10 LED sequencer using 4017 counter

[seanyiya]

Where is a good place to buy components for this??
http://ourworld.compuserve.com/homepages/Bill_Bowden/4017-2.gif

I went to Fry's Electronic, but they are so limited....
I've searched Digi-Key.com but came out with too many different styles....

What is the 4017B??
Which 555 timer I would need??
I'm beginning to learn this sequencing..... help....

Someone said they replaces the transistor with SCR... is there reason for that??

[justDIY]

Where is a good place to buy components for this??

www.glitchbuster.com

Great assortment of ICs, microcontrollers and support components - everything to get you started.

Someone said they replaces the transistor with SCR... is there reason for that??

SCR would let you control AC powered loads, like light bulbs, etc, thats all I can think of?!

[seanyiya]

I want to make a 10 LED sequencer, but with a little twist..
I believe using this diagram..
http://ourworld.compuserve.com/homepages/Bill_Bowden/4017-2.gif

What I want is when one light up, make it stay on... next one stay and on.... at the end of cycle.. all turn off...
Is there way to do that??
I've seen someone did it and told me that it can be done with this and replace the transistor with SCRs....
I'm kind of stuck at this now..... 

[Noodlenoggan]

This kit doesn't do exactly what you wanted but maybe some tweaking might work for you?

http://www.allelectronics.com/cgi-bin/item/AEC/305/LED_CHASER_KIT_.html

[seanyiya]

I finally got all the parts and put everything together..
It went well from first try... 

I want to use this a turn signal....
But I want little bit different pattern...
Is there way to make it stay on when it goes through the each sequence and turn all off at the end of sequence....
I've seen it somewhere but doesn't show how to do it....
Since this is gona be used with turn signal, so when signal is on it starts the sequence and turn them on... then when the signal turns off it turns all off....
Or is there better alternative??
I gotta think of using load resistor to slow down the stock turn signal....

My very first sequence circuit board....


Just short video clip...
Click here to watch MVI_124695

I've added potentiometer to see the sequence difference.... 50k ohm..
Click here to watch MVI_1248

[seanyiya]

I've switch to SCR for the transistor.... it seem to be doing what I want to do but some stays on but some doesn't..

Click here to watch LED-Sequence-3

[Anotherledmember]

Seanyiya:
I am impressed!  When you first asked what a 4017 is and why use SCRs, I though this was going to be a dead end post.  Then you provided video.  Then added a pot to adjust resistance to view the immiediate effect on the circuit from a change in a components value without first asking what will the change do.  Now see, that is how the good get better.  That is what I want to see, self initiation. 

When you replaced a transistor for an SCR, you meant only 1 transistor correct?  That load under the SCR will remain turned on once the SCR is triggered because SCRs are designed to stay on like latches.  4017's are good starts but after you do all that work to get the pattern you like, you most likely will want another pattern.  Unfortunately, 4017 is discrete and once a combination of connections and diodes are made, thats it, you are stuck unless you build another whole circuit.

I am feeling generous.  If you want I can send you a microcontroller chip with the pattern you want cheap.  I sell these pre-assembled, but you will not need my Leds, switches, and board.  I can give it to you with whatever patterns you want.  So when you get tired of a single pattern, you just switch to another.
This is what I am talking about http://www.anothercoilgunsite.com/8led/


 

[seanyiya]

Hello..
Thanks... I really want to learn this stuff cause I'm want to make my own custom LED pattern tail light and other brake light with patterns..
Puttting together circuit board wasn't hard... but getting into microcontroller was overwhelming...
I've looked into few thread in mircocontroller section and I was just lost...
I saw your microncontroller and it's something I might need in the future..

For now I need to figure out why the SCR isnt' functioning properly as I planned...
First circuit was with 10 transistor, then I replace those with SCR to remain turned on through the cycle.. then resets when power is removed...
So that when turn signal turns on, it starts the cycle, turns them on(also remain on) and end of the cycle turn signal turns off...
But weird part is that some stay on, some doesn't stay on... later on less and less it remains on when I try it multiple time...
Also weird part is that I thought it wasn't soldered on right so I re-heated the join and then LED stays on.. then when the SCR cool down it doesn't stay on....
Someone from other forum told me that 4017 doesn't output enough amperage to trigger the SCR, also use 10 uF capacitor... got lost from there...
I want to master this circuit before I move on to other circuits....

BTW, I making arrays with like 40-80 LED array with sequencing... does your microcontroller be able to control that many LEDs??
I would love to learn the microcontroller, but it's too much for me as of now...
Thanks for the reply... I thought no one was gona reply to this...

[Anotherledmember]

That chip has only 8 outputs another has 16.  The actual number of Leds is 8 or 16 x number of parallel Leds handled by an amp like, mosfet, igbt, buffer.  Those TO-92s are SCRs?  I am used to larger ones, forgot that some in small TO-92 package.  4017s are very low power providing chips but should still suffice for low power SCRs.  Those sized SCRs will turn on with < 10ma to gate.  Must put a resistor from gate to 4017 output though. SCRs have internal low value pull down resitors that suck up current if connected directly. 

[seanyiya]

That chip has only 8 outputs another has 16.  The actual number of Leds is 8 or 16 x number of parallel Leds handled by an amp like, mosfet, igbt, buffer.  Those TO-92s are SCRs?  I am used to larger ones, forgot that some in small TO-92 package.  4017s are very low power providing chips but should still suffice for low power SCRs.  Those sized SCRs will turn on with < 10ma to gate.  Must put a resistor from gate to 4017 output though. SCRs have internal low value pull down resitors that suck up current if connected directly. 

How hard would it be to run like example 4x8 array or 4x16 array with super flux LED using your microcontroller??

For the 4017 circuit...

So I would need to add resistor there where the arrow is?? and what kind of value are we looking at....
My circuit is, just like that with 2N9304 replaced with SCR(TO-92) which I got it from here
https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=119802
Data sheet here... https://www.jameco.com/wcsstore/Jameco/Products/ProdDS/119802.pdf
I thought this was enough to control the SCR.... I guess not...

I'll be adding voltage regularator to this circuit...
Do you think I need reverse polarity protection diode would be needed??

[seanyiya]

Using the same circuit..
I've made a police strobe.... 
Click here to watch LED-Polica-strobe-circuit

[Gabriel]

Thats very cool seanyiya did you just connected the leds in series?
and anotherledmember where can I find the http://www.anothercoilgunsite.com/8led/ schematic?
That pattern looks really cool i'm very interested.

[seanyiya]

Thats very cool seanyiya did you just connected the leds in series?
and anotherledmember where can I find the http://www.anothercoilgunsite.com/8led/ schematic?
That pattern looks really cool i'm very interested.

Ask Anotherledmember for that.. he sell the micro controller for that..

I've used same 10 LED sequence diagram...
I have two 3x5 array... from 10 sequence..  1st, 3rd, 5th sequence lights one left side array, then 6th, 8th, 10th sequence lights up right side array...
So you don't connect 2, 4, 7, 9 sequence, which skips that sequence...

[seanyiya]

I've tried using another SCR(more sensitive), since someone said ouput from 4017 is very low that it can't keep it open or something... but still no good....

Anyone can help out??

It's like a latching...
Just like this... I want to be simple as possible....
Using this diagram..
http://ourworld.compuserve.com/homepages/Bill_Bowden/page5.htm#4017-2.gif

1000000000
1100000000
1110000000
1111000000
1111100000
1111110000
1111111000
1111111100
1111111110
1111111111

[justDIY]

what do you want the chaser to do, once it's reached full on?

if you want a "bargraph" where you start with 1 led and work up to N leds, then you need a different chip ... there is another inexpensive bargraph driver IC that may do just what you're asking.  That is going to be the LM391x family, there's a few options, I don't know what they're for exactly.

I don't know enough about the analog world to be more help ... in the digital world, it'd take only a few min to code up what you want... but then there's the expense of a ic programmer and all that jazz.