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1-wire temperature sensor inside light switch

Very low cost, easy to make 1-wire temperature sensors

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My home has 1-wire DS18B20 temperature sensors inside every light switch to report the room temperature to our loxone smart home system.

This is a very cost effective way of mounting the sensors. Approx £0.50 for the sensor and £0.50 for the connector. Links to the Aliexpress source are in the components list.

I've attached a screenshot of these working in from our loxone server.

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wasim158 wrote 11/03/2017 at 20:40 point

Many thanks for reply. I'l try them in the switch then. I thought hot air rises up so sensors in the ceiling (incorporated in PIR) would have made more sense with more accurate reading.

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andrew.crockford wrote 11/03/2017 at 12:41 point

Yep seems to be.  I bought some little digital room temp sensors, and balanced them on top of the light switch & compare readings.  They are within +/- 0.3 or 0.4 of a degree- although I think the digital sensor I bought is not very accurate.  I was told by a home automation specialist that the light switch is the best place, as room temperatures vary from the floor to the ceiling, and our perceived temperature at light switch height is the best.

It maybe that they are slightly slower to respond to temp changes behind the light switch, but only by a factor of minutes- not hours.

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wasim158 wrote 11/02/2017 at 21:12 point

Does it pick up reliable temp reading given tucked in behind the switch in the wall? Thanks

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