pxt-calliope/docs/lessons/strobe-light/activity.md
2016-03-25 16:47:20 -07:00

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# strobe light activity
Develop shapes with a for loop.
### ~avatar avatar
### @video td/videos/strobe-light-0
Welcome! This guided tutorial will teach how to develop shapes with a for loop. Let's get started!
### ~
Create a `for loop` that will loop from 0 to 4 to indicate the x-coordinates of the micro:bit display.
```blocks
for (let i = 0; i < 5; i++) {
}
```
Create another for loop that will loop from 0 to 4, indicating the y-coordinates of the micro:bit instead. This for loop will light each LED by column.
```blocks
for (let i = 0; i < 5; i++) {
for (let j = 0; j < 5; j++) {
}
}
```
We will light up each LED by plotting them individually.
```blocks
for (let i = 0; i < 5; i++) {
for (let j = 0; j < 5; j++) {
led.plot(i, j)
basic.pause(200)
}
}
```
The pause will add a delay between lighting each LED.
![](/static/mb/blocks/lessons/strobe-light-3.jpg)
### ~avatar avatar
Excellent, you're ready to continue with the [challenges](/microbit/lessons/strobe-light/challenges)!
### ~