In daily life, I think that in addition to clocks, set clocks are also very useful, such as cooking and steaming steamed buns. I want to make a low-cost, easy-to-use timing clock. It can be powered by 5VUSB charging wire. Use it for power supply, take it off when not in use. In addition to the basic functions, I also thought of using other functions of the chip as extensions.
The scalable functions are:
1. Using the RTC function, the program can be extended to a clock.
2. This design has a serial port that can communicate with WIFI, so it can be extended to WIFI control timing.
This time we only implement the most basic function---the timer. The maximum length can be set to 1 hour and 60 seconds.
Blockdiagram
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