Encoder Display rev_03

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    - Project: Encoder Display
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2025-07-15 22:52:12

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Capture the rotational angle in degrees from the */
    /* KY-040 rotary encoder and show the result on an */
    /* LCD screen through I2C communication, leveraging */
    /* the SimpleEncoder library. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <SimpleEncoder.h>    //http://github.com/EasyG0ing1/SimpleEncoder
#include <LCDIC2.h>           //https://github.com/offcircuit/LCDIC2

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t encoder_CLK_PIN = 2;
const uint8_t encoder_DT_PIN = 3;
const uint8_t encoder_SW_PIN = 4;

/***** DEFINITION OF I2C PINS *****/
// Note: On ESP32, the default I2C pins are typically GPIO 21 (SDA) and GPIO 22 (SCL),
// but here we define A4 and A5 for compatibility. Ensure these are used correctly.
const uint8_t LCD_SDA_PIN = A4;
const uint8_t LCD_SCL_PIN = A5;
const uint8_t LCD_I2C_ADDRESS = 0x27; // Common address for LCD1602 I2C

/***** LIBRARIES CLASS INSTANCES *****/
// Instantiate the LCD
LCDIC2 lcd(LCD_I2C_ADDRESS, 16, 2);

// Instantiate the encoder
SimpleEncoder encoder(encoder_CLK_PIN, encoder_DT_PIN, encoder_SW_PIN);

void setup(void)
{
    // Initialize serial communication for debugging (optional)
    Serial.begin(9600);

    // Initialize LCD
    if (lcd.begin()) {
        lcd.print("Angle:");
    }

    // Configure encoder pins
    pinMode(encoder_CLK_PIN, INPUT);
    pinMode(encoder_DT_PIN, INPUT);
    pinMode(encoder_SW_PIN, INPUT_PULLUP);
}

void loop(void)
{
    static long lastReportedAngle = 0;
    // Update the encoder state
    encoder.check();

    // Read the current angle in degrees
    float angle = encoder.ANGLE;

    // Optional: Only update display if angle changes significantly
    if (abs(angle - lastReportedAngle) >= 1) {
        lastReportedAngle = angle;

        // Clear the previous angle display
        lcd.setCursor(0, 1);
        lcd.print("                "); // Clear line
        lcd.setCursor(0, 1);
        lcd.print("Angle: ");
        lcd.print(angle);
        lcd.print(" deg");

        // Also print to serial for debugging
        Serial.print("Rotational Angle: ");
        Serial.print(angle);
        Serial.println(" degrees");
    }

    delay(100); // Small delay to debounce and reduce flickering
}

/* END CODE */