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I/O pin anomaly. Input pin is sourcing current.

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PICMICRO

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I have been trying to implement charlieplexing of 7-segment display, and lately banging my head to find out, why the leds that ought to be OFF were glowing (all-bit dimly).
Here is what I was surprised to find out
View attachment 65568
 
I have been trying to implement charlieplexing of 7-segment display, and lately banging my head to find out, why the leds that ought to be OFF were glowing (all-bit dimly).
Here is what I was surprised to find out
View attachment 65568

hi,
Do you have the internal weak pull ups enabled on those pins.?
 
Opps! thanks erics. Internal Pull-ups were indeed the problem, and I went on creating a thread about I/O Pin anomaly.:p
I disabled it, and the LEDs work fine now.
 
Last edited:
Opps! thanks erics. Internal Pull-ups were indeed the problem, and I went on creating a thread about I/O Pin anomaly.:p
I disabled it, and the LEDs work fine now.

hi,
OK, you are having a bad week and its only Thursday.!:rolleyes:

E.
 
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