Introduction
Connect four Pushbuttons to a Bit Board and control a Piezo with code.
We'll explore how we can make sounds using a piezo speaker with four buttons.
Video Overview
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We'll use Maker Tape to connect the four Buttons and the Piezo to the Bit Board on a LEGO baseplate.
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Connect Buttons to Pin 1, Pin 2, Pin 3, and Pin 4. Each will also connect to Ground (GND).
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The Piezo will connect to Pin 8 and to Ground (GND).
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You'll notice the Ground on the Bit Board (as well as the Piezo, Buttons, and other Crazy Circuits components we'll use) is color coded White.
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If you've never used a micro:bit before you'll want to check out this guide: Bit Board V2 Setup and Use
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We're going to load the following code for our Piezo Siren Function program: https://makecode.microbit.org/_gVL7LmV7j...
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The micro:bit (since the release of version V2) has included a built-in piezo speaker on the back. You can use the built-in Piezo on a V2 micro:bit or connect a Crazy Circuits Piezo with Maker Tape as we've shown in this guide.
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We will still play a unique siren sound with each button press, but this time we'll use a function we can easily call with different parameters.
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Functions are a great way to make modular code and prevent having to use many blocks of code that are the same except for the values.
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Once the code is loaded it should start running immediately.
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You can power the micro:bit via the USB cable you used to load the code or you can use a battery pack plugged into the Bit Board.
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Each button will play a different siren sound with slightly different parameters. (Thanks to our playSound function!)
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Follow along with our recorded Live Stream!
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You can watch the full video of us walking through this project, along with explaining and exploring the code: https://youtube.com/live/c5Dt9VZ0Rnk
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Attached Documents
