Joe Denehan wrote:
>
> -----Original Message-----
> From: joe_denehan@esatclear.ie [mailto:joe_denehan@esatclear.ie]
> Sent: Wednesday, March 28, 2001 7:56 AM
> To: Pic Microcontroller Discussion List
> Subject: [EE]: Taking reading from 7-segment BCD (TC4511)
>
> We have a machine where I work which if fairly old. When it jams it reports
> the error as a 2-digit code, displayed on 2 7-segment displays. I wish to
> capture the BCD input to the display using a PIC and translate this code to
> an error message which will be displayed on LCD. I have the circuit working
> on a breadboard but when I connect to the trigger LE on the display the
> trigger signal distorts ( measured with oscilloscope ) and affects the
> 7-segment display, I cannot get a reading. I tried a direct input into the
> PIC, I tried an Opto-isolator and also tried an Op-amp as an inverter and 1M
> resistors to limit the current draw but the signal still distorts. Can
> anyone suggest a way to get the trigger from LE without distorting the
> original signal?


Joe, you have been struggling with this
for a while, it really shouldn't be that
hard.:o)

Might I suggest showing us a circuit diagram?
-Roman

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