Arduino + Flue Temp Thermocouple

[twofer]

This past weekend I finished another piece of the Arduino control system (and future data logging), a flue temperature sensor. I know that it's already been done before but I'm still pretty tickled to have it up and running and wanted to show it off.

Next up might be a thermocouple install in the secondary combustion chamber. I think that it will help being another piece of the measurement puzzle and dialing in efficiency but I'm nervous about drilling a hole in the EKO.

 

[twitch]

twofer,
What did you end up using for the thermocouple amplifier? I've been looking for an off the shelf, fairly cheap one already on a board, so I'd only have to run wires to the controller.

 

[twofer]

I used the AD595. It isn't the cheapest but I wanted something simple to get up and running that I could mount on a breadboard.

 

[twitch]

I was trying to find something like the board below, but they haven't had any in stock in months, and haven't replied to email questions about it.

http://store.makerbot.com/thermocouple-sensor-v1-0-kit.html

 

[Nofossil]

I'd be happy to sell my amplifier as a kit. I can't possibly come close to their price, though - the AD595 costs $12 apiece and my amplifier has two of them! They also don't use a bypass capacitor, so the amplifier would be VERY susceptible to electrical noise.

My amp is two channels so needs two AD595 chips. I use RJ12 connectors rather than soldering the wires directly to the board. The board requires +5V and provides an output of 0-2.5V which corresponds to a temperature range of 0-2500 °F.

If anyone is interested, I'd sell mine as a kit without the AD595 chips for $20 plus actual shipping cost. Kit would be circuit board, bypass cap, two resistors, and two RJ12 connectors.