I am making a system that will detect movement. The thing is that i need to implement an indicator (a 12V strobe) that will be placed 150 meter (about 500 feet away) open air. I am using an Arduino uno (next to the sensor) connected to a 12V relay. What would be the easies way to solve this? I do not think that 150 meter cable will be physically possible even if that would be the easiest way (can I use some amplifier?). If i need to use a wireless modul it needs to be something that I can get hold on very fast (like within a week) and simple to implement. Living in Stockholm, Sweden.
Any ideas are welcome!