ADWSystems
Member
I have not had the opportunity to employ as Cds in the manner, but it seems a correct usage or at least a popular one.
The goal is to be able to differentiate bright sun, from clouds, from dark. The typical circuit is a CdS cell-resistor voltage divider connected to a ADC.
If we take a given the Cds Cell in bright sun is 10K and darkness as 100K (just some numbers to work with). What resistor value should be used to achieve the highest range (given 0-5V)? A 10K resistor will be 0.45V to 2.5V. Is there more to be had without burning out the CdS cell?
The goal is to be able to differentiate bright sun, from clouds, from dark. The typical circuit is a CdS cell-resistor voltage divider connected to a ADC.
If we take a given the Cds Cell in bright sun is 10K and darkness as 100K (just some numbers to work with). What resistor value should be used to achieve the highest range (given 0-5V)? A 10K resistor will be 0.45V to 2.5V. Is there more to be had without burning out the CdS cell?