I want to connect a Servomotor 5v-7,4v to Arduino UNO R3, with the signal cable to a PWM (-9) and the + and - cable to an external battery of 7,4v 2000mah. Arduino will be powered by another battery 9v to the jack if it is needed.
The Arduino GND to the protoboard connected with the GND of the Servomotor and the GND of the battery.
My question is the next one: Can I connect the Arduino GND to the external power supply (battery) if this has 7,4v 2000mah?
Below there is a prototype, can you check if it is correct?
If it is found that the breadboard does not have enough current capability for servos building a power distribution board works well. If not up for soldering use a power distribution block of some sort.
Yes I know that with 6v would be enough, but I want to take all the power of the servo... The stall current of it is at 7,4v 2400mah. For this my question, if I want to connect 2 servos, I need a bigger battery (4000mah for example) or 2000mah is enough?