×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

I need help with interfacing resistive sensor

I need help with interfacing resistive sensor

I need help with interfacing resistive sensor

(OP)
Hi!

I need help with interfacing resistive sensor to microcontroller. Sensor resistance changing between 100kohm to 2Megaohm. I must use only one pin on controller. That mean I need some kind of relay output circuit. But which kind of circuit give me good results.

Ank

RE: I need help with interfacing resistive sensor

Ank:

What you need is a temperature transmitter.  The device will take the sensor output and give you a control signal (i.e.  4-20ma or 0-10v) that the controller will recognize. Check out www.kele.com. ; They have transmitters for a variety of sensors and applications.  I hope this helps.

Steve3108

RE: I need help with interfacing resistive sensor

Do you have to display this temp? Or is some action required at a given temperature(and therefore given resistance)? If you just need to switch at a given temp then use a voltage divider biased with 5V and use the digital input on the microcontroller. This is not the most accurate method but it suits a lot of applications. If you need to know the exact temperature then the only way to do it is to float the signal on some reference voltage (depends on whether TC is positive or negative) and use a microcontroller with an AD converter or buy an AD IC.  

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources