trouble with SRF-05 ultrasonic sensor and LCD issues

Hello every one. I have an awesome summo robot~(with IR and whiteline sensors) that kicked ass in the last summo competition i participated in. I lost 2 a guy with 6 motors and i only had four. Anyway I’m not complaining.
Well now i decided to add buttons an LCD and one ultra sonic sensor.
well the buttons work awesome but only half of my LCD works… the backlight doesnt even come on and it displays only half the screen. im using the exact set up i got on the arduino site but just changed the pins… this is what my code looks like…
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8,9,10,11,12,13);

void setup() {
// set up the LCD’s number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print(“hello, world!”);
}

void loop()
{
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(0, 1);
// print the number of seconds since reset:
lcd.print(millis()/1000);
}

BUT… my biggest issue is with the SRF-05.
i have tested it using a function generator and an oscilloscope and it works fine… trouble comes connecting it to the arduino .
i know i need two digital pins. one for the trigger and one for the echo but do they have to be PWM?
pleaase help thannxxxx alot

Do you have a link to info on the sensor?

but do they have to be PWM?

No, neither does (one is an input anyway)

Thanks guys. I can now read on my serial out. i can read centimeters. but now when im making conditions, do i put in centimeters

void loop()
{
if (distance = 100)
{
DriveForwad ();
}
else if (distance< 100)
{
Stop();
}

and my LCD is faulty. it has nothing to do with the wiring or my code. just tried someone else’s LCD and it worked perfect…

if (distance = 100)

BZZZZZZZZT!

Comparison, not assignment.

There is nothing in that sketch to read "distance" anyway.