The multi-function digital clock is mainly composed of a display module, a clock module, a crystal oscillator and a reset circuit, a keyboard input and a temperature module. Figure 3-1 shows the schematic diagram of the system components of the five main parts.
When the system works, the electric signal input by the click button is input into the single-chip microcomputer through the input module. However, since the input signal is complicated and may be input at the same time, the priority of the signal needs to be paid attention to when designing the system. In terms of system composition, due to the block design method, this not only reduces the programming difficulty, makes the program easy to understand, but also can easily add various functions. The program can be divided into an alarm program, a time display program, a date display program, a time adjustment program, an alarm adjustment program, a timing adjustment program, an alarm sound program, and the like. The key to using this method is the compatibility and cooperation of each module. If the modules do not match, unexpected errors will occur.
The display module is a key part of the multi-function digital clock system. The alarm program, time display program, date display program, and adjustment program all need to be displayed on the LED LCD screen. It is necessary to select the appropriate solution according to the speed of the LED response speed. Control strategy and consider priority issues in the output
MCU multi-function digital clock design circuit (1)This design uses AT89S52 single-chip microcomputer as the controller, and the time calendar display uses LCD digital tube. The temperature and alarm can be displayed on the LCD. Figure 4-1 shows the overall circuit schematic of the system:
The whole system consists of display module, clock module, crystal and reset circuit, keyboard input and temperature module.
MCU multi-function digital clock design circuit (2)The alarm function allows you to set multiple alarms. The duration of the alarm is one minute. The alarm can be turned off manually by pressing the button. The alarm circuit module is as shown:
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