RDAR : radar
detects if there is a particle in its range, broadcasts wifi signal if yes (or sparks)
radius/length is in life
tmp modes as well:
1. up line: scans a line up
2. down '' '' ''' '''
3. left ''''
4. right ''''
5. 45degree arc up
6. ''''''down
7. ''left
8. '' right
9. circle
uses: tripwires, laser activators with cray, bray..., sensor guns