PIR motion sensing

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Introduction

PIR sensors are great for detecting motion and they are easy to use with CodeBug.

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Setting up digital inputs

To read the value of a PIR sensor, we need to set up CodeBug to read a digital value.

• First click on the blue cog on the start block and tick the checkbox next to extension pins input/output.

• Click the cog again to close this window.

• Select digital input from the leg 6 as dropdown menu on the start block.

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Looping

• Now from the Loops menu, drag in a repeat while true loop and snap it below your start block.

This will allow you to read PIR sensor more than once.

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Sensing movement

• From the If menu, drag in an if block and snap it inside your repeat while true loop.

• From the Logic menu, drag in an equals (=) block and snap it to the puzzle piece of your if block.

• From the Inputs/Outputs menu drag in a get leg/pin block and snap it into the first gap of your equals block.

• Click on the number block inside your get leg/pin block and change the number to 6.

• From the Maths menu drag in a number 1 block and snap it into the second gap of your equals block.

This will code will check if the PIR sensor has registered movement.

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Displaying a message

When motion is sense, we need to display a message

• From the Sprite menu drag in a scroll sprite block and snap it inside your if block.

• Again from the Sprite menu drag in a get string sprite block and snap it to the puzzle piece of your scroll sprite block.

• Click on the Hello world text of your get string sprite block and change it to "Intruder".

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Download your code

• Click Download to download your code.

• Load your code onto your CodeBug.