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Smart Home Forum by FIBARO Team

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Using Smart Implant to measure temperature with a 10 kOhm passive temperature sensor



Has anyone done this before. or know if this is possible? I have 4 of these sensors i need to hook up?


Alternatively, is it possible with another z-wave compatible device?

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I don't thing those sensors are expensive enough to buy another z-wave device instead of new quite cheap DS18B20... You can buy 4 of them for about $5 I believe...

Why you think your 10kOhm are any better? Compatible device will cost You about $40-$60... if exists...

Edited by pogo
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More info on connecting DS18B20 here


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and here



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you threw yourself "on a thorny path ...".
NTC sensors can be used.
You have to make a simple voltage divider. I recommend a "pull-up" resistor to limit the current and adjust the voltage to a range that you can measure at the 0-10V analog input.
Then just write the voltage / temperature conversion table in QA (or in the scene).
Note that the table will be quite large and will depend on the required temperature range.
I suggest a step of 0.5 ° C.
In practice, I have already made such tables. Be sure to use the NTC datasheet, where you will find the Ohm / Temperature table. From the above, recalculate the voltage / temperature divider according to the needs.
Then in the mentioned QA (scene) you will periodically query the voltage value on the analog input, you will find in the table a line with the temperature corresponding to the given voltage (the condition will be you will find out between which voltage values the measured voltage will be).
Voala .. mate thermometer.
Watch out for a few trifles.
You will have to add temperature compensation, because the passing voltage will heat up the entire circuit depending on the current flowing ... if you have an NTC near the Smart Implant, it will also heat all the surroundings ...

1) study this topic, it can help you a little:

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2) The time required to read my contribution and the fiber provided by me will be paid for by any NTC laboratory if you immediately purchase a Dalas sensor on the 1Wire bus.

3) if this has not discouraged you yet and you want to play ... I keep my fingers crossed and share the result with us.

P.S. if you plan to have SI in the same place as NTC, you can ignore NTC. SI has internal temperature measurements.
I use it to measure the temperature in the rooms when I have SI under the switch.
In the internal SI settings, it is possible to make temperature compensation ...



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