Easiest Method of communication between 2 pics?

[jfk1965]

I have to send the value of an adc reading that I need to communicate from one pic to another what would the easiest way to do this?

The communication doesn't need to be fast as I only need to update the reading twice a second.

The method needs to be suitable for use through a digital optoisolater.

JFK

[sjbaxter]

The easiest way is to use the builtin UART and send the data as ascii data. You don't need a level shifter (i.e. RS232 transceiver) if the pics are close together (i.e. TTL levels and less than 18inches apart). But if you use a couple of opto isolators, then you increase the distance between the PICs as this is a current based line driver (i.e. 5mA or 20mA dependant upton the opto).

The latter is basically the signal driver and isolation that MIDI uses (do a search on Google) to talk between musical instruments.

As for the data transfer on this 'hardware link', there are plenty of examples of serial reading/writing all over this forum.
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Regards,
Simon.

[domdom]

Any working code i can try with minor modification?

[sjbaxter]

[Humberto]