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Adam Greig from Negative Acknowledge has developed a nice Nerf Sentry Gun, he used the NERF Vulcan which was the same gun I was thinking of using for my Nerf Gun project which is currently being finished but it was quite a bit more than the knock off that I ended up using. Via: Hack a Day “The gun itself is now running off a 3-cell lipo pack, which about doubles the rate of fire, and has three ammo belts chained together to give 74 rounds in one continuous burst of fire.”
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This robot by Oddbot is a great example of what can be done with IR light. `The eye consist of 4 IR LEDs and 4 pairs of photo transistors. The phototransistor pairs are connected in parallel to increase their sensitivity. The phototransistor pairs are then connected to your analog inputs the same way you would connect an LDR. This circuit is really 4 FritsLDRs but using phototransistors instead of LDRs. The main reason for this is that the lens on the phototransistors makes them more sensitive to light directly in front of them and because LDRs are very slow to respond to changes in light.`
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UPDATE: The project is complete have a look at everything here. Nerf Gun Hack part 1, part 2, part 3 This is part 2 of the Nerf Gun hack, you can see part 1 of the project here. Last time some wiring was done to allow us to remotely control the three internal motors. This time the control wires are connected to a simple circuit that uses two darlington transistors to spin up and fire the gun. A 16f88 PIC microcontroller is being used to monitor an IR beam and fire the unit when the beam has been broken. The IR beam consists of an Infrared LED and an Infrared Transistor. To determine when the beam is broken an analog reading is taken by the PIC when the IR LED is off and again when the IR LED is turned on. The difference is used to determine the state of the beam, if the difference is small the beam is not broken and if the value is large we know something is blocking the beam. When the beam is broken the controller turns on the first darlington transistor to spin up the rotating motors, then a short time later the second darlington is activated which fires the dart into the spinning wheels.
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UPDATE: The project is complete have a look at everything here. Nerf Gun Hack part 1, part 2, part 3 This is part 1 of a multiple part build of a Nerf Gun Hack which will monitor an area using a infrared beam and fire on anyone who walks through the beam. The goal which is just a loose guideline at this point is to have a microcontroller monitor an IR beam. When the beam is broken by someone walking through it the Nerf Gun will fire a dart (or several darts) in the location of the beam. I think there will only be one beam and the gun will be in a fixed position pointing at the area the person would be when the beam is broken, this could change along the way though. To fire the gun the microcontroller will need to simulate the same sequence as the operator pulling the trigger. See lots of pictures and some videos below. Selecting the Weapon The gun needs to be automatic so that it can be electrically controlled, this rules out many of the low cost units since most of them need the user to cock the gun (compressing the spring which propels the foam dart). There are a few manufactures who make foam dart guns, Nerf is the most popular and also the most expensive. I want this project to remain fairly inexpensive so the Automatic Tommy 20 by Buzz Bee Toys was selected.
Operation of the stock Automatic Tommy 20 Gun The gun takes 3 AA batteries which are in series to provide a 4.5 volt gun power supply. The gun fires a dart by spinning 2 ribbed wheels which are located in the front section of the gun directly in front of the darts. A dart is pushed between the spinning wheels which propels the dart out of the barrel. There are two trigger positions to allow the gun to function. Squeezing the trigger half way spins up the two motors in the front section, it takes about a second for the motors to attain full speed. To fire a dart the trigger is pulled all the way back, this ratchets the rotary dart holder by one location and then pushes the dart into the spinning wheels to fire it. If the trigger remains pulled all the way back the cycle continues until the user releases the trigger.
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How far can an R/C car jump? Watch the video to see the Guiness Book World Record R/C Car Long Jump that The Gadget Show performed. 
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Robert Oschler sent in this cool video which allows you to control a Rovio Robot using Mind Control. It uses the Emotiv system to allow the monitoring of your mind and other facial gestures. It isn’t a cheap technology yet but I think as this type of application catches on the pricing will fall. “The Emotiv SDK is a full-featured, professionally executed toolkit for quickly integrating the EPOC headset’s rich detection suite into your applications. As with any SDK, you do have to be a programmer (or at least know one) to make full use of it. But I believe even an advanced beginner would be able to do a lot. As for non-programmers, quite a few people have added support to other applications for the EPOC headset using the time-honored technique of keyboard stuffing.“ |
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In this GSR-Monkey (Skin Conductance Measurement System) Martin Sona uses the principle of galvanic skin response to plot some data onto a grid. Two people can be connected and monitored at the same time. I can imagine using this system as a two way lie detector, how often do you get to turn the tables when performing a lie detector test? “The hardware (besides the PC itself) consists of four parts: the electrodes, two little amplifiers, a delphi/C++/etc programmable USB-Interface and last but not least a black and more or less evil looking monkey. After experimenting a bit with other materials I decided to make my own silver/silverchloride (Ag/AgCl) electrodes. Nonchlorided electrodes on the skin can polarize after a while which means that they themselves work a bit like a battery and emit current.”
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