pxt-calliope/docs/reference/js/guides/blink-symbols.md
2016-04-13 08:27:45 -07:00

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# blink symbols.
### Challenge 0
You have successfully following the [blink tutorial](/hcwxud). If not, then let's start the tutorial now. Your micro:bit script should start by displaying a blinking script on screen. We want to plot the x and y coordinates to 2, 2. Additionally, you will pause by 100 milliseconds then clear the screen of the micro:bit.
Let's give it a go!
```
while (true) {
led.plot(2, 2)
basic.pause(200)
basic.clearScreen()
basic.pause(200)
}
```
### Challenge 1
Make a `>` greater than symbol. Start in the upper left corner of the simulator when you plot coordinates. Make sure to add the line of code `led->plot (0,0)` under the last line of code
```
while (true) {
led1.plot(2, 2)
basic1.pause(200)
basic1.clearScreen()
basic1.pause(200)
led1.plot(0, 0) // ***
}
```
Design the top half of the `>` symbol by connecting a LED to the original center coordinate `2,2` and the upper left coordinate `0,0` Make sure to add the line of code `led->plot (1,1)` under the last line of code
```
while (true) {
led2.plot(2, 2)
basic2.pause(200)
basic2.clearScreen()
basic2.pause(200)
led2.plot(0, 0)
led2.plot(1, 1) // ***
}
```
Awesome! You have designed half of the `>` symbol. Now we should finish the lower half of the `>` symbol
* tap the `run` button to view the updated script on the simulator
Add the bottom half of the `>` symbol by plotting the most bottom - left LED first. Make sure to add the line of code `led->plot (0,5)`
```
while (true) {
led3.plot(2, 2)
basic3.pause(200)
basic3.clearScreen()
basic3.pause(200)
led3.plot(0, 0)
led3.plot(1, 1)
led3.plot(0, 4) // ***
}
```
Awesome! Now we must connect a LED to the original center coordinate `2,2` and the lower left coordinate `0,5` Make sure to add the line of code `led->plot (1,4)`
Your `main` function should look like this:
```
while (true) {
led4.plot(2, 2)
basic4.pause(200)
basic4.clearScreen()
basic4.pause(200)
led4.plot(0, 0)
led4.plot(1, 1)
led4.plot(0, 4)
led4.plot(1, 3) // ***
}
```
* `run` the script and see that the program works as expected
Congratulations! You made a `>` symbol.
### Challenge 2
Use `led->plot` to create a exclamation design `!` Your `main` function should look like this. (notice the notation of `...` represents previous code in **Challenge 0** and **Challenge 1**
Make sure to add these lines of code within the `while` loop
Your `main` function should look like this:
```
while (true) {
// ...
led5.plot(4, 0) // ***
led5.plot(4, 1) // ***
led5.plot(4, 2) // ***
led5.plot(4, 4) // ***
}
```
* run the code and see that it works as expected.
### Challenge 3
Use the same logic `led->plot` to turn on all the LED lights!!!
* run the code and see that it works as expected