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A very simple example that demonstrates the use of while loops to blink two different User LEDs. LED1 blinks 10 times then LED4 blinks 10 times.

The LEDs for the MBED-SDK and the Bambino line of microcontrollers are mapped to the following LEDs:
{| border="1" cellpadding="5" cellspacing="2" align="center" style="text-align: center;"
|+ align="bottom"|'''LED Colors'''
|'''LED'''
|'''PIN NAME'''
|'''BAM210E'''
|'''BAM210'''
|'''BAM200E'''
|'''BAM200'''
|-
|LED1
|P6_11
|Yellow LED
|Yellow LED
|Yellow LED
|Yellow LED
|- 
|LED2
|P2_5
|Green LED
|Green LED
|Green LED
|Green LED
|- 
|LED3
|P6_1
|RED LED
|RED LED
|n/p
|n/p
|- 
|LED4
|P6_2
|Blue LED
|Blue LED
|n/p
|n/p
|- 
|}

 /*Program Example 3.1: Demonstrates use of while loops. No external connection required
                                                                                */
 #include "mbed.h"
 DigitalOut myled(LED1);
 DigitalOut yourled(LED4);
 
 int main()
 {
     char i=0;         //declare variable i, and set to 0
     while(1) {        //start endless loop
         while(i<10) {     //start first conditional while loop
             myled = 1;
             wait(0.2);
             myled = 0;
             wait(0.2);
             i = i+1;         //increment i
         }                  //end of first conditional while loop
         while(i>0) {       //start second conditional loop
             yourled = 1;
             wait(0.2);
             yourled = 0;
             wait(0.2);
             i = i-1;
         }
     }                  //end infinite loop block
 }                    //end of main


[[Image:BAM210_WhileLoop.jpeg|center|]]