[Mehdi Sadaghdar] never lets little things like fire, shocks, or singed fingers get in the way of his projects. His latest is a tutorial on making a simple electroshock device. A stun weapon creates a very high voltage, and is used in law enforcement to temporarily disable a person. [Mehdi] stresses repeatedly to not use this on anyone. If you do, he won’t like you anymore. Of course, if you’ve seen any of his previous videos, you know he’ll shock himself and set something on fire before the project is complete.
To create his stunner, [Mehdi] used a car ignition to produce a high voltage. The igniton coil, which is a specialized transformer, allowed him to generate the >10000V output needed for the stunner. The coil has a 60:1 ratio and is powered by a 12V DC supply. Since a coil is a short at DC, the system only creates a high voltage pulse when power is disconnected. However, the pulse was too short to create a satisfying arc. [Mehdi] added a capacitor, creating an LC circuit that oscillates as the charge decays, creating a nicer spark. He then used an RC circuit and a relay to create a simple oscillating switch. For the finishing touch, he created a spark gap on the secondary of the transformer with two nails. In typical [Mehdi] fashion, he nearly fried his digital caliper in the process.
The end result is a nice spark that warms the cockles of [Mehdi’s] fibrillating heart. We commend him for being such a brave masochist in the name of science. Check out his tutorial after the break!
Continue reading “[Mehdi’s] Shocking Stun Gun Tutorial”
[Hahabird] uses this screwdriver to start his car. Despite what it may look like, only this particular screwdriver will start the ignition because it still uses the key lock. What he’s done is alter the screwdriver to act as an extension for the key. It’s purely aesthetic, but you have to admit it looks pretty gnarly hanging off of the steering column.
The hack merely involved cutting off the unneeded parts of the key and screwdriver. With the shaft of the tool cut down to size he clamped it in a vice and cut a slot into it using a hack saw. From there he headed over to the grinding wheel and smoothed out the sharp edges.
The key itself had the handle portion cut off and was thinned on the grinding wheel to fit snugly in the screwdriver slot. To permanently mate the two pieces he used a torch and some silver solder.
[BadWolf] managed to make some free time to get back to his own electronic projects. This time around he’s created a security system for his car. It’s patched into the ignition, preventing the engine from starting when the key is turned. A driver must first insert the key, then type the combination on a keypad in the center console before the car will fire up.
While he was working on the project he also decided to add a start button to the dash-board (we think it does make it look like a later model vehicle). The keypad is driven by an Arduino Nano which has the start code stored in it. Power for the system is provided by a USB hub hidden behind the dash which he thinks will also come in handy with future hacks.
When the proper code is entered, you’ll hear a rendition of the Super Mario Bros. theme. The speaker also lends a pleasant beep with each keypress. See the demo clip after the break to hear it for yourself.
Continue reading “Adding keypad security to your automobile’s ignition system”
[Ed Zarick] built a module to control his vehicle which he calls the Jeeputer. The name’s a mash-up of Jeep and Computer; the device itself is a combination of Arduino, character LCD, and a collection of shift registers and relays for interfacing. Watch the video after the break to see what this can do. We were surprised in the beginning when he says that all he has left to do is remove the steering wheel lock and he’ll be able to drive using the interface, but we think he means type in a code to unlock the ignition, not remote control for his car. He then goes on to demonstrate garage door control, power cycling for CB radio, GPS, 110V power inverter, vehicle light control, and much more. This must be the most feature packed car computer we’ve seen so far.
Continue reading “Jeep-uter adds push button control to your vehicle”
[Jair2K4] likes his RFID almost as much as he likes his chaw. Ever since his car was stolen he’s had to start it using a screwdriver. Obviously this is not a good way to leave things so he decided to convert his starter to read an RFID tag. He installed an RFID transponder he picked up on eBay, wiring it to the ignition switch. He’s removed the clutch-check sensor and wired a rocker switch to enable the RFID reader. We presume the rocker switch will eventually be used to shut the car off as well.
While most would have purchased a key-chain RFID tag, [Jair2k4] went far beyond that and had the tag implanted in his hand. This is an honor usually reserved for pets and until he adds RFID functionality to the door locks maybe a key fob would have been a better answer. But, to each his own. See his short demonstration video after the break.
Continue reading “Start the car with a wave of your hand”
Picture this scenario: it’s 2 AM, you’re stuck somewhere you’d rather not be, and you’ve lost your car keys. If you can’t call the Auto Club, what do you do? Hotwire your own car, of course. Wired.com has a wiki article detailing all the things you need to do to get that car running: how to identify which wires to connect, potential pitfalls of newer cars that require an RFID chip in the key, and so on. Of course, hotwiring a car that doesn’t belong to you is illegal, but this is one of those skills-like lockpicking-which just might come in handy in an emergency.
[Photo: D.B. Blas]