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HugoFitz

DHT22 - Has anyone got it working?

Question

Hi,

I'm trying to use the Smart Implant with a DHT22 as discrete humidity and temperature sensor for automations in our bathroom.

 

I've followed the super vague instructions here

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"Change values of parameters:

  • Connected to IN1: change parameter 20 to 4
  • Connected to IN2: change parameter 21 to 4"

 

I'm running a Home Centre Lite, I've set the sensor like below but nothing else seems to happen! Can anyone give me the next clue as to what to do? Thanks in advance :-)

 

 

image.png.cb98cd5e8cfda8674c46a40ebdcc09c2.png

 

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I don't have a Smart Implant myself, but I don't think your sensor is an analog 0-10V unit.
Is there no choice for 1-wire or digital input?

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  • You're  the DHT22 is a digital sensor and should communicate on serial to the SP connection of the SmartImplant. 

     

    The manual says to set parameter 20 to 4 and parameter 21 to 4.

    After some digging in the manual I found what these relate to set accordingly in HCL

     

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    Yeah, I've had once a DHT22 on a Smart Implant. It's a digital sensor and you don't have to change parameters 20 and 21, leave them on 'not used' if you don't use them. Those are for the analog inputs (yellow and green wire).

    Just connect the DHT22 in the right way to the Smart Implant, see page 10, paragraph 4.4. Important is to include the smart implant after the DHT22 is connected and not before. you can't combine DHT22 with DS18B20's on the same Smart Implant. Be careful with the sensors, they're very sensitive and you kill them easily when soldering or connect them in the wrong way.

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  • Thank you so much. I'll give this a go.

     

    I'd been resetting the Smart Implant.

     

    Hadn't twigged that I'd need to remove it and re-add it to the Z-Wave network!

     

    Will post the results.

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