Wondering if someone can chime in with some advice on a circuit I'm trying to design for my Arduino Mega to do some controlling & monitoring a battery source. Below is the schematic I currently have, but I'm having an issue with the transistor. The current circuit experiences a voltage drop over the transistor which makes perfect sense to me given the setup. I understand that I would need to use a high-side switch to get this to work, but then I have trouble with the analog input (A6) being always on which I don't want.
Anyways, here's the goal...
- Camera batteries remain completely off until SWITCH2 is activated (preserving batteries)
- Power to the cameras is being supplied via the two USB outputs
- When SWITCH2 turns on CAMERA1 power, it should also activate CAMERA2 power, which uses a separate battery source, via transistor switch.
- Both battery sources are being monitored using A6 and CPI-1 so these should have 0 voltage when SWITCH2 is off.
- Side note: Do you think think the diode's are necessary? I was worried about power from the Arduino trying to "charge" the camera battery sources if/when the battery sources were depleted, which I do not want.
Thoughts? Thanks in advance! This is also my first time using Eagle CAD, so I'm sure the sketch could be better. :)