Im in need of help how to connect the parts together.
Hi, i know it sound that old but my assignment strictly says to use that LPT Port (DB25) which bugs me out.I don't recall PC interface simpler than the parallel one; anyway, I wonder if any OS in the world still provide support for such standard, even if it's still legacy in Windows Device Manager.
Did you even do a sketch of your diagram ?
Are you aware that any shift register IC can be cascaded output from one to input of the other ?
5) use D3 as OE.ASSUMING you can actually talk to your LPT:
1) Cascade the shift registers
2) Connect D0 of LPT to the input of the first SR
3) Use D1 as a clock
4) Use D2 as reset
Thought about that, but didnt know you can directly access the control lines. But, if you can, then two latches and two latch_enable signals is definitely the easy way to go.I would do it differently. The LPT port has 8 data bits and several control lines. Each has a hardware (or virtual) address. I would use two octal latches, they generally have a higher output current capability than a HC595, then wire their latch enables to two of the control lines.
Brian.
It's obviously a homework, but why train your students to design something based on obsolete technology? Do they draw their schematics on papyrus with a quill?Hi,
I see it as a kind of school project and it´s not to find a better solution, but to solve the task with using the LPT and the HC595 to control the LEDs.
Still it´s some kind of homework ... and the OP does not show what he has done so far.
Klaus
Maybe because the teachers are outdated?but why train your students to design something based on obsolete technology? Do they draw their schematics on papyrus with a quill?k
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