paramesium
Newbie level 5

Hello, i have read some of the threads about pic based voltmeter.
If i am measuring an external voltage source by using PIC, where should i ground the external source(since the positive side is on RA0) ? together with the PIC gnd? Please kindly guide me, thanks!
If i am measuring an external voltage source by using PIC, where should i ground the external source(since the positive side is on RA0) ? together with the PIC gnd? Please kindly guide me, thanks!