HT1621 Arduino Library

This is a custom Arduino library for interfacing with the HT1621 LCD controller, tailored for complex segmented displays. The library supports rendering numeric and textual information, along with specialized markers and symbols, on custom boards like the one shown in the provided image.

Features

• Full support for the HT1621 LCD driver
• Print numeric and text values
• Built-in handling for markers and symbols (e.g., VOLUME, TREBLE, FM, etc.)
• Customizable backlight control
• Battery level indicators
• Decimal point and colon rendering
• Display modes (clear, update, and toggle markers)
• Precision handling for numeric and floating-point values

Supported Markers

The library includes predefined markers for specific board symbols:

• Audio Settings: CLASSIC, ROCK, POP, FLAT, JAZZ
• Inputs: AUX, DVD, CD, OPT, COA, RADIO
• Playback Controls: PLAY, PAUSE, FORWARD, PREVIOUS
• Audio Channels: 2.1CH, 5.1CH
• Other Symbols: USB, CLOCK, TREBLE, MUTE, DELAY, MS

For the full list, see the symbol definitions in the source code.

Installation

1. Clone this repository or download the ZIP file.
2. Place the folder in your Arduino libraries directory.
3. Restart your Arduino IDE.

Pinout Information

This project includes the following components and their respective connections to the microcontroller:

Buttons

Matrix keypad as in the figure.

Infrared (IR) Receiver

• IR Signal: Connected to IR

HT1621 LCD Controller

• WR (Write): Connected to P4.1
• Data: Connected to P4.2
• CS (Chip Select): Connected to P4.3

Power

• 5V: Supplies power to the board.
• GND: Ground connection.

Important Note:
The board's printing inverts the power pins. Double-check connections using electrolitic capacitors as ground true, before powering up the system to avoid damage.

Usage

Basic Setup

#include "HT1621.h"

HT1621 lcd;

void setup() {
    lcd.begin(10, 11, 12); // Connect CS, WR, DATA pins
    lcd.clear();
    lcd.backlight();
}

void loop() {
    lcd.print(123.45, 2); // Display a floating-point number with two decimals
    lcd.setMarker(VOLUME); // Highlight the VOLUME symbol
    lcd.display(); // Refresh the display
    delay(1000);
}

Custom Printing

• Use lcd.print() to display numbers or text.
• Use lcd.setMarker(MARKER) to highlight specific board markers.
• For advanced usage, see the example sketches in the repository.

Backlight Control

lcd.backlight();    // Turn on backlight
lcd.noBacklight();  // Turn off backlight

Clearing the Display

lcd.clear();       // Clear the display content
lcd.clear_buffer(); // Clear the internal buffer without refreshing

License

This library is distributed under the MIT License. See LICENSE for more information.

Acknowledgments

• Based on the segment-lcd-with-ht1621 library by anxzhu.
• Extended and partially rewritten by Valerio Nappi.
• Further customized to support unique display designs.

Contributions

Feel free to contribute to this project by submitting issues or pull requests. Whether it's enhancing functionality or providing new examples, all contributions are welcome!