KeypadCallibration.ino

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

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

This program will test the LCD panel and the buttons on D1 Robot LCD Keypad
Michael Jonathan, February 2019

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

// 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;  

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

void setup()
{
 lcd.begin(16, 2);              // start the library
 lcd.setCursor(0, 0);
 lcd.print("Created By");
 lcd.setCursor(0,1);
 lcd.print("Michael Jonathan");
 delay(3000);
 lcd.clear();
 lcd.setCursor(0,0);
 lcd.print("Push the buttons"); // print a simple message
}
 
void loop()
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(analogRead(A0));
  delay(300); // delay for the display, you can change it

}

//to clear the LCD display, use the comment below
//lcd.clear();