Make a Card 1. Fold the card in

Make a Card 1. Fold the card in half 2. Glue the backs together 3. Cut along the dashed line Stopwatch Cards Stopwatch Cards Use these cards in this order: 1. Create a Variable 2. Start the Clock 3. Stop and Reset 4. Get Moving 5. Time the Sprite 6. Background Effects microbit.org/scratch microbit.org/scratch Inspired by Scratch Cards created by Natalie Rusk scratch.mit.edu/cards 1. Fold the card in half Make a Card Create a Variable 2. Glue the backs together 3. Cut along the dashed line Create a Variable

microbit.org/scratch GET READY Add a changeable value on the screen. Choose in the Blocks Palette. Add a checkmark to your variable to make it appear on the screen. ADD THIS CODE TRY IT Click the A button to advance the number on the screen. microbit.org/scratch 1 Inspired by Scratch Cards created by Natalie Rusk scratch.mit.edu/cards 1. Fold the card in half Make a Card Start the Clock 2. Glue the backs together 3. Cut along the dashed line Start the Clock microbit.org/scratch GET READY

Add a loop to increase the time on the clock. A stopwatch should advance each second. A forever loop will increase the time as long as the program is running. ADD THIS CODE TIME will increase by 1 each second. TRY IT Test your timer against a clock. microbit.org/scratch 2 Does the time change each second? Inspired by Scratch Cards created by Natalie Rusk scratch.mit.edu/cards 1. Fold the card in half Make a Card Stop and Reset 2. Glue the backs together 3. Cut along the dashed line Stop and Reset microbit.org/scratch

GET READY Control your stopwatch with the A and B buttons. Add a RESET and a STOP code. ADD THIS CODE TIME will return to 0 each time the A button is pressed. A B TRY IT Click each button on the micro:bit and see how they affect the time displayed on screen. microbit.org/scratch 3 CHALLENGE: Can you change your stopwatch into a countdown clock? Inspired by Scratch Cards created by Natalie Rusk scratch.mit.edu/cards 1. Fold the card in half Make a Card Get Moving 2. Glue the backs together 3. Cut along the dashed line

Get Moving microbit.org/scratch GET READY Make your sprite move as your stopwatch advances! Click the tab. Choose a sprite. Make sure your sprite has more than one costume. ADD THIS CODE TRY IT What happens when your sprite reaches the end of the screen? microbit.org/scratch 4 Add these codes into the loop to fix the problem! Inspired by Scratch Cards created by Natalie Rusk scratch.mit.edu/cards 1. Fold the card in half Make a Card Time the Sprite 2. Glue the backs together 3. Cut along the dashed line

Time the Sprite microbit.org/scratch GET READY Let Scratch decide how many seconds your sprite will move. Use your stopwatch to figure it out. Start your sprite with the A button. This will make the stopwatch and the sprite move at the same time. ADD THIS CODE Let Scratch decide how long the code will run. Change the number to affect the sprites speed. TRY IT How long did the sprite move? microbit.org/scratch 5 Freeze the clock by pushing the B button on the micro:bit when the sprite stops. Inspired by Scratch Cards created by Natalie Rusk scratch.mit.edu/cards 1. Fold the card in half

Make a Card Background Effects 2. Glue the backs together 3. Cut along the dashed line Background Effects microbit.org/scratch GET READY Use graphic effects to alter your background as the program runs. Choose a background . Click the Backdrops tab. ADD THIS CODE TRY IT Experiment with other background effects. microbit.org/scratch 6 CHALLENGE: Reset your graphic effect. Where should this block go in your code? Inspired by Scratch Cards created by Natalie Rusk scratch.mit.edu/cards