my ac adapter is plugged into the barrel adapter and the 5 volt out put reads 3.8
wait what are the 5V header pin? the pins near 3v3,reset,vin pins if so you can put the voltage in there?
now If I where to use batteries how could I use those? 3 double A's are 4.5 volts, 4 double A's are 6 volts how would I go about doing that?