Controlling a 9g Servo Motor with Raspberry Pi Pico

To control the position of a 9g servo motor using the PWM output of Raspberry Pi Pico and change its angle when a push-button is pressed.

Buy Basic Raspberry Pi Pico Kit

Items Required:

Raspberry Pi Pico 1
9g Servo Motor (SG90 or similar) 1
Push Button 1
330O Resistor (for button debouncing, optional) 1
Breadboard 1
Jumper Wires As needed
USB Micro B Cable 1
External Power Source (5V, optional) 1 (if needed)

Note: For longer runtimes or under load, power the servo from external 5V and connect GND to Pico’s GND to avoid current issues.

Connections:

Code:

from machine import Pin, PWM
from time import sleep

# Set up PWM Pin for servo control
servo_pin = machine.Pin(0)
servo = PWM(servo_pin)

# Set Duty Cycle for Different Angles
max_duty = 7864
min_duty = 1802
half_duty = int(max_duty/2)

#Set PWM frequency
frequency = 50
servo.freq(frequency)

try:
    while True:
        #Servo at 0 degrees
        servo.duty_u16(min_duty)
        sleep(2)
        #Servo at 90 degrees
        servo.duty_u16(half_duty)
        sleep(2)
        #Servo at 180 degrees
        servo.duty_u16(max_duty)
        sleep(2)    

except KeyboardInterrupt:
    print("Keyboard interrupt")
    # Turn off PWM 
    servo.deinit()

Download code:

Result:
When the code runs, the servo rotates to 0°, pauses, then to 90°, pauses, and finally to 180°, and keeps repeating this cycle.