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/* | |
Mini Project ตลับเมตรไร้สาย แสดงบนจอ LCD พัฒนาด้วย Arduino พร้อม Code โปรแกรม ตัวอย่าง | |
จากบทความ : https://www.ab.in.th/b/5 | |
ภาพการต่อวงจร : https://dx.lnwfile.com/_/dx/_raw/3l/3d/y5.png | |
Download Library : https://download.เอบี.ไทย/d.php?file=Arduino-LiquidCrystal-I2C-library-master.zip | |
*/ | |
#include <LiquidCrystal_I2C2.h> | |
LiquidCrystal_I2C lcd(0x27, 16, 2); //Module IIC/I2C Interface บางรุ่นอาจจะใช้ 0x3f | |
#define trigPin D5 | |
#define echoPin D6 | |
void setup() { | |
Serial.begin (9600); | |
pinMode(trigPin, OUTPUT); | |
pinMode(echoPin, INPUT); | |
lcd.begin(); | |
lcd.backlight(); | |
lcd.home(); | |
lcd.print("Distance "); | |
} | |
void loop() { | |
long duration, distance; | |
digitalWrite(trigPin, LOW); // Added this line | |
delayMicroseconds(2); // Added this line | |
digitalWrite(trigPin, HIGH); | |
delayMicroseconds(10); // Added this line | |
digitalWrite(trigPin, LOW); | |
duration = pulseIn(echoPin, HIGH); | |
distance = (duration/2) / 29.1; | |
lcd.setCursor(0, 1); | |
if (distance >= 200 || distance <= 0){ | |
Serial.println("Out of range"); | |
lcd.print("Out of range"); | |
} else { | |
Serial.print(distance); | |
Serial.println(" cm"); | |
lcd.print(distance); | |
lcd.print(" CM "); | |
} | |
delay(500); | |
} | |
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