A loop want to wait until a condition become true

[kohilan]

i have 2 pushbuttons and one ultrasonic sensor. when i press button 1 then led 1 want to glow and ultrasonic sensor want to wait until detect something in 15cm range. if ultrasonic sensor detect something the relays want to ON. in my code when i press button and at the same time ultrasonic sensor detect something relays are ON. please help me to solve this problem.

here is my code..

const int relay1 = 10;
const int relay2 = 11;
const int trig = 7;
const int echo = 6;
int btn1 = 8;
int btn2 = 9;
int btlight1 = 2;
int btlight2 = 3;
boolean bt1g = true;
boolean bt2g = true;
const int distance = 15; //centrimeters
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

float duration_us , distance_cm;


void setup() {
  Serial.begin(9600);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(btn1, INPUT_PULLUP);
  pinMode(btn2, INPUT_PULLUP);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(btlight1, OUTPUT);
  pinMode(btlight2, OUTPUT);

  lcd.init();
  lcd.backlight();

}

void loop() {

  digitalWrite(btlight1, HIGH);
  digitalWrite(btlight2, HIGH);
  delay(100);
  digitalWrite(btlight1, LOW);
  digitalWrite(btlight2, LOW);
  delay(100);

  digitalWrite(relay1, HIGH);
  digitalWrite(relay2, HIGH);





  //// BTN1 ////

  //if btn1 is on//


  digitalWrite(btlight1, HIGH);
  digitalWrite(btlight2, LOW);

  if ( digitalRead(btn1) == HIGH ) {


    // generate 10s pulse to trig pin //
    digitalWrite(trig, HIGH);
    delayMicroseconds(10);
    digitalWrite(trig, LOW);

    // measure duaration of pulse from echo pin//
    duration_us = pulseIn(echo, HIGH);

    // calculate the distance //
    distance_cm = 0.017 * duration_us;

    if ( distance_cm < distance ) {
      digitalWrite(relay1, LOW);
      digitalWrite(relay2, LOW);
      Serial.print("btn1:");
      Serial.println(1);
      delay(5000);
      bt1g = false;
    }
  }

  //if btn1 is off//


  digitalWrite(btlight1, LOW);

  if ( digitalRead(btn1) == LOW ) {


    digitalWrite(relay1, HIGH);
    digitalWrite(relay2, HIGH);
    Serial.print("btn1:");
    Serial.println(0);
    bt1g = true;
  }


  ////BTN2////

  //if btn2 is on//


  digitalWrite(btlight2, HIGH);
  digitalWrite(btlight1, LOW);

  if ( digitalRead(btn2) == HIGH ) {



    // generate 10s pulse to trig pin //
    digitalWrite(trig, HIGH);
    delayMicroseconds(10);
    digitalWrite(trig, LOW);

    // measure duaration of pulse from echo pin//
    duration_us = pulseIn(echo, HIGH);

    // calculate the distance //
    distance_cm = 0.017 * duration_us;

    if ( distance_cm < distance ) {
      digitalWrite(relay1, LOW);
      digitalWrite(relay2, LOW);
      Serial.print("btn2:");
      Serial.println(1);
      bt1g = false;
    }
  }

  //if btn2 is off//


  digitalWrite(btlight2, LOW);

  if ( digitalRead(btn2) == LOW ) {


    digitalWrite(relay1, HIGH);
    digitalWrite(relay2, HIGH);
    Serial.print("btn2:");
    Serial.println(0);
    bt2g = true;
  }
}

[UKHeliBob]

Welcome to the forum

@kohilan

here is my code..

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

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[StefanL38]

Hi Kohilan,
you should re-edit your first post. Below your post there is a pencil-icon

Click on that pencil-icon to activate edit-mode
There is a method to insert your complete sketch with a few mouse-clicks and keypresses

So as a first step simply delete all the code in your first posting

Then change to your Arduino-IDE and do this:

Then just paste the clipboard-content into the posting. By pressing Ctrl-V.
All formatting details are added automatically.

and you are done

best regards Stefan

[Paul_KD7HB]

@kohilan

//if btn1 is off//

I see your comment, but I do not see any code to detect if the switch is off. Perhaps there is something missing.

[kohilan]

[UKHeliBob]

Please do not post pictures of code