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stefxx wrote: One question: how accurate are your sensors (how are they calibrated)?

They monitor what is the lowest CO2 ppm value read and assume this is 400 ppm. This is processed in 8 days cycles, where the lowest ppm value from the previous period is used for the current.
The sensor is electro chemical and according to the spec the error they give is +- 15-20% . When i was measuring them against a K30 CO2 sensor, it was even better. But it all depends on how correct the baseline has been computed. here you can read some more details in case you are interested

I am currently researching some new "cheap" (<40 eur) NDIR sensors that promise error <5%, but i am still in the research phase. The last i tried from another company (MH-Z19) was crap. In case it turns out they work fine it will be great

Co2 sensors are in
installing was easy now every x seconds i receive the C02 data via a local http call
CO2 sensor value data and an ID which you can set
The sensor is extreme sensitive and reacts directly if I breath in to it, need to brush my teeth

Can you get the data in HS3?

im not using HS but its a http call like this so the script to make is very easy

Those sensor are nice looking!
Getting the data via a http call is easy to do so that's a nice option.
Now only finding out what the price is and if there is a forum discount

Maybe we can ask vlast3k for a group buy. I would like to have two of them

Thanks,
Just to clarify - the Sensor will Send the data to a server, and not work as Web Server, so that you can query it (at least for the time being)
Of course i can provide you a discount
The prices are on the site http://vair-monitor.com
I can give you ~10% discount that is the Wifi device for 55 eur
And the Wifi+Display - for 65 eur
Shipping to EU is 4 eur, and takes 3-4 business days.

In addition, as I already mentioned - i am currently evaluating an NDIR Sensor with better prececision (+- 5%). The existing is rated +-15%.
I suppose that i will be ready with this in one week. It will cost 15 eur additionally (70 eur (Wifi), 80 eur (Wifi + Display))

For those that do not want display and LEDs, but only the Sensor and Wifi - I am planning a new version (maybe in 3 weeks from now), that will be a small box, with a status led - that submits the CO2 Value to your server. It will be only available with the higher precision sensor (NDIR) and cost will be 60 eur, for the forum i will sell it for 55 eur

cool, I'm also interested in this. especially as your also going to provide an version without dispay, and only wifi
we can display our own data in the domotica system so I think for most of the users here that will be an good addon for your product

i'll keep following this topc

So do I I'm also interested I a version without display but with WiFi

Verstuurd vanaf mijn XT1562 met Tapatalk

+1

Ed

also interested!

Me too

the display is very handy and in the dark the digits change to a very small size (dim effect)

Could you post pictures taken in the dark?

Also interested...


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