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 NXP Semiconductors


  • The Creative Dancing Lights

  • Created: Oct 13, 2014

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Description

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Summary

Dancing Lights is a simple yet amusing project that entertains the user because of its attractive sequence of lightings. This can be constructed with few components such as NE555 timer,74HC4017BQ and assorted colors of LEDs. The 74HC4017 is a 5‑stage Johnson decade counter with 10 decoded outputs (Q0 to Q9), an output from the most significant flip‑flop (Q5‑9), two clock inputs (CP0 and CP1) and an overriding asynchronous master reset input (MR). In addition, the counter is advanced by either a LOW‑to‑HIGH transition at CP0 while CP1 is LOW or a HIGH‑to‑LOW transition at CP1 while CP0 is HIGH.


The circuit is based on NE555 (U2) & 74HC4017BQ (U1) where the NE555 precision timer is wired as an astable multivibrator to provide the clock pulses for the decade counter. For each clock pulse receiving at the clock input (pin14) of IC 74HC4017BQ, the outputs Q0 to Q9 becomes high one by one alternatively. The LEDs connected to these pins glow in the same fashion to give a dancing effect. The speed of the dancing LEDs depends on the frequency of the clock pulses generated by the NE555 timer.


This project is made for entertainment. It can be used as accessories in vehicles, christmas lights displays or as home disco lights. This project is commonly observed in bars and during christmas season. The device brings a lively ambience that entertains people at all ages which can be simply constructed and modified as desired.

3 Comments


PB Fortich

I can build this somehow ^^

Posted: Jan 18, 2015


prajna

what will happen if i do not put the 220 ohm resistor before the led......

Posted: Sep 05, 2015


NEIL MULA

Hi, as I check the datasheet of 74HC4017BQ, output current is around 25mA while the LEDs operates at 20mA. If you removed 220Ω resistor probably might have effect on the brightness but it will be minor.

Posted: Mar 30, 2016


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