MagicCode Lesson 8: Generating Tones

MagicCode Lesson 8

Generating Tones

Generate tones using the onboard buzzer

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,

genearting 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.

https://github.com/Ruwatech/docu-Magicbit/blob/master/Resources/image2.png?raw=true

We could specify the frequency & duration of the tone with “play tone, [Frequency] Hz, duration: [Duration] ms” block.

Drag and Drop following blocks from block palette and create the following script.

Script

Explanation

This program starts by clicking the green flag. The forever block continuously runs the code held inside the block. Frequencies 4186 Hz and 5274 hz represent C and E notes respectively. This program play note C for 500ms and after that play E note 500 ms continuously.” play tone, [Frequency] Hz, duration: [Duration] ms” block generates pwm corresponding to the given parameters

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