 | | LM34 temp sensor to handy board? —Jeff Keyzer
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| | | I've got on my desk here a National Semiconductor LM34 temperature sensor. It outputs a voltage corresponding to 10mV/deg F. So, if it's 78 degrees F in the room, I get a voltage of .78V. I'd like to hook this device to an analog port on my handy (...) (27 years ago, 20-Jul-97, to lugnet.robotics.handyboard)
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| | | | | Re: LM34 temp sensor to handy board? —Colin A. Reed
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| | | | | It sounds like you just want a standard non-inverting amplifier. wire an op amp like this: |\ sensor------|+\ | >-+-analog input of 6811 +--|-/ | | |/ | +----R1-+ | R 2 | GND where R1 and R2 are chosen such that (R1+R2)/R2 is the gain you want, in (...) (27 years ago, 21-Jul-97, to lugnet.robotics.handyboard)
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| | | | | Re: LM34 temp sensor to handy board? —Jeff Keyzer
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| | | | I tried the circuit out tonight, and it works! (Mostly.) I hooked up a 1K and a 3K resistor for R2 and R1, for a gain of 4, and the output is roughly linear with the input. Still need to do some more testing. I ended up having to use a +/- 12V (...) (27 years ago, 21-Jul-97, to lugnet.robotics.handyboard)
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| | | | | | Re: LM34 temp sensor to handy board? —Jeffrey Strauss Morehead
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| | | | Jeff, I would highly recommend the LM358 single or dual supply op-amp. It comes in a dual package and works great on +5v only. The LM339 is a single supply comparator. There are several manufactures: motorola, and national both have data sheets on (...) (27 years ago, 25-Jul-97, to lugnet.robotics.handyboard)
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