Having problems getting correct vallues from a PT100 thermal resistor.
Here is our setup:
5v -----> resistor------> Our spark line is here ------> PT100 ------> Ground
Power drains to ground through a resistor, with our analog spark pin we can detect how much power is drained.
This works and gives us an value to read,
however, not in celsius.
so far i know just about the values for the resistance:celsius from here
there is a function which estimates it, i wanna calculate it!.
Found a calculator online
What kind of resistor and math can we use to calculate the temperature?
Thanks in advance,
PS. ive been at this for 5 hours and tried several functions and examples from the internet, which all of them failed to give a proper reading.
most examples use something like
float temp2=(analogRead(A0)*5.0)/1024.0; temp=(temp2-0.5)*100; or // float millivolts = (analogRead(A0) / 1024.0) * 5000; // float celsius = millivolts/10; // sensor output is 10mV per degree Celsius
Both does not give a proper celsius display.