Temperature Wand

Most of you have heard the expression ‘Hot Air Rises’. Well, it’s true.

So in your typical house, it’s going to be hotter near the ceiling than near the floor. How much hotter?

Well, being a Lazy Old Geek, I wanted to know how much. Well, that’s easy, I just point my IR thermometer (See picture) up in the corner and down at the floor. Okay, it reads 82 F at the ceiling and 75 F on the floor. All done.

But wait a minute. This is during a sunny warm day. What about when the A/C is on? What about when the heater is on during the winter? This calls for an Arduino!

Step 1: Parts List

1 Arduino RBBB $10

Arduino USB $5
http://www.instructables.com/id/Arduino-USB/

6 KTY81-250 Temperature sensors $0.45@ Mouser.com
6 1.2K resistors $0.01@ Taydaelectronics.com
25ft Ethernet cable $3.48 ebay.com
10ft ½” PVC $2.70 Home Depot

Well, I had an Arduino RBBB lying around. See picture.

And I recently bought a bunch of KTY81-250 temperature sensors. See picture. I bought these because they were cheap and two leads only. I also had a 25 foot Ethernet cable lying around.

Total cost is around $23.

Comments

[alaskansnowboarder]

Just a tip, you can use the DS18B20 temperature sensor and you can have multiple temperature sensors over the same data line because each sensor has its own unique id... I am planning on putting temperature sensors throughout my house similar to what you are doing...

[diy_bloke]

nifty set up. I may try something like that on a different scale

[msuzuki777]

Thanks. It should be easy to scale it up or down.

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