Controlling LED In Keypad App By Android App

Introduction

In this article, I am going to explain about controlling the LED in Keypad app by an Android app. It will be run in  a real time process for the home application.

 

Software Requirement

1. Arduino Uno
2. Leds
3. Bread Board
4. Hook Up Wires 

Connection from Arduino Board to LEDs

Leds	Arduino Board
Led1	11
Led1	12
Led1	13
Led1	14

 

Programming

#define CUSTOM_SETTINGS
#define INCLUDE_KEYPAD_SHIELD
/* Include 1Sheeld library. */
#include <OneSheeld.h>
int A, B, C, D; //vaiables with names of buttons in keypad
/* A name for the LED on pin 8. */
int yellow = 8;
/* A name for the LED on pin 9. */
int green = 9;
/* A name for the LED on pin 10. */
int white = 10;
/* A name for the LED on pin 11. */
int red = 11;

void setup()
{
  /* Start communication. */
  OneSheeld.begin();
  /* Set LEDs as output. */
  pinMode(yellow, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(white, OUTPUT);
}

void loop()
{
  Keypad.setOnButtonChange(&lightLed);
}
void lightLed (byte rowNumber , byte coloumnNumber)
{
    /* If keypad's button A is pressed. */
  if(Keypad.isRowPressed(0) && Keypad.isColumnPressed(3))
  {
    A = 1; // press A
    B = 0;
    C = 0;
    D = 0;
  }

  else if(Keypad.isRowPressed(1) && Keypad.isColumnPressed(3))
  {
    A = 0;
    B = 1;// press B
    C = 0;
    D = 0;
  }

   else if(Keypad.isRowPressed(2) && Keypad.isColumnPressed(3))
  {
    A = 0;
    B = 0;
    C = 1;  // press c
    D = 0;
  }

   else if(Keypad.isRowPressed(3) && Keypad.isColumnPressed(3))
  {
    A = 0;
    B = 0;
    C = 0;
    D = 1; // press D
  }
  else
  {
    /* Turn off all of LEDs. */
    digitalWrite(yellow,LOW);
    digitalWrite(green,LOW);
    digitalWrite(white,LOW);
    digitalWrite(red,LOW);
  }
  if(A) //press button A
    digitalWrite(yellow, HIGH);
  if(B) //press button B
    digitalWrite(green, HIGH);
  if(C) //press button C
    digitalWrite(white, HIGH);
  if(D) //press button D
    digitalWrite(red, HIGH);
}

Explanation

According to the connection, upload program to the board and download the keypad app in the Playstore, install, and see the result. In the LEDs, when you press the 1 key, it is switched ON. Similarly, the other LEDs also get turned ON and OFF by the keypad app, without bluetooth.

 

Output