David James
New Member
blueroomelectronics said:Edit: A 3xAA (4.5V Alkaline) battery power supply as the battery level drops you can measure it by switching RA3 to analog (2.5v ref) as the A/D value will increase as VDD drops.
I think I understand this, can I ask a question to see if I am understanding correctly? Are you saying that you would measure the 2.5V reference voltage (on RA3) with reference to VDD?
Also, what is J1 for in the schematic, I'm not clear how this fits with the thought above as it looks to disconnect the reference voltage from RA3 - is the 'EDIT' (above) a later thought than the schematic?