Daz1712:
Two Questions.Are you using rechargables at 1.2v or drycells at 1.5v?
Did you realise that the Vin you connected the batteries to then runs through a 5v reg, as this will not be high enough?
[http://arduino.cc/en/uploads/Main/ArduinoNano30Schematic.pdf]http://arduino.cc/en/uploads/Main/ArduinoNano30Schematic.pdf]http://arduino.cc/en/uploads/Main/ArduinoNano30Schematic.pdf](http://arduino.cc/en/uploads/Main/ArduinoNano30Schematic.pdf)
Currently I am using 4x 1.2V batteries (4.8V).
It is indeed well below the 7-12 V specified for the Nano, but so far it seems to work correctly despite this low voltage.
I limited the voltage because of the Servomotors (2x SG90) which are limited to 4.8V. I could have added a voltage regulator for the servomotors though. Should I ? I mean, knowing that it works with the current power supply, can I continue with this low voltage or should I increase the voltage and add a voltage regulator to power the servomotors ? (I haven't bought the NOR gate / P-channel MOSFET yet, so I can still add a voltage regulator for the servos if this is necessary).
About the P-channel MOSFET, I've seen on Sparkfun the NDP6020P Sparkfun
Datasheet here: Datasheet NDP6020P
VGS(TH) is between -0,4V and -1V.
I believe this one could be used for my project ?
I am now trying to find a NOR gate that matches the NDP6020P.
If I am right, it should have a low-state voltage that is below 3.8V (4.8V - 1V), and a high voltage above 4.4V (4.8V - 0.4V). Is it correct ?
So far, the closest I have found to those requirements is the Texas Instruments CD4001UBE.
Datasheet CD4001UBE
But I think I can find a better one!