Improved version-0.8 inch LED clock

Original design: https://oshwhub.com/micespring/0-8-inch-led-clock
Based on this: SD3078 was replaced by SD2068 because it was too expensive (30 yuan +), and the circuit layout was redesigned.

Haven't done any testing yet.

PCB_COPY is the PCB design of the original project, for reference only. Please select NEW when making a board

The software part is being written, and the program for reading clock chip data needs to be modified.

----------2022-5-24---------------

The software is written

After testing, everything except the buzzer can be used. It is guessed that the buzzer has too high a load on the LDO because the operating current is too high, and the MCU voltage is too low and cannot work properly.

Since the buzzer will affect normal operation, it is recommended not to weld. The code suggests changing the buzzer pin from A6 to A4 (empty pin)

The code changes are mainly changed from SD3077 to SD2068, that is, I2C writing and reading part of the content are changed.

Preview: The buzzer is still very noisy in practical applications, so I plan to replace it with an LED (marquee) or other design. Plus the bracket (90°, second PCB, soldered). Wait, then.

------------------2022-6-1---------------------

Project to remove the buzzer and change the LED: https://oshwhub.com/luoqi/0-8-cun-shi-zhong_copy

This is a branch, and the final result is not perfect. Copying is not recommended.

【Key points】：

The reason why the buzzer of this design cannot be used was found. The original author did not set the correct IO mode. After changing PP (open drain output) to OD (push pull), the transistor worked normally.

Another: Added display "LOVE" mode, a little secret for science men. Set the object's birthday: the month corresponds to the hour, and the day corresponds to the minute. Distance: The birthday on May 24th will display "LOVE" at 5:24 every day, but it is still recommended to use the 24-hour clock and let it display at 17:24, otherwise it will be really invisible in the early morning. You only need to modify the define of main.c, which is very easy.

The instructions written by the original author are also included. Except for the different boards, the content is the same.

Finally, this post is finished!