Shake Phone To Start Scooter

June 18, 2012 by Mike Szczys 14 Comments

This scooter starts right up with a shake of your Android device. This shake must be done from front-to-back, because a side-to-side shake is reserved for unlocking the saddle ([Brad] stores his helmet within).

Connectivity is facilitated over Bluetooth, with a rocker switch near the left handle bar to disable the receiver so that you don’t run down the battery. You can see the locking panel hanging open on the front portion of the scooter. Inside he installed the driver board which patches into the ignition system and drives a solenoid for the seat latch. It sounds like the latching mechanism used a bowden cable whose handle was inside that locking panel. By adding a solenoid and generously lubricating the cable he managed to get it functioning from the driver board.

Check out the video after the break for a proper demonstration. The phone is running a Python script via SL4A, which takes care of the user interface.

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Motion Sprinkler Chases Away Defecating Dogs

June 18, 2012 by Mike Szczys 36 Comments

Don’t want dogs pooping on the front lawn? You could put up a sign, your could chase them away like a crotchety old miser, or you could build a motion detecting sprinkler system. It’s pretty hard to line up for a doody when you’re getting sprayed in the face (or worse) with cold water.

The setup is pretty simple. The bump-in image above shows the view from a webcam. The server monitoring the video is running software that detects motion between one frame and the next. When it sees something in the right position it signals an Arduino to trigger the solenoid which has been holding back the water. Check out the movie after the break which shows [Phil Tucker] tramping across the grass to trigger the trap.

Sprinkler hacks are always a lot of fun. This variable-range sprinkler is still one of our favorites.

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Toaster Oven Reflow Project Goes Way Overboard

June 18, 2012 by Mike Szczys 29 Comments

This project may take the cake on high-end reflow retrofits. It’s a HUGE project which uses a toaster oven to reflow surface mount circuit boards. And the fact that it bursts with features makes us giddy.

So what parts have we come to expect on these devices? Obviously a heat source which usually comes from a reused toaster oven. Then you need a way to switch the heating elements on and off based on feedback. Since solder profiles have precise timings and temperatures a clock is usually involved. All of this can be done with a temperature probe on a multimeter and a smartphone as the timer. But what we have here is full-automation and then about a thousand more features.

The driver above has a full user interface. It’s got its own PID routines which help to ensure proper holding temperatures and accurate ramping when going from one temperature to the next. The cable exiting the controller below the red buttons is providing feedback via a thermocoupler. So program in your solder profile and let it go. But wait, don’t you want to record and graph what actually happened during this reflow run? Well that’s what the serial connection is for. In fact, you can even load new profiles and control all aspects of the device from a PC interface.

Switching for the toaster oven is done in a different way as well. Instead of just switching mains power, the circulation fan and the heating elements have been electrically separated. This way the fan can run whether the elements are on or not.

New And Improved Potentar

June 18, 2012 by Mike Szczys 12 Comments

We like what we’re seeing and hearing with [Dorian Damon’s] newest version of the Potentar. This is revision 2.0 of the instrument we saw in a December links post. He calls it the Potentar, since it uses a linear potentiometer in a way similar to how the frets on a guitar work (Potentiometer + Guitar = Potentar).

The first thing you should notice is the case upgrade. The original used what looked like unfinished scrap wood, but finished wood of this case really makes the thing look like a traditional instrument. With this design he loses the Arduino in favor of a standalone ATmega328 chip. You’ll notice knobs and a switch on the face of the body. This allows for selecting a couple different kinds of scales and turning the power off. The linear potentiometer and sewing machine button are the same as before. After the break you can catch his description and a quick performance thanks to the audio jack for patching it into an amp.

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Building A Bug-zapping Lightsaber

June 18, 2012 by Caleb Kraft 25 Comments

[youtube=https://www.youtube.com/watch?v=w0a34ivs0xo]

I have heard the joke several times that a light saber would make a great bug zapper. However, when [Ricky Sumbody] requested it on Facebook, I thought “why not?”. [Ricky] made a common mistake, he thought the bulb was the part that actually zaps the bugs. A quick google search revealed that many people had the same thought. I decide that, even though building a functional bug zapping light saber might not look as cool, I was going to do it anyway.

If you’re going to follow these instructions, be aware that this is a device that is literally designed to shock things to death. It is dangerous.

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A Game Of Skill For The North Carolina Maker Faire

June 18, 2012 by Brian Benchoff 4 Comments

The North Carolina Maker Fare was last weekend, and over the course of the festivities [Dave] was asked for the documentation for the arcade game he built. It’s a neat build, so we’re very glad he chose to share it with us.

Anyone who has been to an arcade in the last 15 years has seen the game [Dave] was inspired by. The object of the game is to hit a button when the sequentially illuminated lights are in a particular position. [Dave] built his own version out of 90 LEDs and a very tiny FPGA dev board.

The 90 LEDs are controlled by the FPGA using charlieplexing, and are illuminated in sequence when the game starts. A heavy-duty emergency switch button modified into a momentary push button takes a hit whenever the player thinks the LED will land in the ‘jackpot zone.’ If the player wins, a buzzer sounds and much excitement is had by all.

Seeing as how the arcade version of this game is a complete rip off and is impossible to win, we really like [Dave]’s version. You can check out his demo video after the break.

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A LEGO Turing Machine For [Alan]’s Centennial

June 18, 2012 by Brian Benchoff 12 Comments

2012 is the 100-year anniversary of [Alan Turing]’s birth, and to celebrate the centennial, [Jeroen] and [Davy] over at Centrum Wiskunde & Informatica in The Netherlands built a Turing machine out of LEGO.

A Turing machine is an extremely simple device, but is still able to compute everything your desktop can. The machine is generally described as an infinite paper tape with a read/write head. On this paper tape, the numbers ‘1’ and ‘0’ are written. By precisely defining what the Turing machine should do when it comes across a ‘1’ or ‘0’, its able to do the same calculations as a laptop, albeit at a much slower rate.

The LEGO Turing machine has a series of pins signifying each bit. These pins are moved underneath a read/write head containing a light sensor and robotic arm. When a pin is down, the camera sees a dark spot signifying one state. When the pin is up, light reflects off a white LEGO piece signifying another state.

[Jeroen] and [Davy] built an IDE for their Turing machine, so if you’ve got a few LEGO NTX bricks lying around you can grab the Git and build your own. Check out the mini documentary after the break.

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