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• The micro:bit will show a heart image that changes size—getting big and
small—making it look like it’s beating.

• You can see how coding makes the heartbeat continuously, like a real heart

pumps blood.
You will understand how to create moving pictures (animations) using simple

computer code.

Application

You may have noticed the heartbeat animation on
a smart watch when using the heart monitoring
function. This animation visually represents

your pulse, syncing with the beats detected by
the watch’s sensors.

Understanding Variables in Programming

Variable: A variable in programming is like a

special container that holds information, such as

numbers, words, or data. Think of it as a labelled
box where you store something you want to use

later. In coding, variables can store values that

can change while the program is running.

• This program uses a variable called ‘count’ to
keep track of the number you’re counting.

• It sets the variable to 0 at the start.

• Every time you press button B, it increases the count variable by 1 and shows

it on the LED display.

• Numbers over 9 won’t stay on the display, so pressing button A shows the

number.
• You can reset the counter by pressing buttons A and B together.

Programming with Micro:bit 61