Figuring out NPN logic for LED control

184

02:37:21

Some of my first shots at circuit design... I’m trying to make various LED signs and have them flash in different orders and such... 

For this project, I want to display 4 groups of approx. 16 lights per group; with each group coming on in succession and holding until all groups are lit, then reset and start over. Sounded simple enough... lol! Here I am several hours later, and this is how far I have gotten... yay me! 

Flip the switches on the right (logic fashion, it’s an OR gate, and I’m simulating a decade counter with the switches - so only one should be “on” at any given time for the pulses of 0,1,2,3) to make zee LEDs light!

published 7 years ago

Issacsutt

7 years ago

Is this what your trying to achieve: http://everycircuit.com/circuit/6714670718386176

Issacsutt

7 years ago

...If so, there are a bunch of ways to do that, many people will go the op amp route, but if you plan on having 4 groups of 16 LEDs sequencing in that way, then your gonna need a pretty good buffer that can handle a current draw of: 1.28 Amps....(16 × 4 × 20mA)

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.