Hi all, first sorry for my english, i am nativ german ...
Maybe someone can point me to the right direction: i have a small robot based on arduino. Now i want to make a "target", means to hide a small box somewhere in the room and the robot need to locate. IR sensor dont want because maybe the robot can not see the target (behind a wall for example). Sound i dont want because the target is maybe hidden for longer time and no one want to her the piep piep for few hours :-)
Any suggestions what type of sensor i can use for the hidden target?
Thanks in Advance and best regards from austria