Edit: Many kind users have posted solution different to that of a 4017, one using OpAmps and three using Logic gates (one using a 74HC04; NOT gates and two using 74HC14 "hex inverting schmitt trigger"). These circuits (not tested in real life yet) are supposed to give LEDs a psedo-random FADE in and fade out for esthetic purposes.This is why the title was changed for others to find a good solution more easily. If you want to, you could still read the original text:
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If you dont like long talk that is not needed. skit until the "TL;DR" part.
Hello! I am sorry if this is the wrong place to post, but i felt like the 4017 doesnt belong to the Embedded and micro section. if it does please tell me, i will close this thread and open one there, alternatively a moderator could move it.
You could have seen my previous (Waaaaaaaaaaaaaay too long) post (more like essay) asking to do this with programming MCUs, specifically 15 LEDs randomly fading and with a button press they would go in a sequence (They are tied to letters of someone's name) that spells out a joke (Example Mad Dad from Adam....) here: http://forum.allaboutcircuits.com/t...ble-microcontroller-for-multiple-leds.117905/
back then i felt the need for doing it how i visioned it (I was a perfectionist back then, but a small sour experience was enough to rip that out of me), and didnt take any proper advice that i should have.
i didnt have time to learn more programming ever since, so ive changed my mind
NOT TO BORE YOU WITH ANOTHER ESSAY, HERE IS MY PROBLEM(TL;DR)
I now want to just have randomly fading in and out LEDs that randomly fade (not a pattern). i want to use chips that dont require programming and heard many talk about 555 + 4017 or other chips, so that is what i need.
Also are EBAY listings like:
http://www.ebay.co.uk/itm/20Pcs-CD4...592812?hash=item3f56f147ec:g:COgAAOSwCypWmGTT
any good? will they come damaged? are there different types of this chip? Thank you.
.
.
.
.
If you dont like long talk that is not needed. skit until the "TL;DR" part.
Hello! I am sorry if this is the wrong place to post, but i felt like the 4017 doesnt belong to the Embedded and micro section. if it does please tell me, i will close this thread and open one there, alternatively a moderator could move it.
You could have seen my previous (Waaaaaaaaaaaaaay too long) post (more like essay) asking to do this with programming MCUs, specifically 15 LEDs randomly fading and with a button press they would go in a sequence (They are tied to letters of someone's name) that spells out a joke (Example Mad Dad from Adam....) here: http://forum.allaboutcircuits.com/t...ble-microcontroller-for-multiple-leds.117905/
back then i felt the need for doing it how i visioned it (I was a perfectionist back then, but a small sour experience was enough to rip that out of me), and didnt take any proper advice that i should have.
i didnt have time to learn more programming ever since, so ive changed my mind
NOT TO BORE YOU WITH ANOTHER ESSAY, HERE IS MY PROBLEM(TL;DR)
I now want to just have randomly fading in and out LEDs that randomly fade (not a pattern). i want to use chips that dont require programming and heard many talk about 555 + 4017 or other chips, so that is what i need.
Also are EBAY listings like:
http://www.ebay.co.uk/itm/20Pcs-CD4...592812?hash=item3f56f147ec:g:COgAAOSwCypWmGTT
any good? will they come damaged? are there different types of this chip? Thank you.
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