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'display output'
1997\06\30@082554 by in Harris & Alison Smith

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Hi there Piclisters,
I have a question regarding reading the output of a 16c73a.
At the moment l use a laptop and a max232 interface to view what "state"
the pic is in.
It typically will output a single letter on change of state.
I would like to use another pic with perhaps a single 7 seg display to keep
track of what is happening.
The application is automotive so portability is the aim of the game.
I've had a bit of a look at some of the app notes but l'm still a "newbie"
code writing wise.
All the best
Kevin Harris

1997\06\30@114411 by Keith Dowsett

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face
At 22:05 30/06/97 +1000, you wrote:
>Hi there Piclisters,
>I have a question regarding reading the output of a 16c73a.
>At the moment l use a laptop and a max232 interface to view what "state"
>the pic is in.
>It typically will output a single letter on change of state.
>I would like to use another pic with perhaps a single 7 seg display to keep
>track of what is happening.
>The application is automotive so portability is the aim of the game.
>I've had a bit of a look at some of the app notes but l'm still a "newbie"
>code writing wise.
>All the best
>Kevin Harris

Hi Kevin,

There are several questions which spring to mind about your state display.

How much CPU time and memory does your originating 16C73 have spare?

How far away is your display from the 16C73

How frequently does the data change, and how soon do you need the display to
update.


A 16C84 is quite capable of handling 9600 baud comms and running a seven
segment display, or an LCD. However if you need 115k baud comms it will be
struggling to keep up.

If you want the status display some distance from the originating PIC you
might do worst than moving over to RS485 which offers better noise immunity.
Put a 16C73 on the recieving end and run the comms as fast as you like. If
you have the time to set it up I would go for an LCD display, it's neater
and a whole lot more flexible. You can even get meaningful messages rather
than just a number.

Hope this is some help,

Keith.
==========================================================
Keith Dowsett         "Variables won't; constants aren't."

E-mail: spam_OUTkdowsettTakeThisOuTspamrpms.ac.uk
  WWW: http://kd.rpms.ac.uk/index.htm

1997\06\30@170030 by Steve Smith

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Build your own PIC based test gadgets !

They are typically smaller than PC's and generally consume less power. They
normaly have a weight advantage as well. The advantage is you can also make
them 'GooN' proof by simplifying opperations to either totally auotmatic or
'Push this button and watch for the green light' When dealing with a factory
full of football hooligans this approach is essential for product opperation
let alone reliability.......

Steve.....

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