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Servo

Introduction

In this project, we will learn how to control a servo motor using a Raspberry Pi. Servo motors are commonly used in robotics and automation for precise control of angular motion.

Circuit Diagram

The circuit diagram below shows the connections required for controlling the servo motor.

Wiring Diagram

Code

The following Python code demonstrates how to control the servo motor by moving it between various angles:

from fusion_hat.servo import Servo   # Import the Servo class for controlling servos
from time import sleep               # Import sleep for timing delays

servo = Servo(0)                     # Create a Servo object on channel 0

while True:                          # Loop forever
   # Sweep from -90° to +90° in steps of 10°
   for i in range(-90, 91, 10):
      servo.angle(i)               # Set servo to angle i
      sleep(0.1)                   # Small delay for smooth movement

   # Sweep back from +90° to -90° in steps of -10°
   for i in range(90, -91, -10):
      servo.angle(i)               # Set servo to angle i
      sleep(0.1)                   # Small delay for smooth movement

This Python script controls a servo motor connected to PWM 0. When executed:

The servo moves from -90 degrees to 90 degrees in 10-degree increments.
It pauses for 0.1 seconds between each movement.
It then reverses the direction and moves from 90 degrees to -90 degrees in 10-degree increments.
The process repeats indefinitely.