--- Free commercial use, unwatermarked files, full electric diagram, link to the products, tweaks, settings and arduino program are on sale for 10 Euros via paypal, if you're interested write me a message, you will just have to basically assemble the object and load my program ---
--- components price tag approx. 10 Euros ---
Here is the first final version of the motion sensor mine. Range of detection and firing is 3-6 meters (depending on how strong are your springs). No need to have a mechanical trigger or waiting to press the button to fire the mine: everything is fully automatic. Just place and it is done!
The original program also includes a buzzer (to have an acoustic feedback of the explosion). Built-in delay on the sketch grants optimal calibration for the passive infrared sensor: no misfires at all.
The project will be updated in the future.
Obviously if you have knowledge of arduino and electronic components you can do everything by your own.
PLEASE NOTE: no commercial use unless you purchase full license!