If you want to ensure that the phone does not trigger your explosives while you are setting up the device, use some longer wire to locate the phone a reasonable distance from the explosive, connecting the igniter end first, phone end second.

If you are concerned that someone else will dial a wrong number, set the phone to only ring when your specific number is recognized. This can be done a number of ways, depending on the model.

On cellphones it is *extremely* unlikely that any RF noise will cause the phone to ring. Even if that is the intent of the producer of said “noise.” The most likely result of broadcasts over a wide band is that your intended signal will be jammed and the phone will not ring when you call it.

All that said, I would not advise wireless detonation of any kind. It’s easy to forget any one simple precaution and kill yourself or someone else. You should never need to be far enough away that you can’t see your fireworks’ launch point anyway.

But thing again it would suck to have all your pr0n lost because of a wrong number :\

A far more interesting hack would have been to modify the firmware of the phone in such a way as to automatically answer a call from a specific number, then wait for the proper code to be entered by the caller, before finally vibrating the motor. with vibration set to off for all other functions, you have thus eliminated the dtmf circuit, while still safely adding n verification system before triggering.

I see the potential for this project to be fine for a number of *other* uses, but fireworks is not one of them. anyone with pyro experience will tell you. several people have defended the project for other uses, and i can agree with them at least on those points.

a marked improvement, that would make it much more reliable and safe, would be to route the speaker jack to an answer and dtmf decoder circuit. this way, the phone would pick up, and listen for a sequence code (or a number of codes, if you wanted multiple triggers). such designs have been around since the 80s (if not before).

the answer/dtmf decoder setup would add a lot to the safety factor, as well as make it far more useful.

yes terrorists use cell phones to set of IEDs, this is common and trival to do, and nobody is getting any new ideas from this guy’s post.

Blocking radio signals also sets off IEDs. Some terrorists in Iraq figured out that coalition forces have blocked radio detonators and have set bombs to go off when a signal is lost rather than by sending a signal.

They also continue to use radio detonators.

tech really isn’t the way to solve this problem, other than armor anyway.

@jimmys: actually the SSN would suffice for finding someone.

so, if this was posted as “how to make a remote controlled switch with a mobile phone” it would be ok?

this information exists and posting it here is no more dangerous than google indexing a site that has information. if you type “how to make _______ into google one of the first entries on autofill is “bomb.” People are searching for this already and the information is readily available. Deal with it, free speech ftw.

When the switch is set to ‘on’, the battery immediately begins feeding current (a LOT of current) to the thyristor, whether or not the cell phone is called.

So, to get this to work, the cell phone must be called within about 2-5 minutes of switching it on or the battery is dead and it will not burn the fuse.

Not the best solution for someone who wants to use it for naughty things….

When the switch is set to ‘on’, the battery immediately begins feeding current (a LOT of current) to the thyristor, whether or not the cell phone is called.

So, to get this to work, the cell phone must be called within about 2-5 minutes of switching it on or the battery is dead and it will not burn the fuse.

Not the best solution for someone who wants to use it for naughty things…