LCD Shield

Components Used:

1x Arduino Uno R3

1x LCD Shield V2.0

 

LCD Shield.png

Program:

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

Author : Ankit Modi
 Date : 28-09-2017

This program will test the LCD panel and the buttons.When you push the button on the shield,
 the screen will show the corresponding one.
 
 Connection: Plug the LCD Keypad to the UNO(or other controllers)

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

#include <LiquidCrystal.h>

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

// 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

int read_LCD_buttons(){ // read the 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
 // We make this the 1st option for speed reasons since it will be the most likely result

if (adc_key_in > 1000) return btnNONE; 
/*
 // 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); // set the LCD cursor position 
 lcd.print("Push the buttons"); // print a simple message on the LCD
}
 
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:{ // push button "RIGHT" and show the word on the screen
 lcd.print("RIGHT ");
 break;
 }
 case btnLEFT:{
 lcd.print("LEFT "); // push button "LEFT" and show the word on the screen
 break;
 } 
 case btnUP:{
 lcd.print("UP "); // push button "UP" and show the word on the screen
 break;
 }
 case btnDOWN:{
 lcd.print("DOWN "); // push button "DOWN" and show the word on the screen
 break;
 }
 case btnSELECT:{
 lcd.print("SELECT"); // push button "SELECT" and show the word on the screen
 break;
 }
 case btnNONE:{
 lcd.print("NONE "); // No action will show "None" on the screen
 break;
 }
 }
}
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