Encoder Display rev_04

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

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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_KY_040_CLK_PIN_D2 = 2;
const uint8_t encoder_KY_040_DT_PIN_D3 = 3;
const uint8_t encoder_KY_040_SW_PIN_D4 = 4;

/***** DEFINITION OF I2C PINS *****/
const uint8_t angleDisplay_LCD1602I2C_I2C_PIN_SDA_A4 = A4;
const uint8_t angleDisplay_LCD1602I2C_I2C_PIN_SCL_A5 = A5;
const uint8_t angleDisplay_LCD1602I2C_I2C_SLAVE_ADDRESS = 39;

/****** DECLARATION OF LIBRARY OBJECT INSTANCES *****/
// Initialize SimpleEncoder with CLK, DT, SW pins
SimpleEncoder encoder(encoder_KY_040_CLK_PIN_D2, encoder_KY_040_DT_PIN_D3, encoder_KY_040_SW_PIN_D4);

// Initialize LCD with I2C address, 16 columns, 2 rows
LCDIC2 lcd(angleDisplay_LCD1602I2C_I2C_SLAVE_ADDRESS, 16, 2);

/****** VARIABLE DECLARATION *****/
float angleDegrees = 0;

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

    // Setup encoders pins
    pinMode(encoder_KY_040_CLK_PIN_D2, INPUT);
    pinMode(encoder_KY_040_DT_PIN_D3, INPUT);
    pinMode(encoder_KY_040_SW_PIN_D4, INPUT_PULLUP);

    // Initialize LCD
    if (lcd.begin()) {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Rotary Encoder");
        lcd.setCursor(0, 1);
        lcd.print("Angle: 0 deg");
    }
}

void loop(void)
{
    // Read encoder for clockwise rotation
    if (encoder.CLOCKWISE)
    {
        angleDegrees += 1;
        encoder.CLOCKWISE = false; // Reset the flag
    }
    // Read encoder for counterclockwise rotation
    if (encoder.COUNTERCLOCKWISE)
    {
        angleDegrees -= 1;
        encoder.COUNTERCLOCKWISE = false; // Reset the flag
    }
    // Optional: Clamp angle between 0 and 360
    if (angleDegrees >= 360)
    {
        angleDegrees -= 360;
    }
    else if (angleDegrees < 0)
    {
        angleDegrees += 360;
    }

    // Display the angle on the LCD
    lcd.setCursor(0, 1);
    lcd.print("Angle: ");
    lcd.print(angleDegrees);
    lcd.print(" deg  ");

    // Optional: Print to serial for debugging
    Serial.print("Current angle: ");
    Serial.println(angleDegrees);

    // Small delay to improve readability and debounce
    delay(100);
}