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- //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;
- }
- }
- }
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