Converts temperature degrees C to F
Alter the top left source in mV which represents the sensor as C, then view F next to it.
NB: This is a C/F conversion setup only. It does not configure the sensor.
There are many formula variations which convert °C to °F or vice versa.
An easy one to remember is : add 40, multiply by 9/5 (ie: multiply by 1.8), subtract 40 ... that is C to F
If you are wanting °F to °C, then multiply by 5/9 (ie: by 0.5556) in the above formula instead of the 9/5
Remember which way round to multiply... F reads fatter ie larger.
Here in the schematic is that sequence:
Left top opamp is summing 40 to the adjustable C temp source there (which is set to °C=10 mV default here).
Right top opamp multiplies the result by 1.8
Bottom opamp subtracts 40
There are other ways using just a single opamp, .... the demonstration here shows each action on its own.
Alter the top left source in mV which represents the sensor as C, then view F next to it.
eg:
°C °F
0 32 ... freezing water
10 50
16 61
28 82 ... hot day
100 212 ... boiling water
Values are approx.
Final result can be converted from - to + with a little more effort in the schematic.
The final mV output can then also be further amplified as reqd.
Very bottom resistor can be gently adjusted to alter/calibrate the final result if reqd.
Here is a full F to C and vice versa version: http://everycircuit.com/circuit/5362322511233024
And yet a different variation here: http://everycircuit.com/circuit/5785433417187328
