Tuesday, 4 May 2010


I was about to buy a couple of LM35 temperature sensors and then found some LM35DZs in a box of surplus stuff I got about a year ago. These are a really easy to use component, they operate from a 5v supply and output a linear voltage at 10mV per degree C with 100 degrees giving 1 volt.

I hooked one up to the PIC voltmeter project which reads 0-5 volts as 0-1023 points and got a reading of 16 which equated to roughly 7 degrees. I'll need to spend more time on this because the room was clearly much warmer than that, but when I held the LM35 between my thumb and finger the reading rose steadily.

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