Digital Clock Kit AT89C2051 DC5V-12V with 3V Backup Battery

A Digital Clock Kit to Build and Set Up Yourself This digital clock kit is built around the AT89C2051 microcontroller chip and runs on an input voltage of DC5V to 12V. It is designed for electronics enthusiasts and amateurs who enjoy building and assembling their own gadgets, offering a practical project to work through from start to finish. Clear Display and Reliable Timekeeping The clock uses three red common two-bit LED digital tubes to show the time clearly. A 3V backup battery is included, so the clock continues to run and keep its time even during a power outage, giving you reliable timekeeping without interruption. Simple Button Calibration Setting the time is straightforward. Press and hold the calibration button for two seconds to enter the time adjustment mode, then use the quick keys to set the correct hours and minutes. Press and hold the button again for two seconds to exit the mode. Adjustable Brightness and Technical Details The brightness of the LED display can be adjusted by changing the resistance value at R4R10, allowing you to set a comfortable level for your environment. This kit is suitable for both beginners and more experienced users who want a hands-on electronics project.