#include <eracer.h>
#include <srf04.h>

#define US1Ping PORTB.4
#define US1Echo PORTB.7

#define AlarmDistance 50 'cm

DIR B7 IN

Main:
 Temp = USDistance(1)
 wait 10 ms
 if Temp < AlarmDistance then set green on
 if Temp >= AlarmDistance then set green off
goto Main
