Hardware circuit diagram of square wave signal generator-EEWORLD

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The MCS51 series single-chip microcomputer At89S51 is used as the main controller, and the peripheral circuit devices include digital tube driver, independent keyboard, square wave pulse output and light-emitting diode display. The digital tube driver uses two four-connected common cathode digital tubes for display. Due to the limited driving capacity of the single-chip microcomputer, 74HC244 is used as the driver of the digital tube. A 100-ohm resistor is connected in series on the 7-segment code output line of 74HC244 to limit the current. The independent key uses a pull-up circuit to connect to the power supply. When no key is pressed, it outputs a high level. The light-emitting diode is connected in series with a 500-ohm resistor and then connected to the power supply. When the input is low, the light-emitting diode is turned on and emits light.

Figure Schematic diagram of the hardware circuit of the square wave signal generator

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