งานปฏิบัติที่ 12 งานโปรแกรมเชื่อมต่อโมดูลวัดระยะทางด้วยอัลตร้าโชนิก HC-SR04

wiring diagram

รูปที่ 1





โค้ดที่12.1 (Code Arduino)

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

int triggerPin = 13;

int echoPin = 12;

long duration,distCM,temp_distCM=0;

void setup() 

{

  lcd.begin();

  lcd.setCursor(0,0);

  lcd.print("Dist =      cm");

  pinMode(triggerPin,OUTPUT);

  pinMode(echoPin,INPUT);

}

void loop() 

{

  digitalWrite(triggerPin,LOW);

  delayMicroseconds(2);

  digitalWrite(triggerPin,HIGH);

  delayMicroseconds(10);

  digitalWrite(triggerPin,LOW);

  duration = pulseIn(echoPin,HIGH);

  distCM = duration/58;

  if (temp_distCM != distCM)

  {

    lcd.setCursor(7,0);

    lcd.print("    ");

  }

  lcd.setCursor(7,0);

  lcd.print(distCM);

  temp_distCM = distCM;

  delay(300);

}

โค้ดที่12.2 (Code Arduino)

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

int triggerPin = 13;

int echoPin = 12;

long duration,distCM;

void setup() 

{

  lcd.begin();

  pinMode(triggerPin,OUTPUT);

  pinMode(echoPin,INPUT);

}

void loop() 

{

  digitalWrite(triggerPin,LOW);

  delayMicroseconds(2);

  digitalWrite(triggerPin,HIGH);

  delayMicroseconds(10);

  digitalWrite(triggerPin,LOW);

  duration = pulseIn(echoPin,HIGH);

  distCM = duration/58;

  int x = constrain(distCM,4,19);

  lcd.clear();

  lcd.home();

  for (int i=4;i<=x;i++)

      lcd.print("*");

  delay(150);

}

รูปที่ 2

โค้ดที่12.3 (Code Arduino)

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
int triggerPin = 13;
int echoPin = 12;
int buzzerpin = 11;
long duration,distCM;
void setup() 
{
  lcd.begin();
  pinMode(buzzerpin,OUTPUT);
  pinMode(triggerPin,OUTPUT);
  pinMode(echoPin,INPUT);
  digitalWrite(buzzerpin,HIGH);
}
void loop() 
{
  digitalWrite(triggerPin,LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin,HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin,LOW);
  duration = pulseIn(echoPin,HIGH);
  distCM = duration/58;
  lcd.home();
    if (distCM > 400)
  {    
    lcd.clear();
    lcd.print("**!!!Alarm!!!**");
    tone(buzzerpin,700,500);
    delay(500);
    digitalWrite(buzzerpin,HIGH);
    delay(70); 
    lcd.setCursor(0,1);
    lcd.print(distCM);   
  }
  else
  {
    lcd.print("<-------------->");
    lcd.setCursor(0,1);
    lcd.print(distCM);
  }
}

โค้ดที่12.4 (Code Arduino)

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
int triggerPin = 13;
int echoPin = 12;
int buzzerpin = 11;
long duration,distCM;
void setup() 
{
  lcd.begin();
  pinMode(buzzerpin,OUTPUT);
  pinMode(triggerPin,OUTPUT);
  pinMode(echoPin,INPUT);
  digitalWrite(buzzerpin,HIGH);
}
void loop() 
{
  digitalWrite(triggerPin,LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin,HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin,LOW);
  duration = pulseIn(echoPin,HIGH);
  distCM = duration/58;
  lcd.home();
  if ((distCM>=4)&&(distCM<=30))
  {    
    lcd.clear();
    lcd.print("#####Alarm#####");
    int dl = distCM*20;
    tone(buzzerpin,600,dl);
    delay(dl);
    digitalWrite(buzzerpin,HIGH);
    delay(70);    
  }
  else
  {
    lcd.print("  Dist > 30 cm  ");
  }

}