Pt100 connection more than 20 sensors ?

Projects General Guidance
1

Hello,

There is a task to connect more than 20 pt100 sensors, each sensor has 2 contacts, does not want to use a giant motherboard for analogue connection, it is also not clear how many support sensors fee MAX31865?
Want to use them on digitalRead, but I can't figure out how?
I use this pt100:

Have any ideas?

Thanks a lot.

2

The 31865 has a serial type output , you can’t use digital read with it .

Have a look at this :

Couple of points - A 2wire connection of an RTD will not give accurate results due to the lead resistance .
Why do you want to read 20 ?
Something like a DS18B20 is easier to wire , if the temperature range is right ,accurate, look at those.

3

The goal is to use very small sensors, the DS18B20 is quite large, I need sensors like match-size :\

4

I have never seen PT100 that small. maybe they can be found that small, but they are analogue devices anyway.

5

In short, the DS18B20 are the smallest of the digital sensor family?

6

Dunno, they are a rather thick match, but they are surely the most popular, and have a very thin demand on pins.