
I would be quite interested in your Mh-z19 and DHT22 sensor node, I am building a similar one.
Please post the build if you still have it.
Many thanks.
FWIW, some weeks ago I ported the MH-Z19 code (the serial interface, by default connected to digital pins 6 and 7) to NodeManager for use in my own little gas detection node (MH-Z19 and four MQ-... sensors). The MH-Z19 code is included in the 1.6 release of NodeManager, so if you are using NodeManager for your nodes, the MH-Z19 sensor should be really easy to set up and use.
