Servo Tester and Centering Device

Servo Tester and Centering Device

Reusing old servos for RC and robotic projects I needed a way to confirm that they continued to work smoothly. I also needed a means to center them, in their range of travel, for project installation and hookup.
This Nano based tester provides for servo range of motion testing and aluminates a separate LED when the servo is in its centered position. Power is provided by a USB cable and power source connected directly to the Nano. Powering a single servo and LEDs though the Nano is not a problem.

List of Materials

• Arduino Nano
• 10k Potentiometer
• 2 – LEDS (power indication and servo centered)
• 2 – 200-ohm resisters
• 3 pin male servo connector
• 4 – M3 8mm screws
• 3-D print filament and printer

Wiring Connections

220-ohm resister:
• Negative (–) side of each LED

Nano 5V:
• Power LED +
• Servo Centered LED +
• Servo Connector +
• Potentiometer Side Connection +

Nano GRD:
• Servo Connector –
• Power LED resister