pxt-calliope/docs/projects/flashing-heart.md

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![](/static/mb/projects/a1-display.png)
Use the LEDs to display a flashing heart.
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## Step 1
Use [show leds](/reference/basic/showLeds) and make your code look like this:
```blocks
basic.showLeds(`
. # . # .
# # # # #
# # # # #
. # # # .
. . # . .`);
```
## Step 2
Add a [pause](/reference/basic/pause) to wait and [clear screen](/reference/basic/clearScreen) to turn off the LEDs.
```blocks
basic.showLeds(`
. # . # .
# # # # #
# # # # #
. # # # .
. . # . .`);
basic.pause(500);
basic.clearScreen();
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```
## Step 3
Put a [forever loop](/reference/basic/forever) around it.
```blocks
basic.forever(() => {
basic.showLeds(`
. # . # .
# # # # #
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# # # # #
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. # # # .
. . # . .`);
basic.pause(500);
basic.clearScreen();
})
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```
## Step 4
Add a [pause](/reference/basic/pause) to wait after clearing the screen.
```blocks
basic.forever(() => {
basic.showLeds(`
. # . # .
# # # # #
# # # # #
. # # # .
. . # . .`);
basic.pause(500);
basic.clearScreen();
basic.pause(500);
})
```
## Step 5
Add a second image of a broken heart.
```blocks
basic.forever(() => {
basic.showLeds(`
. # . # .
# # # # #
# # # # #
. # # # .
. . # . .`);
basic.pause(500);
basic.clearScreen();
basic.pause(500);
basic.showLeds(`
. # . # .
# . # # #
# . . . #
. # # # .
. . # . .`);
basic.pause(500);
basic.clearScreen();
basic.pause(500);
})
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```