Hi guys! I'm working on a project and I'm trying to get around with having an external power source for both Arduino Uno and motor shield (DK Electronics Motor Shield DK Electronics Motor Shield V1.0 ). Other topics say that if I have an external power source for the shield, there's no need to connect the jumpers. I'm trying to use the Sweep from IDE to test my servo (CYS S-8503). My question is how do I relay the command to the servo if there's no jumpers connected? I tried having a male-female jumpers for pins 9 and 10 hoping it'll work but I failed. Thanks guys!
That's an ancient inefficient L298D motor shield, only suitable for tiny toy motors.
Can't power a servo through that shield, because servo power is taken from Arduino's 5volt supply.
Well, maybe a small SG-90 for testing, but certainly not the servo you linked to with a stall current of almost 4Amp.
You DON't need a shield to operate a servo.
Just power the servo from an external 5volt/4A power supply,
and connect servo signal to an Arduino pin.
Remember to share grounds.
Leo..