Arduino – CLCD with I2C – Back Light + CDS
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#include <Wire.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27,16,2); // or 0x3F int CDS=A0; unsigned long cnt=0; boolean flagBacklight=true; void setup() { lcd.init(); delay(1000); lcd.backlight(); lcd.setCursor(0,0); lcd.print("Run Time"); Serial.begin(9600); } void loop() { lcd.setCursor(0,1); lcd.print(millis()); if (analogRead(CDS) > 800 && flagBacklight==true) { flagBacklight=false; } else if (analogRead(CDS) < 600 && flagBacklight==false) { flagBacklight=true; } Serial.println(analogRead(CDS)); if (flagBacklight) { lcd.backlight(); } else { lcd.noBacklight(); } } |