I've noticed that the temperature sensor amplification could be improved.
Just follow these instructions:
- R3 of 10kohm
- R4 of 47kohm
- R5 of 1kohm
If you want an explanation, keep reading.
The equation for the op. amp. output voltage is given by:
The ideal value for Vo is just below 5V when Rsens is at it's greatest value. Assuming Rsens of 200ohm when hot, calculating for 48x gain and R3 of 10kohm:
That means the max value at the output of the operational amplifier is 4.71V. We could increase this value and that would increase the precision in the temperature readings.