jshroomy
Joined: 04 Jul 2006
Posts: 1
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 Posted:
Tue Jul 04, 2006 7:45 pm Post subject:
Advice or ideas on a data logging circuit. |
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Greetings. I'm working on making something like a data logger that will record slight voltage changes to cassette for later review.
Basically I need to record slight temp changes over night, and then feed it into the sound card to use a spectrum analyzer and watch the dips and spikes of the temperature.
What I've done so far is using a 555 oscillator, I've put a thermistor in place so that the pitch of the tone changes as the temp does. I then hook that up to my recorder and review the results on screen. It works well, and serves the purpose.
The thing is... Obviously the screen is full of harmonics. I would like to feed in more sensors/oscillators and possibly be able to record additional locations every 2khz of the spectrum or so. That way I can review all the locations at once and identify temp drops/spikes.
I've tried using a low pass RC filter on the output of the 555, but its not attenuating as I'd like.
Is there an easier way of doing this? Am I making this much harder than it needs to be? I'll answer any questions, and would appreciate any help you can give.
Thanks in advance.
jshroomy
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