# include
液晶显示器(7,6,5,4,3,2);const int trigPin = 11;const int echoPin = 10;Const int led = 13;void setup() {pinMode(trigPin, OUTPUT);pinMode (echoPin、输入);pinMode(领导、输出);液晶显示器。开始(16日2);液晶显示器。print ("Ultrasonic "); lcd.setCursor(0, 1); lcd.print ("Range Meter"); delay (5000); } long duration, r; float distance; void loop() { lcd.clear(); lcd.print("Distance in cm"); digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); long r = 3.4 * duration / 2; float distance = r / 100.00; lcd.setCursor(0, 1); lcd.print(distance); delay (300); if(distance<10) { digitalWrite(led,HIGH); } else { digitalWrite(led,LOW); } delay(300); }