Arduino – CLCD with I2C – Back Light + Button
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#include <Wire.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); // or 0x3F int buttonBack=4; unsigned long cnt=0; boolean flagBacklight=true; void setup() { pinMode(buttonBack, INPUT); lcd.init(); delay(1000); lcd.backlight(); lcd.setCursor(0,0); lcd.print("Run Time"); } void loop() { lcd.setCursor(0,1); lcd.print(millis()); if (digitalRead(buttonBack) && cnt==0) { flagBacklight=!flagBacklight; cnt=millis(); if (flagBacklight) { lcd.backlight(); } else { lcd.noBacklight(); } } else if (millis() > cnt+300) { cnt=0; } } |