tmhrtwg

/* **********************************************
    Project 1b: relay switch

    The idea is to see if I can control the
    relay switch I bought.
********************************************** */
int relay1 = 11;
int relay2 = 10;
int relay3 = 9;
int relay4 = 8;

tmhrtwg

/* **********************************************
    Project 1a: parking sensor!
    tomhartwig.nl/blog/arduino-project-1a-parking-sensor

    The idea is to beep when you come close.
    ...and beep faster when you come closer.
    ...and to go berserk when almost touching.
********************************************** */
#include <NewPing.h>