Example of multi plexing

165

01:55:41

Basically this is in slow motion in real time it would be going so fast it would look like they are all on. So basically we turned on 9 LEDs with 3 resistors and only 6 pins and with a bit of code you can control each LED normally. Pros : use less pins Cons: more complex 

published 8 years ago

aurumhype

8 years ago

Any questions hop on discord and o can try to answer them.

ViolationMad

8 years ago

The resistor limits the current to ca. 15mA which is ok for just one led. When you divide it by 4 its not a lot for each led.

hurz

8 years ago

This has to be voltage driven. Buy a bunch of 2V LEDs and match them as close as possible http://everycircuit.com/circuit/6538027886444544

eekee

8 years ago

Or give each LED a resistor. I'm sure integrated LED matrices have resistors too.

aurumhype

8 years ago

The purpose of this is so you only need 4 resistors. Only one LED per resistor should be on at one time.

aurumhype

8 years ago

Updated it to be a bit better of an example with automation.

hurz

8 years ago

You need for each LED a resistor or you can only lightup one row or column at a time. If you have more LED on at one resistor the current does divide and the LEDs will drop in light.

aurumhype

8 years ago

Yes that's the point. Only 1 LED on at a time per row

aurumhype

8 years ago

Could not get logic on here right so there is a bit of hangover but it should get the idea across.

hurz

8 years ago

After you updated your description according to our input, check this and its description http://everycircuit.com/circuit/5093065160392704

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.