Hello. I'm currently working in a project involving op amps as followers between 0 an 5 volts. Those op amps will be sampled at arduino's analog inputs.
If I power them between 0 and 5 volts they will not work because they are not able to follow levels less than 1.8 volts. So I`m thinking to power them between 0 and 9 volts and use 5 volts signal as reference level (shift 0-5-9 to -5,0,5). Then in Arduino input I would see levels movin arround 5 and 9 volts.
The question is if analog ref could help me to downshift the signal an amount of 5 volt.
Thanks.