I am hoping somebody can help me with a temp sesning problem..
I need to measure the temperature of air between about 150 deg C and 250 deg C using my arduino board. To do this I have bought a PT1000 platinum temp sensor. The resistance of the sensor varies between 1570 ome at 150 degC and 1940 ome at 250 deg C.
I have connected the sensor up in parallel with a 2.2kome resistance and i am measuring the voltage at the point between them using the analog input on the arduino. Using this set up the voltage varies from 1.31V at 150 deg C to 1.53V at 250 deg C. The problem is that this only represents about 44 steps on the arduino board so i get a 2.3 deg error before i even start.
Is there a way to design a circuit that gives me 0 to 5V across the temperature range i want to measure????