Hi there …
recently I purchase an Arduino LCD16*2 Shield for my UNO!
I upload the codes to my UNO but nothing shown on the LCD!
I tried the LCD test code, but nothing happened again!
I attached the LCD display picture while working, I pushed the buttons but there is no change on it!
I tested this code and library, any Idea? what should I do to run it?
#include <LiquidCrystal.h>
#include <LCDKeypad.h>
//contrast step
#define DELTA 10
LCDKeypad lcd;
//initial backlight
unsigned char bckl=150;
void setup(){
pinMode(10, OUTPUT);
analogWrite(10, bckl);
lcd.begin(16,2);
lcd.clear();
lcd.print(" Aadjust");
lcd.setCursor(0,1);
lcd.print(" Backlight");
delay(1000);
}
void loop(){
int btn;
lcd.clear();
lcd.print("Up and down keys");
lcd.setCursor(0,1);
lcd.print("Backlight:");
lcd.print(bckl);
//infinite loop of setting backlight
while(1)
{
//wait for button
lcd.blink();
while ((btn=lcd.button())==KEYPAD_NONE)
{
}
delay(50);
lcd.noBlink();
//wait for button release
while(lcd.button()!=KEYPAD_NONE)
{
}
//adjust the backlight
if (btn==KEYPAD_UP)
{
if ((0xFF-DELTA)>=bckl)
bckl +=DELTA;
else bckl = 0xFF;
}
else if (btn==KEYPAD_DOWN)
{
if (DELTA<=bckl)
bckl -= DELTA;
else bckl = 0;
}
lcd.setCursor(0,1);
//clear second LCD line
lcd.print(" ");
lcd.setCursor(0,1);
lcd.print("Backlight:");
lcd.print(bckl);
//set new backlight
analogWrite(10, bckl);
}
}
