LCD Help Coding

Projects Programming
21

maybe..

/*
  https://forum.arduino.cc/t/lcd-help-coding/1277759

*/


#include <LiquidCrystal.h>

// Initialize the LCD library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const int photoresistorPin = A0;
const int buttonPin = 7;
bool lightDetected = false; // Flag to track if light is detected

byte buttonPressed = 1; // Flag to track if last button state

String currentText = "text1";
String buttonText = "text2";
//starts with the current text
String displayText = currentText;
//flag to know which text..
byte textFlag = 0;

byte stateSys = 0;
unsigned long lastMove = 0;
unsigned long intervalMove = 2000;

unsigned long lastPress = 0;
unsigned long debounceDelay = 50;

void setup() {
  // Set up the LCD's number of columns and rows
  lcd.begin(16, 2);
  pinMode(buttonPin, INPUT_PULLUP);
  // Don't print anything initially
}
void loop() {

  unsigned long now = millis();
  int sensorValue = analogRead(photoresistorPin);

  if ( now - lastPress >= debounceDelay) {
    byte buttonState = digitalRead(buttonPin);
    if (buttonState != buttonPressed) {
      //button change, start debouncing
      lastPress = now;
      buttonPressed = buttonState; // remember
      if (buttonState == LOW) {
        if (textFlag < 1) {
          displayText = buttonText;
          textFlag = 1;
        } else {
          displayText = currentText;
          textFlag = 0;
        }
        if (stateSys > 1) stateSys = 1;
      }
    }
  }

  // Adjust this threshold based on your environment
  if (sensorValue > 500) {
    lightDetected = true;
    //only if less than 1, could be scrolling state 2
    if (stateSys < 1) {
      stateSys = 1;
    }
  } else {
    lightDetected = false;
    stateSys = 0;
  }


  switch (stateSys) {
    case 0: lcd.clear(); //no light just Clear the LCD
      break;
    case 1: lcd.clear(); // Clear the LCD
      // Print the message at the beginning of the first row
      lcd.setCursor(0, 0);
      lcd.print(displayText);
      //setup 2 second delay
      lastMove = now;
      intervalMove = 2000;//delay for static text
      stateSys = 2;
      break; //light first detect
    case 2: if (now - lastMove >= intervalMove) {
        lastMove = now;
        intervalMove = 1000;// scrolling delay..
        lcd.scrollDisplayLeft(); // Scroll the display to the left
      }
      break;
  }
}

~q

22

that works perfectly! Thank you so much.

23

you're welcome..
have fun.. ~q