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how to connect linear thermistor to the mcu

Discussion in 'General Electronics Discussion' started by jerk, Oct 14, 2010.

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  1. jerk

    jerk

    16
    0
    Oct 13, 2010
    I would like to connect linear temp. probe to one of the 8 bit A/D convertor of my PIC mcu.
    Below is the schematics I found on the internet.
    [​IMG]
    Equation for the voltage divider Vout=Vin*R2/R1+R2.

    So if I take te specifications for common 100pt linear thermistor:
    1kohm at 0°C
    0.385ohm/K
    max voltage 9V
    max current 2mA (1mA suggested)

    I need 4kohm R2 to limit the current to 1mA. So if I put those data to the upper equation I get Vout at 0°C to be 1V and at 100°C also rounnd 1V.

    If I change R1 and R2 (thermistor up) I get Vout at 0°C to be 4V and at 100°C also round 4V.

    So how can I get that output voltage will be between 0 and 5V?
     
    Last edited: Oct 14, 2010
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,411
    2,779
    Jan 21, 2010
    Please see this thread.
     
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