Difference between revisions of "Arduino: LCD keypad shield"

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[[File:FKUA4JDITKJE7UI.LARGE.jpg|center|400px|thumb]]
 
[[File:FKUA4JDITKJE7UI.LARGE.jpg|center|400px|thumb]]
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 +
 +
==Test Program==
 +
 +
//Sample using LiquidCrystal library
 +
#include <LiquidCrystal.h>
 +
 +
/*******************************************************
 +
 +
This program will test the LCD panel and the buttons
 +
Mark Bramwell, July 2010
 +
 +
********************************************************/
 +
 +
// select the pins used on the LCD panel
 +
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
 +
 +
// define some values used by the panel and buttons
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int lcd_key    = 0;
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int adc_key_in  = 0;
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#define btnRIGHT  0
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#define btnUP    1
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#define btnDOWN  2
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#define btnLEFT  3
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#define btnSELECT 4
 +
#define btnNONE  5
 +
 +
// read the buttons
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int read_LCD_buttons()
 +
{
 +
  adc_key_in = analogRead(0);      // read the value from the sensor
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  // my buttons when read are centered at these valies: 0, 144, 329, 504, 741
 +
  // we add approx 50 to those values and check to see if we are close
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  if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result
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  // For V1.1 us this threshold
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  if (adc_key_in < 50)  return btnRIGHT; 
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  if (adc_key_in < 250)  return btnUP;
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  if (adc_key_in < 450)  return btnDOWN;
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  if (adc_key_in < 650)  return btnLEFT;
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  if (adc_key_in < 850)  return btnSELECT; 
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 +
  // For V1.0 comment the other threshold and use the one below:
 +
/*
 +
  if (adc_key_in < 50)  return btnRIGHT; 
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  if (adc_key_in < 195)  return btnUP;
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  if (adc_key_in < 380)  return btnDOWN;
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  if (adc_key_in < 555)  return btnLEFT;
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  if (adc_key_in < 790)  return btnSELECT; 
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*/
 +
 +
 +
  return btnNONE;  // when all others fail, return this...
 +
}
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 +
void setup()
 +
{
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  lcd.begin(16, 2);              // start the library
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  lcd.setCursor(0,0);
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  lcd.print("Push the buttons"); // print a simple message
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}
 +
 
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void loop()
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{
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  lcd.setCursor(9,1);            // move cursor to second line "1" and 9 spaces over
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  lcd.print(millis()/1000);      // display seconds elapsed since power-up
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 +
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  lcd.setCursor(0,1);            // move to the begining of the second line
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  lcd_key = read_LCD_buttons();  // read the buttons
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 +
  switch (lcd_key)              // depending on which button was pushed, we perform an action
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  {
 +
    case btnRIGHT:
 +
      {
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      lcd.print("RIGHT ");
 +
      break;
 +
      }
 +
    case btnLEFT:
 +
      {
 +
      lcd.print("LEFT  ");
 +
      break;
 +
      }
 +
    case btnUP:
 +
      {
 +
      lcd.print("UP    ");
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      break;
 +
      }
 +
    case btnDOWN:
 +
      {
 +
      lcd.print("DOWN  ");
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      break;
 +
      }
 +
    case btnSELECT:
 +
      {
 +
      lcd.print("SELECT");
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      break;
 +
      }
 +
      case btnNONE:
 +
      {
 +
      lcd.print("NONE  ");
 +
      break;
 +
      }
 +
  }
 +
}
 +
 +
  
  

Revision as of 17:30, 3 February 2018

LCD Keybrd1-700x700.jpg
FKUA4JDITKJE7UI.LARGE.jpg


Test Program

//Sample using LiquidCrystal library
#include <LiquidCrystal.h>

/*******************************************************

This program will test the LCD panel and the buttons
Mark Bramwell, July 2010

********************************************************/

// select the pins used on the LCD panel
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

// define some values used by the panel and buttons
int lcd_key     = 0;
int adc_key_in  = 0;
#define btnRIGHT  0
#define btnUP     1
#define btnDOWN   2
#define btnLEFT   3
#define btnSELECT 4
#define btnNONE   5

// read the buttons
int read_LCD_buttons()
{
 adc_key_in = analogRead(0);      // read the value from the sensor 
 // my buttons when read are centered at these valies: 0, 144, 329, 504, 741
 // we add approx 50 to those values and check to see if we are close
 if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result
 // For V1.1 us this threshold
 if (adc_key_in < 50)   return btnRIGHT;  
 if (adc_key_in < 250)  return btnUP; 
 if (adc_key_in < 450)  return btnDOWN; 
 if (adc_key_in < 650)  return btnLEFT; 
 if (adc_key_in < 850)  return btnSELECT;   

 // For V1.0 comment the other threshold and use the one below:
/*
 if (adc_key_in < 50)   return btnRIGHT;  
 if (adc_key_in < 195)  return btnUP; 
 if (adc_key_in < 380)  return btnDOWN; 
 if (adc_key_in < 555)  return btnLEFT; 
 if (adc_key_in < 790)  return btnSELECT;   
*/


 return btnNONE;  // when all others fail, return this...
}

void setup()
{
 lcd.begin(16, 2);              // start the library
 lcd.setCursor(0,0);
 lcd.print("Push the buttons"); // print a simple message
}
 
void loop()
{
 lcd.setCursor(9,1);            // move cursor to second line "1" and 9 spaces over
 lcd.print(millis()/1000);      // display seconds elapsed since power-up 
 

 lcd.setCursor(0,1);            // move to the begining of the second line
 lcd_key = read_LCD_buttons();  // read the buttons 

 switch (lcd_key)               // depending on which button was pushed, we perform an action
 {
   case btnRIGHT:
     {
     lcd.print("RIGHT ");
     break;
     }
   case btnLEFT:
     {
     lcd.print("LEFT   ");
     break;
     }
   case btnUP:
     {
     lcd.print("UP    ");
     break;
     }
   case btnDOWN:
     {
     lcd.print("DOWN  ");
     break;
     }
   case btnSELECT:
     {
     lcd.print("SELECT");
     break;
     }
     case btnNONE:
     {
     lcd.print("NONE  ");
     break;
     }
 }
}



Referensi

Pranala Menarik

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