Hi Everyone,

I am stuck with a problem I just can't seem to find an answer to, maybe
someone can shed some light.

My project uses serial comms to connect to other devices: What would be the
best way to implement little 3mm LED's to indicate the RX/TX status ?

I can't decide on a solution, because from what I have seen in the past,
driving an led from a outpin on a PIC, seems to consume all the current, so
that there is none left to drive an input on another input pin of a TTL ic
for example. So I will see my RX/TX status, but the signal will not get to
to my driver device. I thought of using something like a buffer driver, to
drive the led and to leave enough current to actually drive the rest of the
circuit. Am I supposed to use some current limiting resistor on the led?

I hope this will be clear. What will a common industrial solution be to this
problem?

Conrad

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