Guitar water lamp

The NE555 is powered through the type_c interface to realize the charging and discharging process of the capacitor in the NE555, thus changing the digital signal output by the NE555. The cycle of charging and discharging puts the output digital signal in a cyclic state, that is, outputting a square signal from the output port (OUT) of the NE555 wave signal. This square wave signal is output to the clock interface (CLOCK) of CD4017, causing the Q0~Q9 pins to output high level one by one. Q0~Q9 are connected to ten small LED lights in sequence. The high level output by each pin causes the corresponding small LED light to light up, realizing a reciprocating cycle of lighting up ten small LED lights, that is, to achieve the effect of a running water lamp. By twisting the potentiometer, the frequency of the digital signal (square wave) output by the NE555 is changed, that is, the frequency of the ten pins Q0~Q9 in the CD4017 outputting high levels in sequence is changed, thereby changing the frequency of the LED water lamp lighting up one by one. Achieve the effect of changing the lighting speed of the LED running water lamp.

Problems encountered and solutions: It took a long time to weld type_c for the first time, and it failed in the end. When I soldered for the second time, I slowly found a trick, which is to solder a little bit first, and then gently touch the solder with the tip of the soldering iron. The solder connecting the patches can be easily separated. It is very easy to use in my personal test.

Gains: In addition to the improvement of welding skills, the biggest gain is that I roughly understand how to use NE555 and CD4017 to implement the principle of running water lamps without code, and I have benefited a lot.