A long time ago when a parallel printer
port was the standard,
i was thinking how to get the most led's on a 8 bit interface. And came
up with a simpel way to demultiplex. It can be used with dip-switches or
any other 8 bit interface like a usb i/o interface. I made a 256 run
light using two 74hct193
and a 74hct132. The resistor can/need to be matched by what type of
led's and power you use.
Parts are still available in Europe, for the usa don't know , but i
think no problem.
I just hooked it up an Arduino, via an 74hc595.
Works fine, programing is not so hard as i thought.
Never used a micro controler before.
I just hooked it up an Arduino, via an 74hc595.
Works fine, programing is not so hard as i thought.
Never used a micro controler before.
Project Description
I made a compact disign by using 2 standard PCB’s, 16 BC557AP and two 74154N ‘s
Figure 1 Circuit diagram
Figure 2 Front
Figure 3 Back
Works fine, programing is not so hard as i thought.
Never used a micro controler before.
