Contact US

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!

*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

Microcontroller ESP32 & RTD100

Microcontroller ESP32 & RTD100

Microcontroller ESP32 & RTD100


Attached is reference to used sensor RTD100 to detect cooling water temperature using Microcontroller ESP32.


1. How is communication between ESP 32 with RTD100? (as far i know RTD100 working with resistance not ampere 4-20)

2. Possible using another sensor to replace RTD100, if possible, and how?

3. Does it ESP32 only can get signal from RT100 not from other sensor type? and how?

RE: Microcontroller ESP32 & RTD100

The resistance temperature detector (RTD) itself is just that - a device which changes resistance with temperature. It will not put out either a voltage or current signal. However, it CAN be routed to a transmitter which converts the resistance measurement to an electrical (usually 4-20 mA) signal which can THEN be routed to a microcontroller such as the ESP2.

Converting energy to motion for more than half a century

RE: Microcontroller ESP32 & RTD100

The blue thing is a temperature transmitter, which reads the RTD signal by sourcing a constant current through the RTD, reading the voltage drop, and outputing a linearized temperature signal whose range is defined on the label, which appears to be a scaled output of 0-10V (but it's hard to read.)

The 2-wire RTD connects to the input terminals shown as a rectangle/resistor. The label tells you that the transmitter needs a 24Vdc power supply to run the tranmitter. One terminal is labeled (+) so that's where the 24Vdc (+) connects. The zero V/common side of the 24V is not marked, so it's probably a 3-wire transmitter where the power supply (-)/common connects to the output signal terminal labeled (-).

I can read none of the micro's terminal labels, but look for 0-10Vdc analog input.

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! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close