Controlling a single servo motor seems simple, but controlling several at once raises a completely different practical challenge: supplying enough current to run them all without overloading the Arduino board.
Components needed
An Arduino Uno board, four servo motors, an external power supply sized for all four motors' combined current draw, and connecting wires.
Wiring it up
The four motors' signal pins connect to four digital pins supporting PWM (pins 3, 5, 6, and 9 in this project). Their power pins, however, don't connect directly to the Arduino's 5V pin, since the board's onboard regulator can't supply enough current for four motors running together; a separate external power supply dedicated to just the motors is needed, with its ground tied to the Arduino's ground to keep a shared voltage reference between the two circuits.
How it works
The code relies on the same Servo library used with a single motor, but this time a separate Servo object is created for each of the four motors, with each one attached to its own pin via attach() in the setup function. In the main loop, all four motors move together in coordination: they all sweep gradually from 0 to 180 degrees, then back the other way, with a 10-millisecond delay between each step to ensure smooth, synchronized movement across all motors at once.
You can find servo motors and suitable power supplies at Juthour Tech.
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