/*finds ramp color and waits for start light*/
/*returns -1 for white, 1 for black*/

void light_sensor()
{
int course_side, light_reading, median_value=20, start_value=7;

/* light_reading=cds();
if (light_reading<=median_value)
course_side=-1;
if (light_reading>median_value)
course_side=1;
*/

light_reading=cds();
while(light_reading>start_value)
{
printf ("Waiting for Start %d\n",light_reading);
light_reading=cds();
}
printf("CdS Course %d\n",course_side);
}