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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 17/05/13 14:39, tom wrote: > Some archaeologist friends are complaining about thieves who metal > detect at night. Wonder if anyone has come up with an effective jamming system for metal detectors. > My solution would be IR webcams (ie webcams with the IR filters > removed) Even with the filter in many cameras are still quite sensitive to both IR and UV. Maybe you'd instead want to replace the existing filter with a "low pass" one. Which would block visible light. On the other hand the "tealeaves" are probably carrying torches which would help spotting them. > a small PC running of battery/solar and a directional WIFI to send > info on certain motion detect signals. Stick something like that > out of normal reach and it should be possible to cover quite a > large area and volunteers could check streams and come and visit in > the case of intruders. Any ideas? An open solution to this could > apply for all sorts of situations. CPC were selling the Raspberry PI Camera earlier in the week, but appear to have run out now. The details are on their homepage. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iEYEARECAAYFAlGXKjYACgkQsoRLMhsZpFdt4QCZARhQztqNLhcLfpIeAr+me2ll 4fsAn0sj18ObXN4DxrMMWprvEO70FQ98 =q4k1 -----END PGP SIGNATURE----- -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq