Hey All,
I had a project with arduino and HC-SR04 sensor .
The aim is to measure the distance and set an alert system off .
But each time my object goes far than 60 cm the alert system fails .
The serial monitor displays a distance less by almost 10 cm ,which in turn give's out wrong alert .
My code is below (Most of the code was done by me ,I know C / C++)
#define trigPin 7 //TRIG INPUT
#define echoPin 6 //ECHO OUTPUT
#define led 13 //LED BLUE
#define led2 12 //LED BLUE
#define led3 11 //LED YELLOW
#define led4 10 //LED YELLOW
#define led5 9 //LED RED
#define led6 8 //LED RED
#define buzzer 3 //BUZZER
// Project Work on Distance Measurment Using HC-SR04 Sensor
// Compiled By Febin K Philip
// Febkosq8
int sound = 150;
void setup() {
Serial.begin (19200); //Opens Serial Port at 19200
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(led, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
pinMode(led6, OUTPUT);
pinMode(buzzer, OUTPUT);
}
int count=5;
void loop() {
long duration, distance;
digitalWrite(trigPin, LOW); //Set the trig pin to LOW state
delayMicroseconds(2); //Halt the program for specified microseconds
digitalWrite(trigPin, HIGH); //Set the trig pin to HIGH state
delayMicroseconds(10); //Halt the program for specified microseconds
digitalWrite(trigPin, LOW) ; //Set the trig pin to LOW state
duration = pulseIn(echoPin, HIGH); //Finding the duration taken by the wave in traveling
distance = (duration/2) / 29.1; //Finding the distance using the extracted data and eqn
if(count%5 == 0)
{
Serial.println("\n:) Program Compiled By Febkosq8 (:\n");
}
count=count+1;
if (distance <= 60) { //Conditions for the program to trigger the alert system
digitalWrite(led, HIGH);
sound = 50;
}
else {
digitalWrite(led,LOW);
}
if (distance < 50) { //Conditions for the program to trigger the alert system
digitalWrite(led2, HIGH);
sound = 200;
}
else {
digitalWrite(led2, LOW);
}
if (distance < 40) { //Conditions for the program to trigger the alert system
digitalWrite(led3, HIGH);
sound = 350;
}
else {
digitalWrite(led3, LOW);
}
if (distance < 30) { //Conditions for the program to trigger the alert system
digitalWrite(led4, HIGH);
sound = 500;
}
else {
digitalWrite(led4,LOW);
}
if (distance < 20) { //Conditions for the program to trigger the alert system
digitalWrite(led5, HIGH);
sound = 650;
}
else {
digitalWrite(led5,LOW);
}
if (distance < 10) { //Conditions for the program to trigger the alert system
digitalWrite(led6, HIGH);
sound = 800;
}
else {
digitalWrite(led6,LOW);
}
if (distance > 60 || distance <= 1){ //Conditions for the program to trigger the alert system
digitalWrite(led,HIGH);
digitalWrite(led3,HIGH);
digitalWrite(led5,HIGH);
delay(250);
digitalWrite (led,LOW);
digitalWrite(led3,LOW); //LED animation for showing no target
digitalWrite(led5,LOW);
delay(300);
digitalWrite(led2,HIGH);
digitalWrite(led4,HIGH);
digitalWrite(led6,HIGH);
Serial.println("\nSNAP :( Target is Out Of Range \n");
tone(buzzer,10500); //Sound alert for no target
}
else {
Serial.print("Target is now ");
Serial.print(distance);;
Serial.println(" cm away :)\n");
tone(buzzer, sound);
}
delay(333); //Halt the program for specified microseconds
}
The confusing thing is that when i run a normal code without any alert system it measures distance perfectly .See below code .It has no problem's and run's correctly without displaying any inaccuracy .
// defines pins numbers
const int trigPin = 7;
const int echoPin = 6;
// 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
Serial.begin(19200); // Starts the serial communication
}
void loop() {
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
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: ");
Serial.println(distance);
Serial.print("Duration :");
Serial.println(duration);
}
Please help me solving my mystery .Seem's like a programming problem ..I am not able to figure it out ...
(My project picture,Serial Monitor output is also attached )
Thanks in advance ...
EDIT 1 :Here is the Solution .
Replace Old extract of code.
.
.
.
.
.
Serial.println("\nSNAP :( Target is Out Of Range \n");
tone(buzzer,10500); //Sound alert for no target
.
.
.
.
.
New piece of code
.
.
.
.
.
Serial.println("\nSNAP :( Target is Out Of Range \n");
tone(buzzer,900);//Sound alert for no target
delay(100);
noTone(buzzer);
.
.
.
.
Seems like arduino wasn't able to power up the buzzer correctly which made the sensor go mad !
Hope this help's .
