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Project #5

Alien Signals

Bring sounds of the extra-terrestrial to your very own home with this invention! Who knows where they come from - a UFO, or maybe an alien? Regardless, they're great sci-fi fun.

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Begin with this video

The Kit

The Amazing Annoyatron

Build this invention, and many more, with The Amazing Annoyatron!

What you’ll need


Brain Board



Step 1

Let’s build this!

Ticking Clock Diagram
This is the positive leg of the buzzer. It will have a ‘+’ sign on top of it and will also be longer than the other leg.
Don’t forget to plug the board into your computer with the included USB cable.



The +LEG is the longer leg.

+ LEG11

Step 2

Code some chaos!

Don’t forget to select your port, like ususal

Copy and paste the sample code

int buzzer = 11;

int beepTone = 10; // The sound of the beeps
int beepLength = 5; // The length of the beeps

void setup() {
  // put your setup code here, to run once:
   pinMode(buzzer, OUTPUT);

void loop() {
  // put your main code here, to run repeatedly:
  tone(buzzer,random(1,beepTone * 1000),beepLength * 2);
  delay(beepLength * 2);
  tone(buzzer,random(1,beepTone * 1000),beepLength * 20);
  delay(beepLength * 20);

Upload the code and test it out

Step 3

Modify the Madness!

Change the sound of the beeps

Like in a lot of other projects we’ve built, you are able to change the sound of the beeping noises. Take a look on line 3 where we can make the beep pitch either higher or lower:

int beepTone = 10; // The sound of the beeps

Have a play around with this value and try to find the most annoying number. Note that any number over 32 will not work, but apart from that, have fun!

Change the length of each beep

At the moment, the ‘alien’ beeping is just a fast jumble of random tones. Fancy making this jumble more hectic? Want to slow it down just a notch? Line 4 is where you can change this and set exactly how long each beep goes for.

int beepLength = 5; // The length of the beeps

In the demo program, the beep length is set to 10. If we decrease this number, our beeps will get shorter and sound more jumbled. A good number to try to test this is 1. If we increase this number, our beeps will get longer and will sound less and less like alien signals – though still equally as annoying. Another good number to try is 25.

int beepDelay = 25; // The length of the beeps