[oopic] need help with my project

Hi, since now I've got the LCD working, I have a problem with the timing.
I'm building a project where it uses ultrasound to measure distance. It's a
lot like the SRF04, but I'm using an oopic-R, NE555 (as transmitter), and a
different receiver. The basic concept is that the oopic will enable the 555
to transmit a 40-kHz pulse out, start the timer (oTimer, internal clock),
and once received back, stop the timer and display the results on the LCD.
So far, I've used the oMath, oflipflop, oSonarDV, and the code out of the
oopic book for oopic-1 to enable/disable oTimer. None has worked. Note:
when the receiver receives a signal, the output swings to logic high, if
there is no signal, its logic low. For the transmitter, logic high will
enable the 555; a logic low will disable it.

This is not very urgent, but I do have a due date of next school year (Aug.
25; I'm going to enter it into the science fair), and I'm barely half done
with the entire project. I've been trying to resolve this for a while now.
Thanks to all.

Here's my current code:

oLCD Print = New oLCD;

oTimer TICS = New oTimer;

oDIO1 Echo = New oDIO1; // receive line

oWire Conn = New oWire;

oDIO1 Trigger = New oDIO1; // transmit line

oFlipFlop Math = New oFlipFlop;

oBit Operate = New oBit;

// Indicator

oDIO1 trans = New oDIO1;

oDIO1 rec = New oDIO1

oWire transW = New oWire;

oWire recW = New oWire;

Void main(Void)

{

// Sets up LCD

Print.IOGroup = 3;

Print.Nibble = 1;

Print.IOLineE = 14;

Print.IOLineRS = 15;

Print.Operate = cvTrue;

Print.Init;

Print.Clear;

// sonar I/O and timer

TICS.PreScale = 0;

TICS.Operate = cvFalse;

TICS = 0;

Echo.IOLine = 18;

Echo.Direction = cvInput;

Trigger.IOLine = 27;

Trigger.Direction = cvOutput;

Trigger = 0;

Conn.Input.Link(Operate);

Conn.InvertIn = cvTrue;

Conn.Output.Link(TICS.Operate);

Conn.Operate = cvFalse;

// Set up indicator (for debugging)

trans.IOLine = 5;

trans.Direction = cvOutput;

rec.IOLine = 6;

rec.Direction = cvOutput;

transW.Input.Link (Trigger);

transW.Output.Link (trans);

transW.Operate = cvTrue;

recW.Input.Link (Echo);

recW.Output.Link (rec);

recW.Operate = cvTrue;

// Set up math

Math.Input1.Link (Echo);

Math.Input2.Link (Trigger);

Math.Output.Link (Operate);

ooPIC.Delay = 200;

While (1)

{

ooPIC.Delay = 100;

Math.Operate = cvTrue;

Conn.Operate = cvTrue;

TICS = 0;

Trigger = 1;

ooPIC.Delay = 20;

Trigger = 0;

If (Echo == 0)

{

Math.Operate = cvFalse;

Conn.Operate = cvFalse;

Print.VString = Str$(TICS.Count);

ooPIC.Delay = 100;

Print.Clear;

}

Print.Clear;

}

}

_________________________

Ray Xu

rayxu@tx.rr.com

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