This project is mine [this is my first attempt, so there will be a lot of problems] and is currently being improved.

• The digital tube I use is 41mm X 29mm;
• The digital tube driver uses four 74HC595s in order to save a very complicated driver circuit.
• There are four touch buttons that need to be plugged into the computer USB for normal use or plugged into a power supply below 1A.
• The main control MCU uses STC8G1K08. This chip does not have touch button function.
• The electronic clock chip uses RX8025T-UB
• The temperature sensor uses DS18B20
• A photoresistor is also used as a brightness adjustment sensor for the digital tube.
• There is also a buzzer that is intended to be used as an alarm clock, but it cannot be implemented in the program, so this can be fully implemented in the next version.

Implementation of functions and some problems

I got the digital tubes a long time ago, and I had a lot of them, so I wanted to use them as an electronic clock. The size of my digital tube is a bit special and difficult to buy. The length of the four rows together is more than 10mm, so I don’t recommend it. The production cost is a bit high. My wiring for the third digital tube was reversed, so the third one has to be rotated 180 degrees. The display code of the digital tube is reversed. This problem can only be corrected in the program. Also, the four capacitors on the display panel of the digital tube are a bit large. Later, I need to change the touch buttons to smaller ones. At first, I thought that the entire series of STC8G microcontrollers has it. After reading the data sheet in detail later, I found that it is only available on one chip, so it is a bit difficult to deal with in the later stage. There are two problems with the electronic clock. 1. The problem on the chip is not a problem during the design. It is not until the soldering is completed to test the board. It was found that the voltage detection line of the standby battery of the clock chip cannot be connected, which will cause the electricity on the battery to pass through the MCU to the power line to supply power to various parts. 2 means that the FOUT port interrupt signal line of the clock chip should be connected to the microcontroller pin.