Ultrasonic Sensor – HC-SR04

provides 2cm to 400cm of non-contact measurement

const int TRIG_PIN = 46;
const int ECHO_PIN = 47;
const unsigned int MAX_DIST =23200;//Anything over400cm(23200 us pulse)is"out of range"
void setup() {
  // The Trigger pin will tell the sensor to range find
  pinMode(TRIG_PIN, OUTPUT);
  digitalWrite(TRIG_PIN, LOW);
  // We'll use the serial monitor to view the sensor output
  Serial.begin(9600);
}
void loop() {
  unsigned long t1;
  unsigned long t2;
  unsigned long pulse_width;
  float cm;
  float inches;
  // Hold the trigger pin high for at least 10 us
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);  // Wait for pulse on echo pin
  while ( digitalRead(ECHO_PIN) == 0 );  // Measure how long the echo pin was held high (pulse width)
  // Note: the micros() counter will overflow after ~70 min
  t1 = micros();
  while ( digitalRead(ECHO_PIN) == 1);
  t2 = micros();
  pulse_width = t2 - t1;  // Calculate distance in centimeters and inches. The constants
  // are found in the datasheet, and calculated from the assumed speed 
  //of sound in air at sea level (~340 m/s).
  cm = pulse_width / 58.0;
  inches = pulse_width / 148.0ک  // Print out results
  if ( pulse_width > MAX_DIST ) {
    Serial.println("Out of range");
  } 
else {
    Serial.print(cm);
    Serial.print(" cm \t");
    Serial.print(inches);
    Serial.println(" in");
  }   // Wait at least 60ms before next measurement
  delay(60);
}

const int TRIG_PIN = 46;

const int ECHO_PIN = 47;

const unsigned int MAX_DIST =23200;//Anything over400cm(23200 us pulse)is"out of range"

void setup() {

// The Trigger pin will tell the sensor to range find

pinMode(TRIG_PIN, OUTPUT);

digitalWrite(TRIG_PIN, LOW);

// We'll use the serial monitor to view the sensor output

Serial.begin(9600);

}

void loop() {

unsigned long t1;

unsigned long t2;

unsigned long pulse_width;

float cm;

float inches;

// Hold the trigger pin high for at least 10 us

digitalWrite(TRIG_PIN, HIGH);

delayMicroseconds(10);

digitalWrite(TRIG_PIN, LOW); // Wait for pulse on echo pin

while ( digitalRead(ECHO_PIN) == 0 ); // Measure how long the echo pin was held high (pulse width)

// Note: the micros() counter will overflow after ~70 min

t1 = micros();

while ( digitalRead(ECHO_PIN) == 1);

t2 = micros();

pulse_width = t2 - t1; // Calculate distance in centimeters and inches. The constants

// are found in the datasheet, and calculated from the assumed speed

//of sound in air at sea level (~340 m/s).

cm = pulse_width / 58.0;

inches = pulse_width / 148.0ک // Print out results

if ( pulse_width > MAX_DIST ) {

Serial.println("Out of range");

}

else {

Serial.print(cm);

Serial.print(" cm \t");

Serial.print(inches);

Serial.println(" in");

} // Wait at least 60ms before next measurement

delay(60);

}

2.4inch TFT LCD

How to use 2.4inch TFT LCD with arduino MEGA 2560

//2.4 Inch TFT LCD Shield Touch Board Display
#include &lt;Adafruit_GFX.h&gt;    
#include &lt;SWTFT.h&gt;   //This is a Software TFT LCD driver for MEGA 2560 Pins
              //https://github.com/Smoke-And-Wires/TFT-Shield-Example-Code
#include &lt;TouchScreen.h&gt;  //https://github.com/adafruit/Touch-Screen-Library
#include &lt;SD.h&gt;      //This SD.H is from SD-master https://github.com/adafruit/SD/archive/master.zip  
//Touch Panel 2,4 " TFT LCD Schild Modul TF Reader Micro SD For Arduino UNO R3
#define TS_MINX 243
#define TS_MINY 250
#define TS_MAXX 910
#define TS_MAXY 957
#define YP A3  
#define XM A2  
#define YM 9   
#define XP 8 
#define LCD_CS A3
#define LCD_CD A2
#define LCD_WR A1
#define LCD_RD A0
#define LCD_RESET A4
#define  BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF
#define SD_CS 10 
SWTFT tft;
void setup()
 {
 Serial.begin(9600);
 Serial2.begin(9600);     //Connected to Raspberry pi
 Serial3.begin(9600);     //Connected to IR Tranciever
 pinMode(BEEP_PIN, OUTPUT);
 Serial.println("tft.reset");//pinMode(13, OUTPUT);
 tft.reset();
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);
uint16_t identifier = tft.readID();
if(identifier == 0x9325) Serial.println(F("Found ILI9325 LCD driver"));
else if(identifier == 0x9328) Serial.println(F("Found ILI9328 LCD driver"));
else if(identifier == 0x7575) 
Serial.println(F("Found HX8347G LCD driver"));
else if(identifier == 0x9341) Serial.println(F("Found ILI9341 LCD driver"));
else if(identifier == 0x8357) Serial.println(F("Found HX8357D LCD driver"));
else {
      Serial.print(F("Unknown LCD driver chip: "));
      return;
 }
  SPI.begin();                // Init SPI bus
  mfrc522.PCD_Init();         // Init MFRC522 card
  tft.begin(identifier);
  if (!SD.begin(10)) {
  	Serial.println(F("failed!"));
      	return;
}
Serial.println(F("OK!"));
bmpDraw("display.bmp", 0, 0);
}
void loop() 
{
}