Changshu Polytechnic Water Lamp

This circuit has three parts, which are composed of delayed light off, constant light, and left and right running water lights.

1. The delay time of the delayed light-off
lamp is determined by the capacitor C1. In the actual circuit, pin 2 of the NE555 is given a low level by the human body, but in the simulation, it is replaced by the switch grounding. When a low level is input to pin 2, a high level is given by pin 3 to light up the LCD. When C1 is set to 7, it is called discharge reversal. When a low level is given by pin 3, the LCD goes out.
2. The left and right running water lamp
in this circuit uses the NE555 to generate a waveform signal as shown in Figure 1. The generated waveform signal is input to the clock input end of the counter, and digital signals are output through QA, QB, and QC. QD uses a NOT gate to control the left and right running water of the running water lamp. The digital signal transmitted by the compiler timer controls the flow of water lamps and water through high and low levels.