超音波實驗教室

第一個程式

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#define trig 12

#define echo 13

LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a chars and 2 line

//display

void setup()

{

lcd.init(); // initialize the lcd

lcd.backlight();

lcd.print("HC-SR04 Sensor Test");

pinMode (trig, OUTPUT);

pinMode (echo, INPUT);

}

void loop()

{

float duration, distance;

digitalWrite(trig, HIGH);

delayMicroseconds(1000);

digitalWrite(trig, LOW);

duration = pulseIn (echo, HIGH);

distance = (duration/2)/29;

lcd.setCursor(0, 1);

lcd.print("Dist: ");

lcd.print(", CM: ");

lcd.print(distance);

delay(1000);

}

第二個程式

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#define trig 12

#define echo 13

//const int inter_time = 1000;

const int speaker=2;

LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a chars and 2 line display

void setup()

{

lcd.init(); // initialize the lcd

lcd.backlight();

lcd.print("HC-SR04 Sensor=>");

pinMode (trig, OUTPUT);

pinMode (echo, INPUT);

}

void loop()

{

float duration, distance;

digitalWrite(trig, HIGH);

delayMicroseconds(1000);

digitalWrite(trig, LOW);

duration = pulseIn (echo, HIGH);

distance = (duration/2)/29;

lcd.setCursor(0, 1);

lcd.print("Dist: ");

lcd.print(", CM: ");

lcd.print(distance);

int dis=distance;

switch (dis) {

case 2:

tone(speaker,5000);

delay(50);

tone(speaker,2000);

delay(50);

noTone(speaker);

break;

case 3:

tone(speaker,4000);

delay(50);

tone(speaker,2000);

delay(50);

noTone(speaker);

break;

case 4:

tone(speaker,2000);

delay(50);

tone(speaker,1000);

delay(50);

noTone(speaker);

break;

case 5:

tone(speaker,1000);

delay(50);

tone(speaker,500);

delay(50);

noTone(speaker);

break;

}

delay(1000);

}