HC-SR04 RGB LED Controller with Sensor

Projects Programming
1

Hello everyone, nice to meet you.
I am a student
I need to understand why this code doesn't work.
I want to control the LED light with the HC-SR04 sensor.
Could I talk to someone about this problem please?

//libreria ultrasonic
#include <Ultrasonic.h>
Ultrasonic ultrasonic(4,2);//declarar trigger y echo
//Sensor HC-SR04
int trigger = 4;
int echo = 2;

int distancia;
long tiempo;




//Led RGB
int blue=9;
int green=10;
int red=11;





void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
//Led
pinMode(red,OUTPUT);
pinMode(blue,OUTPUT);
pinMode(green,OUTPUT);

//Sensor HC-SR04
pinMode(trigger,OUTPUT);
pinMode(echo,INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  distancia = ultrasonic.read();
  Serial.print("Distancia en cm:");
  Serial.println(distancia);
  delay(1000);


digitalWrite(trigger,LOW);
delay(1000);
digitalWrite(trigger, HIGH);
delay(200);
digitalWrite(trigger,LOW);



//definir dos variable para capturar tiempo y distancia


if (distancia < 15){
  analogWrite(blue, 0);
  analogWrite(red, 125);
  delay(2000);
  analogWrite(red, 0);
  analogWrite(green, 0);
  
}

if (distancia > 15 ){
  analogWrite(blue, 0);
  analogWrite(red, 0);
  delay(1000);
  analogWrite(green, 100);
  delay(1000);
  
}

if (distancia > 40){
  analogWrite(blue, 0);
  analogWrite(red, 0);
  analogWrite(green, 200);
  delay(1000);
  
}

switch (distancia){
  case 0:
  analogWrite(blue, 0);
  analogWrite(red, 125);
  delay(2000);
  analogWrite(red, 0);
  analogWrite(green, 0);
  break;

  case 1:
  analogWrite(blue, 0);
  analogWrite(red, 0);
  delay(1000);
  analogWrite(green, 100);
  delay(1000);
  break;

  case 2:
  analogWrite(blue, 0);
  analogWrite(red, 0);
  analogWrite(green, 200);
  delay(1000);
  break;



}



}
2

You started a topic in the Uncategorised category of the forum when its description explicitly tells you not to

Your topic has been moved to a relevant category. Please be careful in future when deciding where to start new topics

3

So, what it does or does not to be "not working".
What you get on serial monitor?
Also what board you have and how is your wiring?

1 Like
4

Hello, I have checked the ports and connections and they are correct.
I have changed my code
But I cannot get the condition for the green LED to turn on
Thank you for your information

//HC - SR04 con librerĂ­a NrePing
#include <NewPing.h>
NewPing newPing(4,2,60);
//Sensor HC-SR04
int trigger = 4;
int echo = 2;

int maxdistanciasensor= 60;
int distancia;
long tiempo;

//Led RGB
int blue=9;
int green=10;
int red=11;

void setup() {
  Serial.begin(9600);
  //Sensor HC-SR04
pinMode(trigger,OUTPUT);
pinMode(echo,INPUT);

//Led
pinMode(red,OUTPUT);
pinMode(blue,OUTPUT);
pinMode(green,OUTPUT);
  


}

void loop() {
  delay(50);
  distancia = newPing.ping_cm();
  Serial.print("Distancia en cm:");
  Serial.println(distancia);
  delay(1000);

 



  if (distancia < 15 ){
    analogWrite(red, 125);
  delay(2000);
  analogWrite(green, 0);
  delay(0);
  analogWrite(blue, 0);
  delay(0);
  }

  else if (distancia > 15 ){
    analogWrite(red, 0);
  delay(0);
  analogWrite(green, 0);
  delay(0);
  analogWrite(blue, 120);
  delay(2000);
  }

  else if (distancia > 40 ) {
  analogWrite(red, 0);
  delay(0);
  analogWrite(green, 180);
  delay(2000);
  analogWrite(blue, 0);
  delay(0);
  }

  

  


}
5

There are a lot of unecessary delays in your code and the conditions need to be adjusted. Try the version below:

//HC - SR04 con librerĂ­a NrePing
#include <NewPing.h>
NewPing newPing(4,2,60);
//Sensor HC-SR04
int trigger = 4;
int echo = 2;

int maxdistanciasensor= 60;
int distancia;
long tiempo;

//Led RGB
int blue=9;
int green=10;
int red=11;

void setup() {
  Serial.begin(9600);
  //Sensor HC-SR04
pinMode(trigger,OUTPUT);
pinMode(echo,INPUT);

//Led
pinMode(red,OUTPUT);
pinMode(blue,OUTPUT);
pinMode(green,OUTPUT);
}

void loop() {
  delay(50);
  distancia = newPing.ping_cm();
  Serial.print("Distancia en cm:");
  Serial.println(distancia);

  if (distancia <= 15 ){
  analogWrite(red, 125);
  analogWrite(green, 0);
  analogWrite(blue, 0);
  }

  else if (distancia > 15 && distancia <=40){
  analogWrite(red, 0);
  analogWrite(green, 0);
  analogWrite(blue, 120);
  }

  else if (distancia > 40 ) {
  analogWrite(red, 0);
  analogWrite(green, 180);
  analogWrite(blue, 0);
  }
}

PS1: as you're configuring the maximun distance in 60cm, everything thereafter will be considered "zero" and arise a red light.

PS2: you don't need this block:

int trigger = 4;
int echo = 2;
int maxdistanciasensor= 60;

if you´re calling this line before it:

1 Like
6

40 is greater than 15, so when the HC-SR04 return is "41" you will have GREEN or BLUE (because the compiler might put green after blue). Change...

  else if (distancia > 15) {

to

  else if (distancia >= 15 && distancia <= 40) {
1 Like
7

Hello Brazilino,
Your opinion has helped me understand the problem a little more, I hope you have also been able to learn something about it.
thank you so much, :hugs:

8

Now I understand it better.
Thank you very much, nice to meet you.

9

Very good that your project is working now. : )

When you begin a topic, describing how the sketch works (or does not work) is very important in solving the problem. "doesn't work" must be more descriptive.

1 Like
10

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