งานที่12

#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); }