Published September 16, 2025 © CC BY

Project #30 - UNIHIKER - RTC - Mk18

BeginnerFull instructions provided1 hour32

Things used in this project

Hardware components

DFRobot UNIHIKER K10

DFRobot Gravity: I2C SD2405 RTC Module

DFRobot Lithium Ion Battery - 1000mAh

SparkFun Switch

DFRobot USB 3.1 Cable A to C

Software apps and online services

Arduino IDE

Story

Project #30 - UNIHIKER - RTC - Mk18

#DonLucElectronics #DonLuc #RTC #UNIHIKER #Display #IoT #Project #DFRobot #Fritzing #Programming #Electronics #Microcontrollers #Consultant

Gravity I2C SD2405 RTC module

We're glad to introduce a new member in Gravity family: Gravity I2C SD2405 RTC module. This is an extremely accurate I2C Real Time Clock (RTC) with crystal compensation, inner chargeable battery. The SD2405AL is available in industrial temperature ranges.

The SD2405AL is dual power supply system. When the primary power supply goes down to an assigned value or resumes from low power, the system can switch between the primary power supply and battery automatically. Even there is no external power, it can still work for 5~8 years, 1uA ultra-low power consumption (inner battery.

The SD2405AL can generates various periodic interrupt clock pulses lasting for long period, and three alarm interrupts can be made by year, month, date, days of the week, hours, and minutes, seconds. It also provides a selectable 32.768 KHz~1Hz clock output for an external MCU. The product incorporates a time trimming circuit that adjusts the clock with higher precision by adjusting any errors in crystal oscillator frequencies based on signals from the CPU. A 12-bytes general SRAM is implemented in the SD2405AL.

DL2508Mk01

1 x UNIHIKER K10

1 x Gravity I2C SD2405 RTC module

1 x Lithium Ion Battery - 1000mAh

1 x Switch

1 x USB 3.1 Cable A to C

DL2508Mk01p

DL2508Mk01p.mp

People can contact us:http://www.donluc.com/?page_id=1927

Consultant, R&D, Electronics, IoT, Teacher and Instructor

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Don Luc

Code

DL2508Mk01p

/****** Don Luc Electronics © ******
Software Version Information
Project #30 - UNIHIKER - RTC - Mk18
DL2508Mk01p.mp
DL2508Mk01
1 x UNIHIKER K10
1 x Gravity I2C SD2405 RTC module
1 x Lithium Ion Battery - 1000mAh
1 x Switch
1 x USB 3.1 Cable A to C
*/

// Include the Library Code
// Unihiker K10
#include "unihiker_k10.h"
// Gravity I2C SD2405 RTC module
DFRobot_DS0469 ds0469;
// Create an object
UNIHIKER_K10  k10;
// Screen
uint8_t screen_dir=2;

// Main program start
void setup() {
	
  // Begin
  k10.begin();
  // Init Screen
  k10.initScreen(screen_dir);
  // Canver
  k10.creatCanvas();
  // Gravity I2C SD2405 RTC module
  ds0469.begin();
  // Image
  k10.canvas->canvasDrawBitmap(0,0,240,320,image_data1);

}
// Loop
void loop() {
	
  // Gravity I2C SD2405 RTC module
  k10.canvas->canvasText("Real Time Clock", 6, 0xFF0000);
  // RTC
  // Year
  k10.canvas->canvasText(ds0469.getTime(ds0469.YEAR), 7, 0x0000FF);
  // Month
  k10.canvas->canvasText(ds0469.getTime(ds0469.MONTH), 8, 0x0000FF);
  // Date
  k10.canvas->canvasText(ds0469.getTime(ds0469.DATE), 9, 0x0000FF);
  // Hour
  k10.canvas->canvasText(ds0469.getTime(ds0469.HOUR), 10, 0x0000FF);
  // Minute
  k10.canvas->canvasText(ds0469.getTime(ds0469.MINUTE), 11, 0x0000FF);
  // Seconds
  k10.canvas->canvasText(ds0469.getTime(ds0469.SECONDS), 12, 0x0000FF);
  // Update Canvas
  k10.canvas->updateCanvas();

}

Credits

Luc Paquin

44 projects • 4 followers

Teacher, Instructor, E-Mentor, R&D and Consulting -Programming Language -Microcontrollers -IoT -Robotics -Machine Learning -AI -Sensors

Project #30 - UNIHIKER - RTC - Mk18

Things used in this project

Hardware components

Software apps and online services

Story

Project #30 - UNIHIKER - RTC - Mk18

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DFRobot

Gravity I2C SD2405 RTC module

DL2508Mk01

DL2508Mk01p

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Luc Paquin – Curriculum Vitae - 2025

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Project #30 - UNIHIKER - RTC - Mk18

Project #30 - UNIHIKER - RTC - Mk18

Things used in this project

Hardware components

Software apps and online services

Story

Project #30 - UNIHIKER - RTC - Mk18

Web

Facebook

YouTube

DFRobot

Gravity I2C SD2405 RTC module

DL2508Mk01

DL2508Mk01p

Consultant, R&D, Electronics, IoT, Teacher and Instructor

Follow Us

Luc Paquin – Curriculum Vitae - 2025

Don Luc

Schematics

Fritzing

Code

DL2508Mk01p

Credits

Luc Paquin

Comments

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