MQ135 sucks if i have to believe blogs online. Really hard to get a trustworthy result.
MH-Z19 is most valueable option for now, good price and readings seem to be accurate.

How accurate is this sensor compared to something like a more expensive sensor like a SenseAir K30 ? Any idea?
And what about calibration? Does it need calibration?

Everything is 55 dollars now, so not interesting anymore.
Too bad.

Big fat warning!
Doublecheck the frequency they use before buying anything that might end up useless.

Z-Wave uses different frequencies across the globe.

Looking good :) And i don't want to be a party p**per, but the reason i never did this is that WhatsApp doesn't allow you to use third party clients like 'yowsup'. So it might work fine now, but it could be very possible that the phone number you use for yowsup will get banned. I strongly advise to ...

Your Lua script seems a bit complicated. Have a look at my script that i used to send the outside temperature to my thermostat: https://bitbucket.org/frankiepankie/domoscripts/src/be12ba80c4fbb5c0724cfb9f3818257183aee9aa/lua/script_device_outsidetemp_otmonitor.lua?at=master&fileviewer=file-view ...

Hi Thinkpad, [...] Hope you can help me, [...] Hi, It has been too long ago for me to remember how it worked. I now use a OTGW (Opentherm Gateway) to monitor my 'CV-ketel'. No need to tape sensors to the pipework, just use the data coming from the heater itself. See http://gathering.tweakers.net ...

I see i had already replied earlier to this topic. The reason i never tried it, is because it is not allowed by the terms of WhatsApp. And i didn't want to risk that my 06-number would get blocked by WhatsApp. I now use Pushover for all my notifications. That is only from home automation >> phone ...

Please share the sketch if it works correctly, might be useful for others.

The diode (marked 'D1' in the schematic) does a single rectifying step which makes the AC, DC :) Optocoupler is also possible, but when i tried that, i had some difficulties in letting it work correctly. I read somewhere that it needs enough voltage to go 'fully open'. A relay was easier for me. And ...

What is the reason you have the OTGW in Domoticz? You could also run the otmonitor-daemon on your system, this daemon also has a onboard webserver with a page that accepts serial commands. Then setting the TC would be something like http://ip/command?TC=19 You could put that URL in the OnCommand of ...

Why would you want to write directly to the domoticz.db database? Seems like a very failure-prone situation to me. If you're not careful, you could mess up your whole database... Just create virtual sensors and put the data in them by calling the JSON API of Domoticz from your script (which is a ...

This firmware looks interesting: https://eryk.io/2015/10/esp8266-based-wifi-rgb-controller-h801/ Using a simple http call to the device on http://192.168.0.xx/rgb/ff0000 it is possible to send RGB values in HEX and let the color of the leds change to this color. It seems this: https://github.com ...

Third place for Domoticz! Or actually first place, i don't see Philips Hue and Nest really as home automation controller, but more like products to be used with a controller. http://tweakers.net/reviews/4349/9/tweakers-awards-15-16-de-uitslag-opslag-en-netwerken.html Philips Hue Nest Domoticz ...

You probably have it called script_device.... instead of script_time

Nice!

Don't forget we also have our own compatibility list:
http://domoticz.com/wiki/Hardware

My theme is available for the developers to include in Domoticz, no problem. But i don't want to have the responsibility for it, i don't have enough coding knowledge to fix CSS-problems and such. Also, i have moved to the Zipato Zipabox a few weeks ago (Dutch explanation here , if interested), which ...

Try creating a switch using the 'ARC' protocol and a random ID. Then put the unit in learning mode and click the 'Test' button in the popup that opened when you are creating the switch. The older Eurodomest set i had from Action worked fine that way. I couldn't get the included remote to work, but i ...

Nice! Seems like bit of a fiddly workaround, but at least it's good that someone is busy with it!

Could it be that the 'Bray's terminal' software inverts the data? For my meter it was needed to solder an BS170-transistor + 10K resistor in the dataline (see my topic under 'Meters' subforum) to reinvert the data to a readable format.