Unterschiede

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--- elektronik:arduino [2012/04/07 07:13] – volkerp
+++ elektronik:arduino [2015/04/16 18:51] (aktuell) – volkerp
@@ Zeile 9: / Zeile 9: @@
-===== DFRobot LCD keypad Shield =====
+===== meine Uhr =====
-Und ein DFRobot LCD keypad Shield (Mai 2011, US $17,75 aus Hongkong)
 {{:elektronik:arduino-uhr.jpg?300|}}
-Unterlagen, Schaltplan, Beispielcode:
-http://www.dfrobot.com/wiki/index.php?title=Arduino_LCD_KeyPad_Shield_(SKU:_DFR0009)
-etwas in Deutsch:
-http://www.kriwanek.de/arduino/komponenten/156-lcd-shield.html
-^ Arduino Pin ^ LCD-Pin ^
-| Analog 0 | Taste (Up, Down, Left, Right, Select) |
-| Digital 4 | DB 4 |
-| Digital 5 | DB 5 |
-| Digital 6 | DB 6 |
-| Digital 7 | DB 7 |
-| Digital 8 | RS (Command or Data) |
-| Digital 9 | Enable |
-| Digital 10 | Hintergrundbeleuchtung |
-Neben einer normalen 2x16-LCD-Anzeige mit Hintergrundbeleuchtung gibt es 5 Tasten, die interessanterweise nicht einzeln auf Digitalports gehen, sondern nur über einen einzigen Analogport abgefragt werden: Die Tasten liefern über einen Widerstands-Spannungsteilerkette unterschiedliche Spannungswerte.
-Die LCD-Anzeige kann über die Standard-Arduino-Bibliothek **LiquidCrystal** angesteuert werden. Initilaisierung
-LiquidCrystal lcd(8,9,4,5,6,7);
-Die Tasten werden so abgefragt:
-<file>
-//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
- 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;
-     }
- }
-}
-</file>