/* line following program - slide 42*/ /* place robot over dark line */ void main() { int dark; /* get the dark light value */ dark=light(1); printf("%d", dark); while(prgm_button()==0) { printf("%d" light(1) -dark); /* look for less dark by at least 30 */ if(light() < dark-30) { /* turn one way */ fd(1); off(3); } else { /* turn the other way */ off(1); fd(3); } } while (touch(FRONT_SENSOR) ==0) { // do nothing } // wait alloff(); }