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Students will create a Scratch dance party, using the broadcast and receive command blocks to trigger the party to start!
OBJECTIVES
OBJECTIVES
OBJECTIVES: By the end of this lesson, students will understand that:
Broadcast is an Event Block.
Broadcast can trigger multiple sprites
Receive block is waiting for one particular broadcast message and will not react when other messages are broadcast.
TEACHER RESOURCES:
TEACHER RESOURCES:
Do Now (5 minutes)
Do Now (5 minutes)
Play the Broadcast and Receive game with your students! You can also make your own game using index cards.
Take-Aways:
One broadcast can trigger multiple sprites, in this case students.
Receive blocks only response when their unique message is broadcast. They do not respond to other broadcast messages.
Mini-Lesson (5-10 minutes)
Mini-Lesson (5-10 minutes)
Ask students to think back to Events they have used in scratch? Events trigger action and start code. Here are some examples.
Today students are going to use a new Event called broadcast.
Just like the DoNow game :
One broadcast can trigger multiple sprites.
Receive blocks only response when their unique message is broadcast. They do not respond to other broadcast messages.
PROJECT (20-30 minutes)
PROJECT (20-30 minutes)
Demo final Project of an example project that students will create.
Create a new project with two sprites.
Drag a broadcast command into the scripts area and show students how to create a new message name for a broadcast.
Broadcast from one sprite. Have the second sprite receive it.
It is helpful to show students how to drag a chunk of code from one sprite into another.
Go over checklist section on student handout or student page. Get students started in teams of two. Pair Programming.
Close-Out (5 minutes)
Close-Out (5 minutes)
Discuss the following questions:
How did you make all 4 sprites dance when only one sprite was clicked?
Why is Broadcast useful?
How can the sprite dance and play music at the same time?
Potential Responses
Potential Responses
The broadcast command sends a message to all sprites. Sprites waiting to receive that unique Broadcast message will then react.
Broadcast allows sprite to interact and send each other tiggers. It can be used as sprites can react together to a change eg. new level in a game.
Two scripts can work in parallel, one playing music the other doing controlling the dancing moves
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