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:
![\color{White} \large Vo = GAIN * 5V * \frac{Rsens}{R3 + Rsens}]( "\color{White} \large Vo = GAIN * 5V * \frac{Rsens}{R3 + Rsens}")
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:
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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.
Kuro
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