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IR Temperature Controller for SMD Skillet Reflow

IR Temperature Controller for SMD Skillet Reflow
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This instructable will help if your trying to get into making your own circuit boards using SMD (surface mount device) re-flow. After hand soldering a bunch of boards I became really interested myself.

In this instructable I'm going to talk mostly about using the Melexis MLX90614 IR (infrared radiation) sensor. Also, while building a sensor interface board, I'll also take care of driving a Crydom SSR (solid state relay).

There is already a bunch of web info on re-flowing boards using either a skillet or toaster oven. Both of the following links are good:

http://www.circuitsathome.com/production/on-reflow-soldering

http://www.sparkfun.com/commerce/advanced_search_result.php?keywords=reflow&x=0&y=0&search_section=tutorials

What I thought was missing was information on instrumenting the skillet. This  instructable should take care of that.

Note, Parallax already makes, and sells, a Melexis IR interface board. However, I don't think it has any digital outputs (I could be wrong since I never owned  one). There is no way to remotely mount their sensor either - their design has the sensor solder right onto an interface board.
 
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Step 1Construct a method to hold the sensor.

Construct a method to hold the sensor.
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Build a simple counterweight so that the IR sensor can be suspended above the skillet. I pulled four wires through the cup and copper spiral.
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4 comments
Aug 26, 2011. 10:11 AMR3mus says:
I know this is a bit strange of a question, but where did you get that table? Its the kinds I see at school, and around the workplace, but I can never figure out where to buy one.
Jun 17, 2011. 8:37 AMledartist says:
Great Instructable. Great to see that graph.

I use a hot plate to solder my boards as well, but I never calculated the temperature ramp. I suspect my hot plate doesn't go up that quickly either, but the little smoke always makes me nervous...

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Author:jimk3038(www.ph-elec.com)
Founder of Powerhouse Electronics. For more info goto: www.ph-elec.com