Hi,
I am trying to use only two columns only, DIG_0 and DIG_1 and all SEG lines ... using plain 5mm led diodes
I get very strange results... some diodes do not light up (not reversed... I tried)
Do I have to do something with unused columns? (resistor, diode ... something?)
Thanks
B
yes... just DIG2 to DIG7 are not connected to anything
Confirm you have used decoupling on the power pin (100nF ceramic).
Let’s see the actual wiring.
In the Arduino IDE, use Ctrl T or CMD T to format your code then copy the complete sketch.
Use the </> icon from the ‘reply menu’ to attach the copied sketch.
Schematic doesn't show the physical location of the bypass capacitor(s).
Is your display common anode, or common cathode?
If you are asking for advice about a custom board, you should provide a lot more information.
They are close to the actual chip…
Think the problem might be that not all DIG lines are used …
I’m using common 5mm led diodes
I thought someone has tried something like this…
Shouldn't be posting screenshots (because parts are cut off) - try and get the program to print the diagram as a jpg or png.
Not as such, but there is actually no point using less than four columns as the datasheet explains:
Well...
It actually almost works.
Part of the problem was code (I should have used GENERIC_HW for hardware type)
Other problem now is that ON is really really bright and OFF is half of that (still bright)
I use 2x8 3mm leds which are 18mA each ...
and... it's inverted ... full on when should be off
What is your I_SET resistor value?
Again,
Note the polarity of the diodes in reply #2.
I tried from 10k to 50k... about the same
It's not a display... just a series of 3mm white diodes (16 x 18mA)
I know. But the IC row/column drivers are not identical. They are polarized, and expect any LEDs that are connected to them, to be connected with the right polarity. Yours seem not to be... compare again with the example in reply #2 (did you?).
thanks, I'm officially an idiot ... it works now ... everything
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