sequential led bar graph circuit


Posted on Feb 5, 2014

The article describes a simple method of making an incremental LED bar graph by using the IC 4017, which is rather equipped with specifications not suiting the present functions. Let`s learn how we can mod the IC for the operations. Here we study an easy method of making an array of LEDs chase  to develop into a sequential LED bar graph. The LED


sequential led bar graph circuit
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s start from one of the 10 pin outs of the IC and go on switching one after the other until all the LEDs are lit forming an incrementing bar graph. The circuit uses the ordinary IC 4017 for implementing this interesting LED light sequence. The main component of this sequential LED driver circuit is the popular Johnson`s Decade Counter IC 4017. As we all know, the normal functioning of the IC involves sequential shifting of its outputs 1 to 11, in response to a clock signal applied at its pin #14. The outputs become high in sequence such that the previous output becomes low immediately as the high  position leaps  through the assigned pi-outs. If LEDs are connected to the outputs, the above sequence would produce an effect of an illuminated dot  jumping from start to finish and repeating the sequence. Though the effect looks interesting, fails to bewitch the folks simply because the illuminations produced are very low. This is because, only one LED or lamp glows at any instant while sequencing, not enough to make the system very eye-catching. However the sequencing factor of the IC cannot be ignored as it`s one complex function that cannot be achieved a single IC and the chip must be credited for this attribute. So, what can we do to improve the above feature such that the engaged lights become more attractive and the sequencing feature is also exploited at the same time One idea would be to stop the former LEDs in the...




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