Connect with us

how to connect linear thermistor to the mcu

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

Scroll to continue with content
  1. jerk


    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.
    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
    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

    Jan 21, 2010
    Please see this thread.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day