can i use a 9 volt battery to power on my Ardunio ?
i tried to power my Arduino from raspberry pi the Arduino powered up but it could not run a motor (it have a different external power source for the motor) so i want to power my Arduino from a 9 volt battery and connect it to the raspberry pi to make serial communication.
1-will my plane work ?
2-is it ok to power Arduino from the external port and the USB together ?
3-Can i use the same 9 volt battery to power up the Arduino and the motor together ?
How did you connect it? Did you connect all the GND lines of everything together?
yes i had connected the motor and the arduino ground together
How did you connect the Arduino to the Raspberry Pi?
A battery will work, but I think it should work from the Pi if you have an external supply for the motor.
Battery won't last long driving a motor. Better to use 6xAA battery pack.
Arduino will operate from battery while Vin/2 is > 3.3V.
Vin comes from the barrel jack and the reverse polarity diode, so the barrel jack needs to be ~ 7.3V.
How are you connecting to the motor? Some transistor that you control from an arduino pin?