JOS Code explanation

JOS Code Explanation

In this walkthrough, we'll dive into a Java sketch that leverages Adafruit's excellent TFT and touchscreen libraries. I'll highlight the customizable elements and functionalities, from varying the sketch's update intervals to changing button names.

Libraries and Initial Setup

First, we use specific libraries from Adafruit, namely Adafruit_TFTLCD.h and TouchScreen.h. These libraries provide robust tools for interacting with TFT displays and touchscreens.

Color Definitions and Customization

The code starts with some customized color definitions. Utilizing an RGB to hex converter makes defining new colors straightforward. I'll cover this in a separate video.

Battery Check

One principal variable is batteryCheck, which dictates how often the sketch checks battery voltage and updates the battery icon.

int batteryCheck = 1000; // Example value

Display and UI Setup

The display setup includes drawing the splash screen and status bar. You can customize the status bar's color easily.

tft.fillRect(0, 0, tft.width(), 20, JJ_COLOR); // Example status bar color customization

Button Customizations

Each button’s functionality and labeling can be customized. Button names are set via specific string variables.

char button1Text[] = "Hi Jeremy"; // Example button text customization

Page Redraws and Settings

We handle screen redraws efficiently to maintain performance. Extra code is involved when leaving the settings page to make the transition smoother.

if (currentPage == SETTINGS_PAGE) (
    loadSettings();
) else (
    // Standard page redraw
)

EEPROM and Data Management

Settings and configurations are saved to EEPROM, ensuring persistent data storage even after power cycles.

EEPROM.write(EEPROM_ADDRESS, storedSetting);

Signal Indicators

The sketch includes a signal indicator mechanism that can switch between inactive and active states, useful for real-time feedback.

void drawSignalIndicator(bool active) (
    if (active) {
        tft.drawBitmap(30, 5, activeSignalBitmap, WHITE);
    ) else (
        tft.drawBitmap(30, 5, inactiveSignalBitmap, WHITE);
    )
}

Miscellaneous Features

Other features include customizable sleep timers, backlight controls, and an adaptable message box that can display or clear messages based on user input.

void handleMessageBoxInteraction() (
    if (messageBoxActive) {
        tft.fillRect(MSG_BOX_X, MSG_BOX_Y, MSG_BOX_WIDTH, MSG_BOX_HEIGHT, BG_COLOR);
        messageBoxActive = false;
    ) else (
        tft.drawText(MSG_BOX_X, MSG_BOX_Y, "New Message", FONT, MSG_COLOR);
        messageBoxActive = true;
    )
}

Conclusion

This Java sketch provides a highly flexible platform for building interactive touchscreen applications. Customizable elements are clearly marked, and the framework efficiently manages resources and performance.

For detailed variables and function explanations, refer to the inline comments and documentation within the code. If you have additional questions, feel free to reach out.

Keywords

• Adafruit Libraries
• TFT Display
• Touchscreen
• Java Sketch
• Battery Check
• EEPROM
• Signal Indicator
• Button Customization

FAQ

Q: How do I change the update interval for battery checks?
A: You can change the update interval by modifying the batteryCheck variable. For example, int batteryCheck = 1000; sets the interval to 1000 milliseconds.

Q: Can I customize the colors used in the sketch?
A: Yes, you can easily customize the colors by redefining the RGB/hex values in the color definitions section of the code.

Q: How can I change the text displayed on buttons?
A: Button text can be changed by modifying the string variables associated with each button. For example, char button1Text[] = "Hi Jeremy";.

Q: What is the function of the EEPROM in this sketch?
A: EEPROM is used to store settings and configurations to preserve them even after power cycles.

Q: How do I add a new button?
A: You can add new buttons by defining new areas in the code and specifying their corresponding actions and labels.

Q: What does the signal indicator do, and how can I use it?
A: The signal indicator shows whether a specific signal is active or inactive. You can trigger this in your code by calling drawSignalIndicator(true) for active and drawSignalIndicator(false) for inactive.

Q: Can I change how often the screen redraws?
A: Yes, screen redraw intervals can be adjusted by revising the relevant timings and conditions in the redraw sections of the code.