How it works

Published November 11, 2019 © GPL3+

The Simplest Alarm in the World Using Active Buzzer

This project is for beginners and is great for pranks.

BeginnerFull instructions provided26,602

The Simplest Alarm in the World Using Active Buzzer

Things used in this project

Hardware components

Arduino Nano R3

Jumper wires (generic)

Buzzer, Piezo

Breadboard (generic)

Software apps and online services

Arduino IDE

Story

This project is for the beginners in arduino who want to annoy people and also create something cool.

if you are a beginner in arduino and want to annoy your relatives or friends, this is the project for you I’ve also noticed that you can add it to any other project where you need to be alerted of something using the if() {} or while() {} statements (For example, a PIR motion sensor alarm)

All you need is any arduino board (i recommend an arduino uno or Nano) and an active buzzer. You can use wires or wire it directly to a Nano using a breadboard.

Then you upload the code that’s in the code section using arduino IDE..

How it works

all the arduino is doing is varying the voltage sent to PIN number 2. By using the analogWrite(value) function and the loop, we can slowly change the pitch and volume of the buzzer. since I am changing the pitch and sound super fast, it makes a really annoying alarm.

Code

Code

// words in the double slash are not part of the code

#define buzzer 2 //change to any output pin (not analog inputs) 

void setup() { //run this code once
  pinMode(buzzer, OUTPUT); //tell arduino the buzzer is an output device
}

void loop(){ //loop forever...
  
  for(int i=0; i<255; i++) { //do this 255 times
    analogWrite(buzzer, i); //raise the voltage sent out of the pin by 1
    delay(10); //wait 10 milliseconds to repeat 
  }

  for(int i=255; i>0; i--) { // do this 255 times
    analogWrite(buzzer, i); //lower the voltage sent out of the pin by 1
    delay(10); //wait 10 milliseconds to repeat
    
  }
}

Credits

arduino_uno_guy

1 project • 8 followers

The Simplest Alarm in the World Using Active Buzzer

Things used in this project

Hardware components

Software apps and online services

Story

How it works

Schematics

Wiring diagram

Code

Code

Credits

arduino_uno_guy

Comments

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The Simplest Alarm in the World Using Active Buzzer

The Simplest Alarm in the World Using Active Buzzer

Things used in this project

Hardware components

Software apps and online services

Story

How it works

Schematics

Wiring diagram

Code

Code

Credits

arduino_uno_guy

Comments

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