include the mbed library with this snippet

#include "mbed.h"
#include "uLCD_4DGL.h"

uLCD_4DGL uLCD(p9,p10,p11);//p28, p27, p29); // create a global lcd object

DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);

AnalogIn   Sensor(p20);

double dist(int x0, int y0, int x1, int y1) {
    double arg = (x1-x0)*(x1-x0) + (y1-y0)*(y1-y0);
    return sqrt(arg);    
}

#define N_BLOBS 50
int xs[N_BLOBS];
int ys[N_BLOBS];
int colors[N_BLOBS];

int main() {
    int i;
    int r;
    int side;
    int grav_x = 64;
    int grav_y = 64;
    int spread = 10;
    float pertub = 0;
    int grav_change_count = 0;
    double distance;
    int update_time = 0.1;
    for(i = 0; i < N_BLOBS; i++) {
        xs[i] = rand()%127;
        ys[i] = rand()%127;
        dist(64, 64, xs[i], ys[i]); // Find distance from center of screen.
        colors[i] = distance > 50 ? RED : distance > 25 ? GREEN : BLUE;
    }
    
    set_time(1256729737);
    
    uLCD.text_width(2); //4X size text
    uLCD.text_height(2);
    uLCD.color(RED);

    led1 = 0; 
    led2 = 0; 
    led3 = 0; 
    led4 = 0; 
    while(1) {
        time_t seconds = time(NULL);
        
        uLCD.locate(1,2);

        if(grav_change_count++ > 30) {
            grav_change_count = 0;
            //grav_x = rand() % 127;
            //grav_y = rand() % 127;
        }
        
        update_time = 0.009/(Sensor+0.00001); // Max update rate is 0.009, min rate is 900.
        pertub = 10*Sensor;

        for(i = 0; i < N_BLOBS; i++) {
            uLCD.pixel(xs[i],ys[i],BLACK);
            //r = (rand() % 4);
            r = (rand() % 4)*(1 + pertub);
            side = rand() > (RAND_MAX/2);
            
            xs[i] -= (xs[i] - grav_x)/spread; // += or -= determines replusive or attractive force
            xs[i] += side ? r : -r;
            xs[i] = xs[i] < 0 ? 0 : xs[i] > 127 ? 127 : xs[i];
            r = (rand() % 4)*(1 + pertub);
            side = rand() > (RAND_MAX/2);
            
            ys[i] -= (ys[i] - grav_y)/spread;
            ys[i] += side ? r : -r;
            ys[i] = ys[i] < 0 ? 0 : ys[i] > 127 ? 127 : ys[i];
            
            distance = dist(64, 64, xs[i], ys[i]); // Find distance from center of screen.
            colors[i] = distance > 50 ? RED : distance > 25 ? GREEN : BLUE;
        
            uLCD.pixel(xs[i],ys[i],colors[i]);
        }

        //        led1 = (Sensor > 0.2) ? 1 : 0;
        //led2 = (Sensor > 0.4) ? 1 : 0;
        //led3 = (Sensor > 0.6) ? 1 : 0;
        //led4 = (Sensor > 0.8) ? 1 : 0;
        //wait(0.1);
        //led1 = !led1;
        wait(update_time);
//        uLCD.cls();
    }
}