Summary of Servo 360 rotation mod (Parallax)
This instructable explains how to modify a Parallax servo for continuous 360º rotation, ideal for robotics projects requiring full rotation servos. The process involves disassembling the servo, removing the potentiometer, and replacing it with two soldered 220Ω resistors to simulate its functionality. This modification allows the servo to rotate continuously and be controlled via digital pins, enhancing its usability in robotics. The guide includes step-by-step instructions, soldering tips, and precautionary notes for a successful mod.
Parts used in the Parallax Servo 360º Rotation Mod:
- Parallax servo
- Cutting pliers
- Screwdriver
- 2 x 220Ω resistors
- Soldering iron
- Desoldering pump
In this instructurable I will expalin and show you how to make a Parallax servo rotate 360º. And againI have search the internet to see tutorials clear enough to make this posible with no luck. Don’t get me wrong they are some how good but not clear. This mod will help you to use the mod servo for robots that need a fully 360º rotation servo. Also some of the pictures were taken from other instructurables and google to help new users understand this instructurable. This mod is useful for your robotics needs.
Enjoy 😉
Step 1: Materials
Parallax servo
Cutting pliers
Scewdriver
2X 220Omh resistors
Soldering iron
Desoldering pump.
Soldering iron.

Step 2: Step 1
2. Remove the four screws on the bottom of the servo and take off the bottom plate.
Step 3: Step 2
2. With a small screwdriver, carefully pry out the PC board motor control unit from the plastic case. It will be tight so go slowly. (Picture 2)
Step 4: Step 3
Put them together like the picture.
The two resistors will replace the potentiometer for the continuos rotation
Step 6: Step 4
In the Drawing you will see the resistors attached together were the potentiometer was installed.
2. Then cut the plastic mechanical stop.
The resistors will help the servo last longer. Also they are in place of the potentiometer so you can control the servo using the digital pins on the Arduino.