Welcome to Raspberry Pi Pico 2 repository

5. PWM pin

1. Learning objectives

Learn to control LED lights with the Raspberry Pi Pico 2.
Understand the PWM output of the Raspberry Pi Pico 2.

2. Hardware construction

This course.

LED light*1

220Ω resistor*1

3. Program analysis

Thonny programming

For the use of ThonnyIDE, please refer to the previous environment construction related courses.


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import machine
import utime
led = machine.PWM(machine.Pin(15))
led.freq(1000)
while True:
    for i in range(65535):
        led.duty_u16(i)
        utime.sleep(0.0005)

import machine

The machine library contains all the instructions MicroPython needs to communicate with Pico and other MicroPython-compatible devices, extending the language of physical computing.

import utime

The "utime" library. This library handles everything to do with time, from measuring it to inserting delays into your program. The units are in seconds.

led = machine.PWM(machine.Pin(15))

Set IO15 to PWM output, that is, use the B output of PWM slice 7.

led.freq(1000)

Set the frequency to 1000 Hz - 1000 cycles per second.

led.duty_u16(i)

Set the duty cycle.

Through the While loop, modify the PWM duty cycle value through the for loop.

4. Experimental phenomenon

After the program is downloaded, we can see the process of the LED light slowly turning on from off.

Buzzer

Flash the onboard LED light