Wednesday, September 11, 2013

Episode 27: Extending Sensors using Ethernet (CAT5) cable

I bought 4 RJ-45 breakout circuits:
So I hooked 2 of them up to my DHT22 temperature sensor with 50' of 24-gauge CAT5 cable between them:
And it worked.

The DHT takes 3 of the 8 wires, but one is ground (which could be shared).  So I could probably extend 4 devices with one pair of these interface cards. That's way better than using 3-wire electrical extension cords. My 4 plugs cost about $20 with shipping. The 50' CAT5 was $15.

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