Making Laptop Touch Pad with Ultrasonic Sensors HCSR-04

This is a kind of position sensor. Made from 2 Ultrasonic sensors, placed at 90° to each other. Can be used to get cartesian coordinates.

Dec 9, 2021

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Components and supplies

Ultrasonic Sensor - HC-SR04 (Generic)

Arduino UNO

USB-A to Mini-USB Cable

Jumper wires (generic)

Tools and machines

Scissor, Electrician

Apps and platforms

Arduino IDE

Project description

Code

Arduino Interfacing with two Ultrasonic Sensors

arduino

Arduino Interfacing with two 2 Ultrasonic Sensors

1const int t1 = 2;
2const int e1 = 3;
3
4const int t2 = 6;
5const  int e2 = 7;
6
7void setup() {
8  pinMode(t1,OUTPUT);
9  pinMode(e1,INPUT);
10  
11  pinMode(t2,OUTPUT);
12  pinMode(e2,INPUT);
13  Serial.begin(9600);
14}
15void  loop(){
16  ultrasonic();
17  }
18  
19void ultrasonic() {
20  long duration,  cm1, cm2;
21
22  digitalWrite(t1, LOW);
23  delayMicroseconds(2);
24  digitalWrite(t1,  HIGH);
25  delayMicroseconds(5);
26  digitalWrite(t1, LOW);
27
28  duration  = pulseIn(e1, HIGH);
29
30  cm1 = duration/29/2;
31
32  Serial.print("Coordinates  of detected object : ");
33  Serial.print(cm1);
34  Serial.print(",");
35
36
37  digitalWrite(t2, LOW);
38  delayMicroseconds(2);
39  digitalWrite(t2, HIGH);
40  delayMicroseconds(5);
41  digitalWrite(t2, LOW);
42
43  duration = pulseIn(e2,  HIGH);
44
45
46  cm2 = duration/29/2;
47
48  Serial.print(cm2);
49  Serial.println();
50
51  delay(500);
52}

const int t1 = 2;
const int e1 = 3;

const int t2 = 6;
const  int e2 = 7;

void setup() {
  pinMode(t1,OUTPUT);
  pinMode(e1,INPUT);
  
  pinMode(t2,OUTPUT);
  pinMode(e2,INPUT);
  Serial.begin(9600);
}
void  loop(){
  ultrasonic();
  }
  
void ultrasonic() {
  long duration,  cm1, cm2;

  digitalWrite(t1, LOW);
  delayMicroseconds(2);
  digitalWrite(t1,  HIGH);
  delayMicroseconds(5);
  digitalWrite(t1, LOW);

  duration  = pulseIn(e1, HIGH);

  cm1 = duration/29/2;

  Serial.print("Coordinates  of detected object : ");
  Serial.print(cm1);
  Serial.print(",");


  digitalWrite(t2, LOW);
  delayMicroseconds(2);
  digitalWrite(t2, HIGH);
  delayMicroseconds(5);
  digitalWrite(t2, LOW);

  duration = pulseIn(e2,  HIGH);


  cm2 = duration/29/2;

  Serial.print(cm2);
  Serial.println();

  delay(500);
}

Downloadable files

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