Hi, Sorry about that.  I'll try to be more clear with my explanation.
 
> > Hi, I'm trying to send an ID "1011001101" using PIC18f252 through
> > ultrasonic transducers.
> 
> How is this sent from the PIC ? Using the UART ? Or using a "normal"
> I/O pin ? And how fast ?
> 
> How long are the "0" and the "1" ?

I'm sending my ID through PIC18f252 through I/O ports in which the
transducer used is
MA403R.  The data sheet is a bit hard to find but it's only 2 pin with
one connected to the
I/O ports and the other one to the ground.  

My problem is how to code it in PIC.

> 
> What  "ultrasonic transducers" ? An URL to a data sheet would be fine
> if someone would like to look it up, but at least part number or "type"
> of transducer would/could help to know.
> 
> > My question is do i need to do something to
> > make sure that each bit (1 then 0 then 1 then 1, etc) are transmitted
> > for an equal amount of time? Maybe every 2 rising edge??
> 
> What "rising edge" ???

Sorry about this.  I was thinking about sending each bits of the id
for as long as 2 clock cycle which
I'm still not sure it's the right concept or not.

> 
> > Do I need to declare for each signal to be high and low for a certain
> > time or will it be automatically done?
> 
> Where would it be declared ? And who would do anything
> automaticly ? The PIC or the transducer ?
> 
For here, I meant the PIC.  There's nothing need to be done to the
transducer.  It's the PIC
that's hard to setup.

Thank you.
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