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Voltage divider for 10-180 ohms. — Parallax Forums

Voltage divider for 10-180 ohms.

sccoupesccoupe Posts: 118
edited 2009-08-16 16:02 in BASIC Stamp
I have a pressure sensor that reads 10-180 ohms at 0-150 psi. I want to use a stamp to do and analog to digital conversion. I think assume that the sensor is linear ohms to pressure. So, I need to run the sensor in series with another resistor with a 5 volt source across them and then check the voltage drop across the sensor with the stamp, do a little calculation and thats all there is to it. The problem is that the resistor seems to need to be such a small value, like 100 ohms. So, with no pressure the load would be only 110 ohms and this is not enough resistance for the 5 volt supply? Wont this burn up the resistors or the voltage regulator? How to I get accuracy from this?

Thanks

Comments

  • $WMc%$WMc% Posts: 1,884
    edited 2009-08-16 04:28
    Take a look at the ADC0831


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  • PJAllenPJAllen Banned Posts: 5,065
    edited 2009-08-16 16:02
    If the output of this pressure sensor is a variable resistance then why can't "we"·use RCTIME ?
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