Interfacing pt100 with Arduino Uno

Using Arduino Sensors
1

Hello guys ! (sorry if my english isnt very well :cry: )

I need to interface pt100 in order to get numeric temperature with the help of Arduino Plus 2.

My circuit is a 3-wire pt100.

Circuit image below.

The problem is that the input analog tension must be between 0-3.3V and i need to get this range because the need of 0.1°C precision.

So I put a Wheatstone bridge on the output of the pt100 to have a range of values varying of 3.3V between minimum and maximum.

But i can't reach it.

Maybe i missed one step in my thinking.

Thanks for reading and helping.

Have a good day and life.

3-wires pt100 Circuit

2

I would be difficult to interface a Pt100 directly to a arduino. i suggest you use a op-amp to convert to the rtd to a voltage or use a commercial rtd converter or use a MAX31865

3

Try here

http://openenergymonitor.org/emon/buildingblocks/rtd-temperature-sensing

4

wrote this lib - https://github.com/RobTillaart/Arduino/tree/master/libraries/MAX31855 -
might be helpful

5

Hello.

Thanks for your replies.

I'll try out.

A lot of thanks, have a nice one.

6

I have your problem with pt100. :cold_sweat: :cold_sweat: do you find a solution for it