This schematic diagram uses STC89S52 single-chip microcomputer to control 8 LED lights, 8 of which are connected to the P1 port of the single-chip microcomputer, and the positive pole is connected to the power supply through 1KΩ. The crystal oscillator and the reset terminal are also shown in the schematic to ensure stable operation of the controller.
The water light is actually a minimum application system of a single-chip microcomputer with eight light-emitting diodes, that is, a single-chip microcomputer composed of a circuit such as a light-emitting diode, a crystal oscillator, a reset, a power supply, and the necessary software. As can be seen from the schematic diagram, if the LED1 connected to the P1.0 port is to be lit, then the level of the P1.0 port can be changed to a low level; on the contrary, if it is to be connected to the P1.0. When the LED1 of the port is turned off, it is necessary to change the level of the P1.0 port to a high level; similarly, the other 7 LEDs connected to the P1.1 to P1.7 ports are lit and extinguished in the same manner as the LED1. Therefore, in order to realize the function of the water light, we only need to turn on and off the LEDs LED1~LED8 in sequence, and the 8 LED lights will be light and dark. Here we should also note that due to the visual persistence effect of the human eye and the short time that the MCU executes each instruction, we should delay the control diode for a period of time, otherwise we will not see the "flowing water". The effect is.
The following figure shows the schematic diagram of the main control chip and the flow lamp module. The running water light module is connected to the P1 port of the single-chip microcomputer. It can be known from the schematic diagram that the Led Light can be illuminated by giving a low level at the P1 port. On the contrary, if the LED light is off, it is necessary to change the level of the P1 port to a high level. To realize the function of the water light, we only need to turn on and off the LED1~LED8 in sequence. According to the analogy, the 8 LEDs will become light and dark.
The implementation of 8 LED flow light programs is expressed in Chinese: P1.0 low, delay, P1.0 high, P1.1 low, delay, P1.1 high, P1.2 low, delay, P1.2 high , P1.3 low, delay, P1.3 high, P1.4 low, delay, P1.4 high, P1.5 low, delay, P1.5 high, P1.6 low, delay, P1. 6 high, P1.7 low, delay, P1.7 high, return to start, program end.
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