Hi All
I'm needing some help to work out the correct scaling of the ADC for a project I'm building.
It's a LM35 to LCD through a 16F690.
It the following correct?
Eg1
For a 0.25degC reading.
0.0025V (LM35 Output) x 1024 (10bit) = 2.56 Vref = 256 Deg Scale (exceeding the LM35 range)
Eg2[/B
For a 0.1degC Reading, I would use a 2.5x opamp between the LM35 and PIC.
0.001 (LM35 output) x 2.5 (opamp) x 1024 (10bit) = 2.56 Vref = 102.4degC reading after software math.)
Is this correct?
Is there perhaps a "calculator tool" for these sort of things?
Thanks
Justin
I'm needing some help to work out the correct scaling of the ADC for a project I'm building.
It's a LM35 to LCD through a 16F690.
It the following correct?
Eg1
For a 0.25degC reading.
0.0025V (LM35 Output) x 1024 (10bit) = 2.56 Vref = 256 Deg Scale (exceeding the LM35 range)
Eg2[/B
For a 0.1degC Reading, I would use a 2.5x opamp between the LM35 and PIC.
0.001 (LM35 output) x 2.5 (opamp) x 1024 (10bit) = 2.56 Vref = 102.4degC reading after software math.)
Is this correct?
Is there perhaps a "calculator tool" for these sort of things?
Thanks
Justin