005 - ESP32 MicroPython: Pulse Width Modulation

Sep 13, 2020 · 2 min read · esp32 micropython esp32 pwm Micropython esp32 ·

Introduction

In this tutorial, we will learn to use the PWM of ESP32 in MicroPython. PWM stands for Pulse Width Modulation.

Circuit Diagram

Video Demonstration

Call To Action

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Source Code

 1# DC motor speed control using PWM in MicroPython
 2# Author: George Bantique, TechToTinker
 3# Date: September 13, 2020
 4
 5# Load the machine module which also
 6# includes the pwm class
 7import machine
 8
 9# Create the drives object for the direction
10# of rotation of the DC motor
11dr1 = machine.Pin(21, machine.Pin.OUT)
12dr2 = machine.Pin(19, machine.Pin.OUT)
13
14# Create the en1 object as normal GPIO
15en1 = machine.Pin(18, machine.Pin.OUT)
16
17# Create a pwm object and attach it to
18# pwm drivers
19pwm = machine.PWM(en1)
20
21# Rotates the DC motor clockwise
22def cw():
23    dr1.value(1)
24    dr2.value(0)
25    
26# Rotates the DC motor counter-clockwise    
27def ccw():
28    dr1.value(0)
29    dr2.value(1)
30
31# Starts the pwm with a definite value
32# and start the motor rotating according 
33# to the input argument
34def start(rotation):
35    pwm.init(freq=1, duty=512)
36    if (rotation=='cw'):
37        cw()
38    elif (rotation=='ccw'):
39        ccw()
40
41# Stops the pwm using pwm.deinit() function
42# which dettach the pwm driver to the en1 object
43# We also provide the drives pin a logic low value
44def stop():
45    pwm.deinit()
46    dr1.value(0)
47    dr2.value(0)
48