DHT11 Sensor on Matter

[Varshil]

Hey, Varshil here,
I got stuck during implementation of DHT11 Sensor on Matter SDK.

I follow this Link of Adding clusters to Matter application — nRF Connect SDK 2.4.0 documentation (nordicsemi.com) and I successfully completed all the steps which are available in that link.

Now when I pass the command to the Chip-Tool and below I pasted the commands which I write in Chip-Tool.

sudo ./chip-tool-debug onoff off 12 1

sudo ./chip-tool-debug identify identify 10 12 1

And After this commands I got an Error that:

I: 34957 [SC]Received Sigma3 msg
E: 34966 [SC]The device does not support GetClock_RealTimeMS() API: 3.  Falling back to Last Known Good UTC Time
E: 35163 [DL]Long dispatch time: 187 ms, for event type 2
I: 35263 [EM]<<< [E:4417r S:0 M:58029193 (Ack:51879023)] (U) Msg TX to 0:0000000000000000 [0000] --- Type 0000:40 (SecureChannel:StatusReport)
I: 35276 [IN](U) Sending msg 58029193 to IP address 'UDP:[fd5a:d4ce:1ab2:5fa8:e99b:db8:b197:cff9]:56825'
I: 35287 [SC]SecureSession[0x200034f8]: Moving from state 'kEstablishing' --> 'kActive'
D: 35295 [IN]SecureSession[0x200034f8]: Activated - Type:2 LSID:25501

Your kindly help will be genuinely appreciated.

Thank You.

[AHaug]

Hi

Could you state your setup and link to/state which platform you've configured CHIP Tool for? The link you've pasted is for NCS v2.4.0 so I assume you've used one of these 

Kind regards,
Andreas

[Varshil]

hello,

yes i am using nrf52840DK and chiptool in my PC which is running on Ubuntu 22.04 and yes i am using this and i have also try to use DHT11 with nrf52832DK messuring temprature following this and i got error and that is:

*** Booting Zephyr OS build v3.3.99-ncs1 ***
Sensor fetch failed: -5

and i have also change the overlay file to this.

/ {

dht11 {

compatible = "aosong,dht";

dio-gpios = <&gpio0 9 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;

};

};

[AHaug]

Hi,

On the nRF5280DK, GPIO  is reserved for NFC, see https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrf52840_dk%2FUG%2Fdk%2Fhw_nfc_if.html.

You will need to configure your sensor to a free available GPIO that is not reserved. See the documentation for the nRF52840DK to see which you can use and which are reserved elsewhere.

Kind regards,
Andreas

[Varshil]

Hello AHaug ,

sorry for late reply,

i successfully add dht11 and i can read temprature that through terminal command and i can also read by chip tool but i can not see read attribute in other matter app like google home sample app for matter (GHSAFM) so can i have to change anything else in my code? and i also want to messure humidity so what changes i have to do?

[AHaug]

Hi,

Varshil said:

and i can read temprature that through terminal command

What command? Please remember to include which commands you're using if you're referring to any as I can't see what you're doing from here :) 

Varshil said:

not see read attribute in other matter app like google home sample app for matter (GHSAFM) so can i have to change anything else in my code

After you've completed Adding clusters to Matter application guide, you should go through testing the new sensor application, including testing with commercial Matter ecosystem. This should show you how to do what you wish to achieve

Varshil said:

and i also want to messure humidity so what changes i have to do?

See the data sheet for the dh11 sensor. Section 5 describes how the data is sent from the sensor to the MCU: "Data format: 8bit integral RH data + 8bit decimal RH data + 8bit integral T data + 8bit decimal T data + 8bit check sum". You need to extract the relative humidity (RH) from that data-string and parse it through your own code.

Kind regards,
Andreas