Safety Sensor

The main idea: The main idea of this project is to avoid invasions in your house, so you can enjoy life safer. You can install this anywhere you want like a garage, a room, a locker etc.

How does it work? Basically, when you open the door the buzzer will start, it works because there is a sensor and when there is nothing blocking the sensor up until 35cm it is programmed to start buzzing. But, when you close the door the buzzer will stop.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: What Will You Need:

A sensor, A breadboard, Jumper wires, Buzzer, Arduino board, Button, Resister 10K, A computer with Arduino install and a USB cable

Step 1- First of all, you need to get all your materials to start this project.

Step 2: Building

Then, you get the breadboard and the Arduino board and places the jumper wires, the button, sensor, resister 10k and the button. It should look like the photo

Observation- If you press the button it will stop buzzing for 10 seconds

Step 3: Plugging

Step 3- Plug the one side of the USB cable to the Arduino board and the other side to your computer

Step 4: Code

Open Arduino in your computer and put this code in it: Step 4- Open Arduino in your computer and put this code in it:

* Ultrasonic Sensor HC-SR04 and Arduino Tutorial
* by Dejan Nedelkovski,
// defines pins numbers
const int trigPin = 9;
const int echoPin = 10;
const int buzzPin = 2;
const int button1 = 3;
int making =0;
// defines variables
long duration;
int distance;
void setup() {
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
pinMode(buzzPin, OUTPUT);
pinMode (button1, INPUT); 
Serial.begin(9600); // Starts the serial communication
void loop() {
// Clears the trigPin
digitalWrite(trigPin, LOW);
// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
digitalWrite(trigPin, LOW);
// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);
// Calculating the distance
distance= duration*0.034/2;
// Prints the distance on the Serial Monitor
Serial.print("Distance: ");
making = digitalRead(button1);
  digitalWrite(buzzPin, HIGH);
  if (making == HIGH) {
   digitalWrite(buzzPin, LOW);
} else {
  digitalWrite(buzzPin, LOW);

Be the First to Share


    • Made with Math Contest

      Made with Math Contest
    • Multi-Discipline Contest

      Multi-Discipline Contest
    • Robotics Contest

      Robotics Contest