Tag Archives: sg90 servo

Bodgers – Servos

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This week we will connect a SG90 mini servo to our Pico.

Wire the breadboard as shown below:

First test that the buttons are working correctly with the following code.

from machine import Pin
from time import sleep

button_1 = Pin(18, Pin.IN, Pin.PULL_UP)
button_2 = Pin(19, Pin.IN, Pin.PULL_UP)

while True:
    if button_1.value() == 0:
        print("Button 1 is Pressed")
    if button_2.value() == 0:
        print("Button 2 is Pressed")
    sleep(0.1)

Next here is the code for the Servo.

from machine import Pin, PWM
from time import sleep

servo_pin = PWM(Pin(0))
servo_pin.freq(50)

def servo(degrees):
    if degrees > 180:
        degrees = 180
    if degrees < 0:
        degrees = 0
       
    max_duty = 8050
    min_duty = 1650
       
    new_duty = (min_duty + (max_duty - min_duty) * (degrees/180))
    servo_pin.duty_u16(int(new_duty))

servo(0)
sleep(0.5)
servo(90)
sleep(0.3)
servo(180)
sleep(0.3)

This weeks challenge is to combine both pieces of code above so that when button 1 is pressed the servo arm will move one way and when button 2 is pressed it will move in the opposite direction.