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a second prototype - and some bugs (by al1)

A project log for 4014 LED minimodule

A cheap, small module that displays two 7-segments digits with simple multiplexing

AlexAlex 09/13/2016 at 16:282 Comments

I did some home etching the last weekend and I thought that would be a opportunity to throw also some 4014 module PCBs in. This is the result a first rev2 board:

Beside that one trace with the capton tape the design is quite good to etch yourself.

I used the same software I uploaded in the files section with adapted port defines. But when reviewing my code I found something bad: I do not know why I did that, but the code does do some multiplexing to much, and lights only one LED on at the same time, must fix that later.
A second bug is in the schematic: On of LED B1 (1=left digit) or F2 is the wrong way around. So far I did saw B1 as wrong (only important for the software).

The boards I order at OSH-park arrived also today. Will make some photos and soldering one soon. I did changed my order successfully to the rev2 boards so it should work with my type of LED.

Discussions

Yann Guidon / YGDES wrote 09/13/2016 at 22:58 point

OK I found the blunder, sorry ! I'm updating the files, thanks !

I swap F1.

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Yann Guidon / YGDES wrote 09/13/2016 at 22:55 point

Oh, did I let a blunder slip through my stringent review process ?

Which revision has the schematic bug ?

update: found :-)

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