hey guys. im using an adc on a vellman k8055 to measure battery voltages.
my battery voltage range is 12 (flat)-14.4 volts (charged). my adc range is 0-5v and its only 8 bit.
to maximise the resolution i raise the ground voltage with a 12v regulator so the input on the adc will be from 0-4.4v. problem is that the regulator has a variance of about .05v on the output which is stuffing up my measurements considerably.
so what i believe im looking for is a precision 12v reference.
I cant find any 12 references anywhere though. i found this 10v one though - **broken link removed**
close but no cigar.
is there something else that can do the job here? thanks for any tips.
my battery voltage range is 12 (flat)-14.4 volts (charged). my adc range is 0-5v and its only 8 bit.
to maximise the resolution i raise the ground voltage with a 12v regulator so the input on the adc will be from 0-4.4v. problem is that the regulator has a variance of about .05v on the output which is stuffing up my measurements considerably.
so what i believe im looking for is a precision 12v reference.
I cant find any 12 references anywhere though. i found this 10v one though - **broken link removed**
close but no cigar.
is there something else that can do the job here? thanks for any tips.