Build a "Go Away!" Robot - Easy Starter Project for Kids

Somebody trying to steal your stuff? Make a simple robot that will detect when they get too close and make a loud noise to scare them off!

Nov 11, 2019

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12 respects

kids

robots

Components and supplies

Arduino UNO

Solderless Breadboard Half Size

5 mm LED: Green

Buzzer, Piezo

Ultrasonic Sensor - HC-SR04 (Generic)

Project description

Code

Buzzer and LED Activated by Distance Sensor

arduino

Distance is in centimeters.

1#define trigPin 13
2#define echoPin 12
3#define buzzer 9 //buzzer  to arduino pin 9
4#define led 11
5
6
7
8void setup()
9{ Serial.begin  (9600);
10pinMode(trigPin, OUTPUT);
11pinMode(echoPin, INPUT);
12  pinMode(buzzer,  OUTPUT); // Set buzzer - pin 9 as an output
13  pinMode(led, OUTPUT);
14}
15
16void  loop()
17{ long duration, distance;
18digitalWrite(trigPin, LOW);
19delayMicroseconds(2);
20digitalWrite(trigPin,  HIGH);
21delayMicroseconds(10);
22digitalWrite(trigPin, LOW);
23
24duration  = pulseIn(echoPin, HIGH);
25distance = (duration/2) / 29.1;
26
27 if (distance  < 100)
28
29{ tone(buzzer, 98); // Send 1KHz sound signal...
30digitalWrite(led,HIGH);
31}
32
33else  {
34noTone(buzzer);
35digitalWrite(led,LOW);
36}
37
38Serial.print(distance);
39Serial.println("  cm");
40delay(500);
41}

#define trigPin 13
#define echoPin 12
#define buzzer 9 //buzzer  to arduino pin 9
#define led 11



void setup()
{ Serial.begin  (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
  pinMode(buzzer,  OUTPUT); // Set buzzer - pin 9 as an output
  pinMode(led, OUTPUT);
}

void  loop()
{ long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin,  HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration  = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;

 if (distance  < 100)

{ tone(buzzer, 98); // Send 1KHz sound signal...
digitalWrite(led,HIGH);
}

else  {
noTone(buzzer);
digitalWrite(led,LOW);
}

Serial.print(distance);
Serial.println("  cm");
delay(500);
}

Downloadable files

"Go Away!" Robot Diagram

A sketch, breadboard view of our set up for the Arduino and components.

"Go Away!" Robot Diagram

A sketch, breadboard view of our set up for the Arduino and components.

"Go Away!" Robot Diagram

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