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From: "Robbie Banks"
Subject: Problem with microcontroller
Date: Wed, 11 Dec 2002 09:52:54 -0000
NNTP-Posting-Date: 11 Dec 2002 09:52:43 GMT
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Can someone suggest something to sort this problem out?
I have a 16P871 which I am using as a traffic light sequencer. The outputs
of the sequencer are NMOS to control the optocouplers which in turn switch
triacs for the lights. I also wish to have a LED display on the box to show
the user what phase is running on the lights without having to stand infront
to check. The problem is, when I split the output line from the
microcontroller to the both the optocoupler and the LED, the signal level
drops to such an extent that it won't work. I've tried putting in a driver,
but this still doesn't sort the problem. I'm guessing it's either the
voltage drop across the LED diode mucking up the logic levels or that the
ucontroller can't handle sinking both currents.
Does anyone have any suggestions
Thanks in advance
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