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Programmable clock

Overview

For everyday use,

CH340C chip is used as the download circuit to provide power for simultaneous downloading. This can be omitted if external programming is possible.
A TP5400 power supply is used; this can also be omitted if the device is not portable or will be placed on the computer for extended periods.
An 18650 battery can be used for higher capacity.
The screen uses an LCD1602 to display the time and other functions, and the dimming can be adjusted to personal preference.
The clock uses a DS1302 chip, which is inexpensive and stable.
A common DHT11 module is used for temperature and humidity monitoring; this can be omitted if not needed. Note that different LCD1602 models may have different sizes
when using STC-ISP software for programming ; please check carefully. Version V0.9 is not compatible; please refer to V1.0 and later versions. Version V0.9 will automatically enter sleep mode due to low current consumption (IP5306), which is a useful lesson learned. The screen display orientation can be adjusted in the LCD1602 driver code, thus changing the charging direction.

Design Files

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Update:2026-03-25 22:55:57

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