Heat sensors?

Ahh, yea… that makes sense. You could use one of @iharyadi’s Zigbee Environment Sensors which only require USB power to operate. They do a great job of reporting temperature, humidity, pressure, and illuminance. Might be worth a look, especially if your garage has an open outlet in the ceiling that could be used to power the board via a small USB phone charger. Oh, and they also act as a Zigbee repeater!

Also, here is some detailed information regrading Dallas Semiconductors 1-Wire network design guidelines for long networks. This might be useful if you’re trying to use a DS10B20 sensor.

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