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By Kevin McAleer, 3 Minutes
Welcome to Lesson 14 of the Raspberry Pi Pico with MicroPython - GPIO Mastery course. In this lesson, you will learn about servos and how to control them with the Raspberry Pi Pico and MicroPython. A servo is a small device that rotates to a specific position, making it ideal for controlling the movement of robots, drones, and other projects.
Raspberry Pi Pico with MicroPython - GPIO Mastery
A servo is a small motor that can be controlled to rotate to a specific position. It has three wires: power, ground, and signal. The power wire provides power to the servo, while the ground wire provides a common ground for the servo and the Raspberry Pi Pico. The signal wire is used to send a pulse-width modulation (PWM) signal to the servo to control its position.
To connect a servo to your Raspberry Pi Pico, you will need to connect its power wire to a 5V pin on the board, its ground wire to a GND pin on the board, and its signal wire to a PWM-enabled pin on the board. The signal wire is typically connected to pin GP18 on the Raspberry Pi Pico board.
To control a servo with MicroPython, you will need to use the machine.PWM module to generate the PWM signal that controls the servo’s position. Here’s an example of how to control a servo with MicroPython:
machine.PWM
from machine import Pin, PWM import utime # Initialize PWM on pin GP18 with a frequency of 50Hz servo = PWM(Pin(18)) servo.freq(50) # Set the servo to its minimum position servo.duty_u16(2500) utime.sleep(1) # Set the servo to its maximum position servo.duty_u16(12500) utime.sleep(1) # Set the servo to its middle position servo.duty_u16(7500) utime.sleep(1) # Stop the PWM signal servo.deinit()
In this example, we first initialize the PWM module on pin GP18 with a frequency of 50Hz. We then use the duty_u16 method to set the servo to its minimum, maximum, and middle positions. Finally, we stop the PWM signal using the deinit method.
duty_u16
deinit
In this lesson, you learned about servos and how to control them with the Raspberry Pi Pico and MicroPython. You also learned how to connect a servo to your board and how to write MicroPython code to control the servo’s position. You can use this knowledge to create a variety of projects that involve controlling the movement of robots, drones, and other projects using servos.
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