Designing a simple and cheap temperature logger @ Pick and Place blog…
Some time ago, I was looking for a temperature logger. After checking what was available on the market and the prices, I decided to make one myself.
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2 Comments
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I did a little temp logger thing like this some time ago. I wanted to toss a couple of these into my refrigerator’s freezer and fridge sections and see how they were doing over-time. The problem was condensation. I tried potting the little boards, that presented even more problems, especially because I could no longer replace the battery without breaking it open. I could have used a rechargeable battery and potted that, but my philosophy is to NEVER build or buy ANYTHING that doesn’t have an easily user-serviceable battery (hence I DO NOT own even one Apple iPhone, iPod, etc. product, and never will). Maybe today using a SuperCap would be a viable alternative(?)
Yes, the potting thing can create more problems than solve. In a former life, I was working on pressure sensors that were in an extreme environment (temperature, vibrations, accelerations) and we were potting them. It was production-line grade, so we had a vacuum machine but still, we had a lot of trouble (especially for the UHF wireless transmitter and its impedance matched lines). And of course, the part becomes non serviceable.
I planned to test my temperature logger in my fridge too, but didn’t think of condensation (well, I did, but didn’t think it would be so problematic). I’ll try this as soon as I have a working prototype.