×
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

Resistive sensor interfacing with controller

Resistive sensor interfacing with controller

Resistive sensor interfacing with controller

(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: Resistive sensor interfacing with controller

If the quantity is analog/multivalue quantity:

You need an interface circuit ( Voltage ref & op.amp )
and ADC. You may need additional pins to interface
to controller but these may be shared among more functions

If it is on/off ( e.g. one value = on, other = off)

Comparator with R-network.

More ?

<nbucska@pcperipherals.com>

RE: Resistive sensor interfacing with controller

(OP)
to nbucska

Hi!
Is there are some sample schematics in the internet?

ank

RE: Resistive sensor interfacing with controller

You can use the sesor resistor together with a fixed resitor in a voltage divider connection and sense the voltage at the midpoint with an analog input of the controller. You will loose  part of the available input range and resolution and you will need some additional calculations, but this will be a very costeffective approach.

RE: Resistive sensor interfacing with controller

What is the final application?

RE: Resistive sensor interfacing with controller

Hi, what micro are u using, what type of port do u have free

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