[vc_row][vc_column][vc_column_text][/vc_column_text][vc_tour][vc_tab title=”Part list” tab_id=”1394617120-1-0″][vc_column_text]1  x  [bigcommerce link=”/cityduino-arduino-uno-compatible-device/” target=”_blank”] arduino UNO [/bigcommerce]

1  x  [bigcommerce link=”/ultrasonic-sensor-breakout-srf04/” target=”_blank”]Ultrasonic Module HCSR04[/bigcommerce]

1  x  [bigcommerce link=”/2-8-touch-lcd-shield-for-arduino-pcduino/” target=”_blank”]Serial 16×2 LCD shield R04[/bigcommerce]

6  x DuPont line

1  x 5v 2A[bigcommerce link=”/ac-100-240v-0-3a-dc-5v-2a-us-plug-usb-power-supply-adapter/” target=”_blank”] power[/bigcommerce][/vc_column_text][/vc_tab][vc_tab title=”Wiring Diagram” tab_id=”1394617120-2-89″][vc_column_text]HCSR04  Vcc – > arduino  Vin

HCSR04  GND – >arduino  GND

HCSR04  Trig  – >  arduino  D2

HCSR04  Echo – > arduino  D3

Serial 16×2 LCD shield  +5v – >  arduino  +5v

Serial 16×2 LCD shield   GND – > arduino  GND

Serial 16×2 LCD shield  Rx – >arduino   Tx

After the wiring is finished,  plug in 5v 2A power to the power supply port for arduino.   Then connect the computer with USB.[/vc_column_text][/vc_tab][vc_tab title=”Test code” tab_id=”1394617359621-2-6″][vc_column_text]

#include <stdio.h>

const int LCDdelay=10;
const int TriPin = 2;
const int EchoPin = 3;
float cm;
void lcdPosition(int row, int col) {
  Serial.write(0xFE); //command flag
  Serial.write((col + row*64 + 128)); //position
  delay(LCDdelay);
}
void clearLCD(){
  Serial.write(0xFE); //command flag
  Serial.write(0x01); //clear command.
  delay(LCDdelay);
}
void backlightOn() { //turns on the backlight
  Serial.write(0x7C); //command flag for backlight stuff
  Serial.write(157); //light level.
  delay(LCDdelay);
}
void backlightOff(){ //turns off the backlight
  Serial.write(0x7C); //command flag for backlight stuff
  Serial.write(128); //light level for off.
  delay(LCDdelay);
}
void serCommand(){ //a general function to call the command flag for issuing all other commands
  Serial.write(0xFE);
}

void setup()
{
  Serial.begin(9600);
  pinMode (TriPin, OUTPUT);
  pinMode (EchoPin, INPUT);
}

void loop()
{
  digitalWrite (TriPin, LOW);
  delayMicroseconds (2);
  digitalWrite (TriPin, HIGH); 
  delayMicroseconds (10);
  digitalWrite (TriPin, LOW);
  cm = pulseIn (EchoPin, HIGH, 100000) / 58.0;
  cm = (int (cm * 100.0)) / 100.0; 
  backlightOn ();
  clearLCD ();
  lcdPosition (0, 0);
  Serial.print ("Arduino: ");
  Serial.print (cm);
  Serial.print (" cm - LinkSprite");
  delay (1000);
}

[/vc_column_text][/vc_tab][vc_tab title=”Test result” tab_id=”1394617360718-3-4″][vc_column_text]The picture is the same as the beginning, 16 × 2 screen will display “Arduino: xxx (measured out the distance) cm – LinkSprite”

Use a piece of paper or other obstructions to block before the emission head, the 16*2 screen will show the distance between the obstruction and emission head.[/vc_column_text][/vc_tab][/vc_tour][/vc_column][/vc_row]