1.5 Wake up the Owl¶
Today we are going to play a game of waking up the owl.
When someone approaches the PIR sensor module, the owl will wake up from sleep.
Build the Circuit¶
There are two potentiometers on the PIR module: one is to adjust sensitivity and the other is to adjust the detection distance. To make the PIR module work better, you You need to turn both of them counterclockwise to the end.
Load the Code and See What Happens¶
Load the code file (
1.5_wake_up_the_owl.sb3) to Scratch 3.
When you approach the PIR sensor module, you will see the owl on the stage area open its wings and wake up, and when you leave, the owl will go back to sleep again.
Tips on Sprite¶
Select Sprite1 and click Costumes in the top left corner; upload owl1.png and owl2.png from the
home/pi/raphael-kit/scratch/picture path via the Upload Costume button; delete the default 2 costumes, and rename the sprite to owl.
Tips on Codes¶
When the green flag is clicked, the initial state of gpio17 is set to low.
When pin17 is low (no one is approaching), switch the costume of the owl sprite to owl1 (sleeping state).
When pin17 is high (someone is approaching), we switch the costume of owl sprite to owl2 (wake up state).