pxt-calliope/olddocs/js/guides/blink-symbols.md

blink symbols.

Challenge 0

You have successfully following the blink tutorial. If not, then let's start the tutorial now. Your @boardname@ 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 @boardname@.

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