超音波HCSR04_顯示距離於LCD_NodeMCU_ESP8266

超音波HCSR04_顯示距離於LCD_NodeMCU_ESP8266

/* Sketch was generated by motoblockly 
 Website: http://www.motoblockly.com 
 Author: www.motoduino.com 
 Date: Wed Jan 09 2019 19:12:47 GMT+0800
 */ 
 //HC-SR04接線方式{GND ==> GND  VCC==>5V  Ting==>D7(13)  Echo==>D8(15)}
 //LCD接線方式{GND ==> GND  VCC==>5V  SDA==>D2(04)  SCL==>D1(05)}
#include <Wire.h>
#include <esp_LiquidCrystal_I2C.h>

esp_LiquidCrystal_I2C mylcd(0x27, 16, 2);
long  distance;
float ultrasonic_distance_13_15() {
  digitalWrite(13, LOW);
  digitalWrite(15, LOW);
  delayMicroseconds(5);
  digitalWrite(13, HIGH);
  delayMicroseconds(10);
  digitalWrite(13, LOW);
  unsigned long sonic_duration = pulseIn(15, HIGH);
  float distance_cm = (sonic_duration / 2.0) / 29.1;
  return distance_cm;
}

void setup()
{
  mylcd.init();
  mylcd.backlight();

  pinMode( 13 , OUTPUT);
  pinMode( 15 , INPUT);
    distance = 0;

}


void loop()
{
    distance = ultrasonic_distance_13_15( );
    mylcd.clear();
    mylcd.setCursor(0,0);
    mylcd.print(String("Distance:") + String(distance) + String("cm"));
    delay(5000);

}