How do you plan on keeping that secondary detonator from exploding when you arm the device? Scratch that, looked at that little tester, very handy, and for some reason I thought you meant a second blasting cap, not a second circuit control device.
But then again, I'm more of a bastard in that if I wished a device to be anti-tamper it would be the following, A: it would be inside a black cardboard box with UV, IR, and Vis light sensing diodes, and B: looots of mercury switches. Go ahead, nudge that box.
P.S. X-ray sensor too.
I've heard of overpressuring the container with nitrogen (or whatever) and putting in a pressure sensor, putting photosensors inside material that should never be exposed to light (like inside the sides of a container or inside a chip), using capacitors as dead man's switch, etc. If you really want to be sure, I wouldn't use mercury switches. An accelerometer is a bit more expensive and generally not readily available, but immune to dry ice.
If you want to be the most evil **** on the planet, don't include an x-ray sensor. Use Delrin (sp?) and/or other x-ray transparent material. :)
You'd probably just end up killing a robot, but you'd become a celebrity to the EOD community overnight.
I kinda blinked when I watched Law Abiding Citizen. Dude used an iPhone as the detonation controller. He didn't bother to use the build in accelerometer to prevent tampering. I was very "WTF?"
One of my VFW friends got to play that Darwinian game in Vietnam. They had claymores rigged on the perimeter of their bases or camps and wired to a clacker that the guy on watch had. Charlie would sneak in quietly, turn the claymore around, sneak back a ways and then make an obvious noise. When the guy on watch poked his head up and hit the clacker he would take himself out. My friend's solution was to cannibalize thermostats for their mercury switch and rig them to his claymores as an anti-tamper device. When charlie came back in the middle of the pitch black night and started messing with the claymore, ka-boom.
Ayep. Exploding in place or hitting it with a water cannon is honestly the best solution. Screw messing around with defusing a bomb.