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• #1271 lajbi30 csendes tag dave0825 #1262

  Új Válasz 2015-07-20 11:01:22 #1271

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  lajbi30

  csendes tag

  válasz dave0825 #1262 üzenetére

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

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

  This program will test the LCD panel and the buttons of
  the DFRobot LCD Keypad Shield for Arduino
  Product code : RB-Dfr-07
  http://www.robotshop.com/dfrobot-lcd-keypad-shield-arduino-1.html

  Note cct error identified by Arduino forum discussion at:
  http://arduino.cc/forum/index.php/topic,96747.0.html
  which advises insertion of a Germanium 1n34a or a Schotky 1N5819
  diode between pin 10 and the base of Q1 (K to pin 10).

  sample code originally by Mark Bramwell, July 2010
  modifications by Dion Weston, March 2012

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

  // 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 backLight = 10; // LCD Panel Backlight LED connected to digital pin 10
  int lightLevel = 255; // Initialise light full on
  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 [Mark Bramwell's] 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
  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 LCD library
  lcd.setCursor(0,0); // move cursor to beginning of line "0"
  lcd.print("Backlight adjust"); // print a simple message

  }

  void loop()
  {
  analogWrite(backLight, lightLevel);
  lcd.setCursor(13,1); // move to position 13 on the second line
  lcd.print(lightLevel);

  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("LED On ");
  lightLevel = 255;
  break;
  }
  case btnLEFT:
  {
  lcd.print("LED Off ");
  lightLevel = 1;
  break;
  }
  case btnUP:
  {
  lcd.print("LED Fade Up ");
  if (lightLevel < 255) lightLevel += 1;
  break;
  }
  case btnDOWN:
  {
  lcd.print("LED Fade Down ");
  if (lightLevel > 1) lightLevel -= 1;
  break;
  }
  case btnSELECT:
  {
  lcd.print("Select ");
  break;
  }
  case btnNONE:
  {
  lcd.print(" ");
  break;
  }
  }

  }

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