[Arduino] Ultrasonic, Keypad and Temperature and Humidity Sensor

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※ Ultrasonic Sensor (external library)

Circuit

Add zip library to include it in the source code.

HC-SR04_Library.zip

=> This NewPing library converts ping time to distance and print result.

Source Code

//www.elegoo.com
//2016.06.13

#include <NewPing.h>

#define TRIGGER_PIN  12  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     11  // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

void setup() {
  Serial.begin(9600); // Open serial monitor at 115200 baud to see ping results.
}

void loop() {
  delay(500);  // Wait 500ms between pings (about 2 pings/sec). 29ms should be the shortest delay between pings.
  unsigned int uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).
  Serial.print("Ping: ");
  Serial.print(uS / US_ROUNDTRIP_CM); // Convert ping time to distance and print result (0 = outside set distance range, no ping echo)
  Serial.println("cm");
}

==> Result

※ Membrane switch (Keypad)

Circuit

Download and add KeyPad Library

http://playground.arduino.cc/Code/Keypad

Source Code

//www.elegoo.com
//2016.06.13

/* @file CustomKeypad.pde
|| @version 1.0
|| @author Alexander Brevig
|| @contact alexanderbrevig@gmail.com
||
|| @description
|| | Demonstrates changing the keypad size and key values.
|| #
*/
#include <Keypad.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

void setup(){
  Serial.begin(9600);
}
 
void loop(){
  char customKey = customKeypad.getKey();
 
  if (customKey){
    Serial.println(customKey);
  }
}

==> Result : If you press any button then the value of the button will be display

※ Temperature and Humidity Sensor

Circuit

add SimpleDHT library

SimpleDHT.zip

Source Code

//www.elegoo.com
//2016.06.13

#include <SimpleDHT.h>

// for DHT11,
//      VCC: 5V or 3V
//      GND: GND
//      DATA: 2
int pinDHT11 = 2;
SimpleDHT11 dht11;

void setup() {
  Serial.begin(9600);
}

void loop() {
  // start working...
  Serial.println("=================================");
  Serial.println("Sample DHT11...");
 
  // read with raw sample data.
  byte temperature = 0;
  byte humidity = 0;
  byte data[40] = {0};
  if (dht11.read(pinDHT11, &temperature, &humidity, data)) {
    Serial.print("Read DHT11 failed");
    return;
  }
 
  Serial.print("Sample RAW Bits: ");
  for (int i = 0; i < 40; i++) {
    Serial.print((int)data[i]);
    if (i > 0 && ((i + 1) % 4) == 0) {
      Serial.print(' ');
    }
  }
  Serial.println("");
 
  Serial.print("Sample OK: ");
  Serial.print((int)temperature); Serial.print(" *C, ");
  Serial.print((int)humidity); Serial.println(" %");
 
  // DHT11 sampling rate is 1HZ.
  delay(1000);
}

==> Result