Intruder Security Alarm using Vibration Sensor

Introduction

In today’s tutorial, I will show you how to make an Intruder security alarm using a vibration sensor and Attiny85. You can implement this system in your vehicles so as any intruder or someone tries to sit on your bike, it will create some vibration and the alarm will start buzzing with flashing led.

Working of Intruder security Alarm

In this project, we will connect the vibration sensor to the Digispark Attiny85. When there is no vibration, the output of the vibration sensor is 0 (low voltage), Else the output is 1 (High Voltage). If Attiny85 gets 1 output from the vibration sensor, it will turn on Buzzer and LED.

Components Required

So let’s get started making Intruder security Alarm using a vibration sensor. To make this system more compact, I am using Digispark Attiny85. Following are the lists of all the components that are required for building this project. 

S.N	Components Name	Description	Quantity
1	DigiSpark Attiny85 Board	DigiSpark Attiny85 Arduino Compatible Board	1	https://amzn.to/32km6UD
2	Vibration Sensor	Vibration Sensor	1	https://amzn.to/3v2Addj
3	Buzzer	Small 2 pin Buzzer	1	https://amzn.to/2OKdkvv
4	LED	5 Mm RED LED	1	https://amzn.to/3cwvtoG
5	Jumper Wires	Jumper Cables breadboard friendly	5	https://amzn.to/2JWSR44
6	Breadboard	Mini Breadboard	1	https://amzn.to/2NP2UKL

Interface Vibration Sensor, Buzzer, & LED with Attiny85

Now. let’s learn to interface Vibration sensors, Buzzer, & LED with Digispark Attiny85.

I assemble the circuit in a breadboard, but you can order a custom PCB from pcbway.com. It is one of the most trusted PCB and PCB assembly manufacturers. They produce high-quality PCBs at a reasonable price, only $5 for 10 PCBs and $30 for 20 PCB assembly. Besides, new members also receive a $5 bonus.

The circuit connection is fairly simple. Connect the Ground pin of the Vibration sensor, buzzer, and LED to the GND pin of Attiny85. Now, connect the VCC pin of the vibration sensor to the 5Volt pin. Similarly, D0 (signal) pin to P2 pin of Attiny85. Lastly, connect the buzzer positive pin to P3 and the LED positive pin to the P1 pin of Digispark Attiny85. You can follow the schematics and table below to assemble the circuit. 

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Program code

I will explain each and every step of the program code so that it will help you to understand and modify it according to your requirements. First, we defined the variable “Buzz” for the buzzer, “vs” for vibration sensor, and “LED” for Red LED with their interfaced pin with Attiny85. 

int Buzz = 3; //Buzzer
int LED = 1;  //LED
int vs =2; // vibration sensor
int i=0;

In a void setup, we have defined the pinMode function for all the components

void setup(){
  pinMode(Buzz, OUTPUT);
  pinMode(LED, OUTPUT);
  pinMode(vs, INPUT); 
}

Here, in a loop, the program reads the data from the vibration sensor, if there a vibration the result is High. In this condition, Buzzer and LED are turned ON.

void loop(){
int vib = digitalRead(vs);
  if(vib == HIGH)
  {
    for(i=0;i<10;i++)
    {
    digitalWrite(Buzz, HIGH);
    digitalWrite(LED, HIGH);
    delay(500);
    digitalWrite(Buzz, LOW); 
    digitalWrite(LED, LOW); 
    delay(100);
  }
  }

Else the buzzer and LED remains in an OFF state

else{
    digitalWrite(Buzz, LOW);
    digitalWrite(LED, LOW); 
  }
}

Intruder Security Alarm Final Program code

This is the final program code for Intruder security Alarm using vibration sensor and Attiny85 board. Copy this code and paste it in your Arduino IDE.

//The IoT Projects: https://theiotprojects.com 
//Attiny85 Intruder Security Alarm using Viabration Sensor
// Using Digispark ATTINY85

int Buzz = 3; //Buzzer
int LED = 1;  //LED
int vs =2; // vibration sensor
int i=0;
void setup(){
  pinMode(Buzz, OUTPUT);
  pinMode(LED, OUTPUT);
  pinMode(vs, INPUT); 
}
void loop(){
int vib = digitalRead(vs);
  if(vib == HIGH)
  {
    for(i=0;i<10;i++)
    {
    digitalWrite(Buzz, HIGH);
    digitalWrite(LED, HIGH);
    delay(500);
    digitalWrite(Buzz, LOW); 
    digitalWrite(LED, LOW); 
    delay(100);
  }
  }
  else{
    digitalWrite(Buzz, LOW);
    digitalWrite(LED, LOW); 
  }
}

Uploading code & testing project:

Before uploading the code, make sure you have set up your Arduino IDE for the Digispark Attiny85 board.

Now copy the program code provided for the Intruder security Alarm using vibration sensor from above. Select “Digispark (Default-16.5Mhz)” Board from Tools Menu. Also, select programmer as “Micronucleus” and choose its COM port.

Finally, press the upload button after compiling the code, connect your Digispark Attiny85 board within 60 seconds. Wait for “Micronucleus done. Thank you!” Message for the successful upload of the program. 

Now it’s time to test the Intruder security Alarm using vibration sensor project. Gently shake the vibration sensor and you will start getting feedback from the buzzer and LED.

Conclusion

So, that’s all for this Intruder security Alarm using vibration sensor project using Attiny85. This is a very useful project and has a wide range of applications in the security field. If you like this tutorial, then share this project with your friends. Need help? Comment down below.