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This is the page for the SRF08 Ultrasonic Ranger, with I2C interface.
It is available at a number of places including :
The datasheet can be found from the Rapid Electronics website, or there is a good resources at Robot Electronics
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Slingshot user guide 
#include "mbed.h"
#include "SRF08.h"
SRF08 srf08(p9, p10, 0xE0); // Define SDA, SCL pin and I2C address
int main() {
while (1) {
printf("Measured range : %.2f cm\n",srf08.read());
wait(0.1);
}
}
Danna Vila wrote: I am trying to compile the program but I get this error: " Undefined symbol main (referred from rtentry2.o)." in file "/", do not know how to solve it?
First check if your code syntax is correct, I think you write something wrong in the "main" definition. If you don't resolve, post your code here.
Danna Vila wrote: I manage to compile the program but It doesn't show the "prinf".
Have you read this? http://mbed.org/handbook/SerialPC
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If you need a Sonar sensor, you might also consider the Maxbotix EZ series Sonar modules (www.maxbotix.com) . It is smaller and has an analog out, so a single analog in pin can read it. It will run off 3.3V. Phidgets and Robotics Connection also sells them.