Temperature readings into a PC?

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eyevancsu
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Re: Temperature readings into a PC?

Post by eyevancsu » Fri May 02, 2003 5:59 pm

im no expert at this but how about using a AD509 from maxim, also from maxim is the ICL7106 to make a temp display.
a schematic is found @ http://ib.cnea.gov.ar/~electronica/bibl ... FN3171.pdf
for a temp sensor with a 3 1/2 digit led display.
if this applies, you can simply put it in the range of the camera like MANUKA said, by the way, these parts are free from maxim through free samples, i think they ship free worldwide, but who knows.<p>regards,<p>ivan

rshayes
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Re: Temperature readings into a PC?

Post by rshayes » Sat May 03, 2003 4:46 am

The simplest hardware might be simply a thermistor connected directly to a game port, if available. Actually, a game port could support four independent temperature measurements using thermistors. Radio Shack used to sell a 10 kilohm (at 25 degrees centigrade) thermistor.<p>The down side is that thermistors are normally not precision parts and are quite non-linear. This means that software would have to be written to compensate for the non-linearity, posssibly using a look up table. Individual calibration might also be necessary.<p>Linearized thermistor assemblies may still be available from Omega or Yellow Springs Instruments, but probably at much higher cost than simple thermistors.<p>Quick Basic has a STICK function which reads the joystick positions. Visual Basic may have something similar. Either language could probably be used to do the linearization and create a .txt file.

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