Micropython Lesson 5: Generating Tones

Micropython Lesson 5

Generating Tones

Generate a tone on the onboard Buzzer from square waves

Components Required

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Introduction

In this example, you are learning to generate a tone using the onboard buzzer on the Magicbit.

Learning Outcomes

From this example, you’ll get an understanding about,

generating square waves

Theory

Piezo buzzers are commonly used in embedded systems to give audible tones. It works well with a square wave as input.

Methodology

For this example, we use the piezo buzzer wired to pin 25 of the Magicbit.

Code

from machine import Pin,PWM
import time
BUZZER=Pin(25, Pin.OUT)
while True:
      BUZZER.on()
      time.sleep_ms(300)
      BUZZER.off()
      time.sleep_ms(300)

Explanation

There is no function for MicroPython to generate a square wave to activate the buzzer. Therefore, we should create a square wave to replicate the tone function used in Arduino.

Activity

Note:: Create a program that plays one frequency when one push button on the board is pressed, and another frequency when the other push-button when pressed.