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LDmicro Forum - problem with port A - 16F877A |
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problem with port A - 16F877A (by Alex)
Hello, i hava made a ladder that toggles 2 leds (ladder attach), the thing is that all outputs are in port A and all inputs are in port B, specifically port RA4 keeps in one state all the time, but when i change port RA4 to port RD1 i works ok, i am using relay arduino board that works with low level, would it be possble some noise causing this as all outputs are close togheter, watch video please:
https://www.youtube.com/watch?v=PsopEd3PRlE&feature=youtu.be
(no subject) (by José)
I'll test your ladder tonight with another 16F877 board, and let you know if it works or not...
José PS: which version did you use ?
DRIVING LEDS WITH OPEN DRAIN PORT EXPANDER OUTPUTS (by Ihor Nehrutsa)
RA4 - Output is open drain type. See the pdf.
https://www.maximintegrated.co...ocuments/app-notes/2/2198.html
(no subject) (by José)
Ihor is right ; it seems to be the explaination for your pb ! Search for "open drain" in his attached pdf.
(no subject) (by Alex)
thanks all for your reply, i´ll check it :)
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