Hi All
I have a KTY81/220 temperature sensor that has 2 connectors and I need to know how to wire it up on a breadboard to a Arduino Uno. I found another post on the subject but did not understand it as it talked about using as a bridge. Does one terminal get 5v and the other go to another pin on the Arduino?
Also what resistor should I use. I have checked the data sheet and it lost me!
I would be grateful for any help.
That type sensor is best used with a constant current source, you could connect up a divider network with one end of the sensor to ground, the other end to a 2k resistor and the other end of that to the 3.3 volt pin, connect the junction of sensor and resistor to an analog input pin and see how it works. I don't think linearity will be to good though.
I would use a single supply rail to rail op amp connected as a 2 mA constant curren source and only supply current for a few milliseconds every few minutes to get a reading. That would prevent self heating from continuous current flow.
Thanks for the reply.