ESP8266 Air quality sensor

[sincze]

Aha so mqtt not mandatory?

So works with http.controller out of your box. Nice.
Let's go for a different (aka Jos) approach then.
Tnx.
Shame your solution can not be merged into the main espeasy branch

[RR46]

I added last week the MHZ-19B sensor to my ESP8266. Before connection the sensor first I flashed ESP Easy to the ESP.

After that I installed:
- DHT22 (including 10K pull-up transistor)
- MHZ-19B

DHT22 works great and gives the correct temperature as also the humidity to Domoticz. But the MHZ-19B sensor don't send any data to Domoticz either in ESP module device...



Firmware ESP8266:
Build:⋄ 20103 - Mega
Libraries:⋄ ESP82xx Core 2_4_2, NONOS SDK 2.2.1(cfd48f3), LWIP: 2.0.3
GIT version:⋄
Plugins:⋄ 76 [Normal] [Testing] [Development]
Build time:⋄ Dec 17 2018 00:15:09
Binary filename:⋄ Self built!

Wiring:
Vin = 5V
Gnd = Gnd
RX = D6
TX = D7

Settings:

Spoiler: show

What's going wrong?

I'm looking forward to your support, thanks in advance!

[jvdz]

Looks like you have both d6 and d7 as input but one is tx and one is tx so guess one needs to be output. What do you see in the espeasy log ?
Also the connection to domoticz will not work with the standard build of espeasy. Just read through this thread on the details.

Jos

[RR46]

I switched D6 (Rx) to input and D7 (Tx) to output (low/high), still no measurements in ESP Easy... also after reboot, strange!


I will look in this topic for data sending to Domoticz. But first I need to get measurements in ESP Easy... mayb other firmware flash? Which one would you suggest?

[jvdz]

So what about the log information?

[RR46]

Sorry, forgotten:

1098305: MHZ19: Error, timeout while trying to read
1098305: MHZ19: Unknown response: 0 0 0 0 0 0 0 0 0
1111685: WD : Uptime 19 ConnectFailures 0 FreeMem 14448

Edit 26.03.2019: I found already a topic @ letscontrolit.com...
https://www.letscontrolit.com/forum/vie ... php?t=3857

....Starting version dev-13, this will be supported.....

Where can I check my version? Which build do I need? At the moment I have download a .bin file @ Github. Anyone who has the right .bin file for ESP Easy and sensors I have?

[sincze]

Sorry, forgotten:

1098305: MHZ19: Error, timeout while trying to read
1098305: MHZ19: Unknown response: 0 0 0 0 0 0 0 0 0
1111685: WD : Uptime 19 ConnectFailures 0 FreeMem 14448

Edit 26.03.2019: I found already a topic @ letscontrolit.com...
https://www.letscontrolit.com/forum/vie ... php?t=3857

....Starting version dev-13, this will be supported.....

Where can I check my version? Which build do I need? At the moment I have download a .bin file @ Github. Anyone who has the right .bin file for ESP Easy and sensors I have?

jvdz, created his own image that should work.
I started with the ESPEASY version of last week from the official website., that one worked as well.
However a bit more work needed to get the data in Domoticz as you can see in this forum thread..
btw I did not change anything to input, left it at default.

[EddyG]

Just to show how it can fit in: https://www.eijlander.nl/stekkerbehuizi ... -3703.html
It works fine, except for the random reboot of the espeasy firmware. Most random reboots are within a day.
Housing is 74x43x38 mm.

IMG_20190324_162748+.jpg (192.73 KiB) Viewed 4018 times

IMG_20190324_162734+.jpg (192.46 KiB) Viewed 4018 times

[sincze]

This is worth 100 of my daily compliment points. Brilliant.

[EddyG]

Tnx. It took some effort, but it fits nicely.
Main wires under the pcb and the rest on headers, except some elco's which are under the pcb close to the 5V connection.
Next project will be including a small oled display on the top of the housing.
Current esp8266 connects to Domoticz with PM2,5, PM 10 and systemload.

[Prutsium]

Just to show how it can fit in: https://www.eijlander.nl/stekkerbehuizi ... -3703.html
It works fine, except for the random reboot of the espeasy firmware. Most random reboots are within a day.
Housing is 74x43x38 mm.

IMG_20190324_162748+.jpg
IMG_20190324_162734+.jpg

How do you deal with the temperature? as far as i know the sensor uses it temperature for correction of measurements.

[EddyG]

The top part of the housing has ventilation openings in it, for air flow to get the right amount of 'CO2' inside.
It gets warmer inside the housing then the surrounding air.
I do not know exactly what the influence on the reading is.
My lowest reading so far was 398 ppm. According to https://www.co2.earth/ the current reading is almost 412
Highest reading so far 998 ppm. It reacts within 5-10 minutes when somebody enters the room.
So I am almost 3% off, that's not so bad for this instrument. For me it is not exact science.
Unfortunately there is no input for an offset in Domoticz. (would be nice) to get the bottom value up to 412.
I did put everything on headers, so when something dies it is easy exchangable.
B.t.w. according to the sensor it self is the temperature in the housing 34 C, with a livingroom temperature of 20.5 C

[janvangent2]

Hi!

I have the MH-Z19B up and running (in the log file on esp easy I can read the actual ppm and temp value).
However, I don't receive any updates in domoticz.
I'm running domoticz on port 80 (internal) and 443 for external use (https).

When sending the data to domoticz controller using corrent ip/login and IDX number, it always updates the value to 0 ppm.
I also have a DHT22 sensor connected to this ESP8266 unit, and this one properly sending temp/humidity data to the controller.

When the controller option is disabled and I try updating domoticz using the rule method:

on MHZ19#PPM do
SendToHTTP,192.168.1.106,80,/json.htm?param=udevice&type=command&idx=62&nvalue=[MHZ19#PPM]
endon
It is not updating either.

However, when I use my browser to go to:

Code: Select all

http://192.168.1.106/json.htm?param=udevice&type=command&idx=62&nvalue=111.00

It updates without any issues to PPM = 111

Code: Select all

{
   "status" : "OK",
   "title" : "Update Device"
}

What is going on here?

Log:

Code: Select all

3401524: MHZ19: PPM value: 924 Temp/S/U values: 23/0/0.00
3401527: EVENT: MHZ19#PPM=924.00
3401541: ACT : SendToHTTP,192.168.1.106,80,/json.htm?param=udevice&type=command&idx=62&nvalue=924.00
3401550: Command: sendtohttp
3401567: EVENT: MHZ19#Temperature=23.00
3401576: EVENT: MHZ19#U=0.00

[janvangent2]

Edit: when making a "custom sensor" in Domoticz instead of an "Air quality sensor" it is working.

How can I get the same visualisation and good/fair/bad air quality indication for such a custom sensor?

[jvdz]

You are probably using the standard version of ESPEasy?
If so, you need to add the appropriate rules to ESPEASY as the standard version doesn't have the correct configuration to support Domoticz via API/JSON calls because it is defines as a 3 svalue sensor in stead of a one nvalue sensor.
I have build my own version to support that and other stuff at the time I made it, as the b version wasn't working at that time.
Now all is working except REST for Domoticz.

Example rules are defined in this thread.

Jos

[janvangent2]

You are probably using the standard version of ESPEasy?
If so, you need to add the appropriate rules to ESPEASY as the standard version doesn't have the correct configuration to support Domoticz via API/JSON calls because it is defines as a 3 svalue sensor in stead of a one nvalue sensor.
I have build my own version to support that and other stuff at the time I made it, as the b version wasn't working at that time.
Now all is working except REST for Domoticz.

Example rules are defined in this thread.

Jos

Hi Jos,

As you see in 2 posts above, I did try 2 ways:

1)
adding the rule:

Code: Select all

on MHZ19#PPM do
SendToHTTP,192.168.1.106,80,/json.htm?param=udevice&type=command&idx=62&nvalue=[MHZ19#PPM]
endon

Which doesn't update domoticz. When I try it manually in browser, it does work/update.
In the log of ESPeasy I can see the "rule" is called, Event --> Act.
So not sure where it goes wrong.

The 2nd option:
2) Using the controlicz controller
--> this works with a custom sensor, but not with air quality as a dummy sensor.

Could you upload your version of ESPeasy somewhere? Because the link to github a couple of pages ago in this thread is no longer active.

[jvdz]

Ah, I see now..... sorry about that.
Could it be you are using Userid/Password security for the Local network preventing the url to update the device?

That second option is what my story was about!

EDIT: there is already a working bin available in this branch: https://github.com/jvanderzande/ESPEasy ... ntv20/dist

[sincze]

Ah, I see now..... sorry about that.
Could it be you are using Userid/Password security for the Local network preventing the url to update the device?

That second option is what my story was about!

EDIT: there is already a working bin available in this branch: https://github.com/jvanderzande/ESPEasy ... ntv20/dist

You can use the jvdz solution indeed.

If you want to remain stock.. it is doable. However Rules are NOT working if you need a username and password to update the device as mentioned by jvdz ..

This is also an option

PPM.JPG (28.62 KiB) Viewed 3846 times

Use a custom sensor and airquality meter(idx 21) in combination with some Device LUA logic
Have the ESP update the custom sensor... and the custom sensor the air quality meter...

Code: Select all

commandArray = {}

-- loop through all the changed devices
for deviceName,deviceValue in pairs(devicechanged) do
--    print ("Device based event fired on '"..deviceName.."', value '"..tostring(deviceValue).."'");
    if (deviceName=='PPM_C') then
--        print ("Device value '"..deviceName.."', value '"..tostring(deviceValue).."'");
        devvalue=tostring(deviceValue)
        devidx=21
        commandArray['UpdateDevice']=devidx .. "|" .. devvalue .. "|0"
        os.execute ('curl -s "http://192.168.**.**:8080/json.htm?type=command&param=udevice&idx=1711&nvalue="'..devvalue)
    end
end

return commandArray

Haha in this case I also update a remote domoticz machine with the ' os.execute'.. you can skip that part..

[janvangent2]

Ah, I see now..... sorry about that.
Could it be you are using Userid/Password security for the Local network preventing the url to update the device?

That second option is what my story was about!

EDIT: there is already a working bin available in this branch: https://github.com/jvanderzande/ESPEasy ... ntv20/dist

OK, flashed this one.
But very strange, it did not overwrite any of the settings of the previous flash. So it immediatly connected to my wifi, and settings of the hardware en controller were already there.
Seems to work now! Thanks

One remark: accessing the espeasy config (so browsing to its IP adres) is much slower compared to the standard latest flash. Any idea what could cause this?

[jvdz]

Nice!
The config is stored in EEPROM so it indeed should just work after flashing a new bin, unless they changed the format of the storage.
I have no idea and haven't looked at that code for quite some time now.
Which version did you flash before? This is the V2.0 version of the source, which I used at the time and is now working for quite a while for me.

Jos