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Date: | Wed, 28 Aug 2013 15:07:28 +0000 |
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OK, here's another problem I've been playing with (although it has little to do with IPC mission, it might be related).
I am trying to build a system for measuring airborne particulates for humanitarian organizations looking for inexpensive ways to measure/monitor indoor air quality. There are cheap sensors available which might do the job, but they would need periodic re-calibration.
So I need a controlled, extremely small amount of smoke. At first, I thought this would be trivial: Find a cheap part at DigiKey and put too many watts through it. Way too much smoke and too little control. Then I tried burning thin wires. Too irregular because sometimes they incinerate completely and other times they find a tiny defect and just burn that until the wire stops conducting. Then I tried just heating the wire enough to burn off the insulation. Still too irregular! I did just a few experiments and got 30% variation.
Now I'm starting to think maybe a tiny piece of paper on an automotive cigarette lighter. That's a lot of power to get that glowing, and it is not convenient to attach to. Any other ideas?
Wayne
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