Simple Touch Sensors With The Arduino CapSense Library

November 21, 2011 by Mike Szczys 10 Comments

Ever thought of using touch sensors on your projects but didn’t because it would be too much work? [Paul Stoffregen] proves that it can be pretty easy if you use the CapSense library for Arduino. Here he’s created three touch sensors, connecting them to the Teensy microcontroller with two resistors each. The larger resistor (looks like 4.7 megaohms here) sends a signal through the copper pad which is read by the secondary pin. Here that pin is protected from electrostatic discharge with the 1k resistors. The microcontroller takes a reading by measuring how long it takes the voltage to change on the input pin.

Since the CapSense library takes care of the timing involved in these readings, all you have to do is decide how your program will react to the numbers that are coming in. In the video after the break [Paul] is echoing the timing figures back through the serial monitor to get an idea of what the data looks like. He experiments with touching the copper directly, and touching it through a piece of clear tape.

We’ve seen the CapSense library at work before in this interactive exhibit piece.

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Stroboscope Project Uses Optical Drive Motor And Arduino

November 21, 2011 by Mike Szczys 11 Comments

In the quest for a diy laser cutter made from DVD burner parts (that hack’s still in the works) this guy ended up with a junk box full of optical-drive leftovers. He put some of that surplus to good use by building this stroboscope. As the media spins, the white LED just out of focus in the foreground strobes to freeze the little black figure in the same place. The effect, as seen in the video after the break, is a dancing figure created by the optical illusion.

This is the same concept as that amazing 3D rowing skeleton build, but scaled down greatly. Each of the silhouettes seen above are slightly different, showing one pose that makes up a frame of the overall animation. They’re laser cut, but some careful paper-craft could probably accomplish the same thing. Assuming you could keep them from warping when spinning at high speeds.

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An Exercise In Servo Voice Control With Android

November 20, 2011 by Mike Nathan 2 Comments

voice-controlled-android-lock

[Shazin] had some free time on his hands, so he settled in to do something he had been meaning to for a while – learn Android programming. He went an indirect route, and ended up using the Scripting Layer for Android (SL4A), which gave him a head start on the process. Sitting in between the Android API and scripting languages such as Python, SL4A allowed him the ability to apply something he was already familiar with to the Android environment.

He thought it would be cool to try building a door entry system which relied on voice commands to lock and unlock. Using the Google Voice API for Android and an Arduino, he built a small Python application that allows him to toggle a servo simply by talking into his phone.

The application on his phone communicates with an Arduino over WiFi, once Google Voice has decoded the command [Shazin] is giving. The Arduino controls a servo, which in theory could control the locking mechanism on a door.

After a bit of tweaking and some added security, his proof of concept could definitely come in handy.

Check out the short video below to see [Shazin’s] voice-controlled servo in action.

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Nuclear Taco Helmet Measures Reaction To Spicy Food

November 19, 2011 by Mike Szczys 4 Comments

Apparently there was a Nuclear Taco eating contest at the 2010 Codebits Conference. The team from altLab, a Hackerspace in Lisbon, didn’t partake but the discomfort of those that did was burned into their memory. This year, the altLab members decided to build a spciy taco monitoring helmet as part of the conference’s 48 hour hacking competition.

The helmet was inspired by those beer helmets that let you suck down two head-mounted cold ones through a forking straw. In this case, the beer has been replaced by bottles of milk to help quench your burning piehole. But if you do take a sip, observers will know because a flow sensor measures how much you suck down. There’s also a humidity sensor which monitors the sweat building up on your forehead. The Arduino that runs it all tracks this info and uses it to set the discomfort meter on top of the helmet, all while the audience gets a closeup from the camera projecting beyond the helmet’s brim.

We’re happy to say they won 1st place for the creation. Check out their 90-second presentation after the break.

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A DIY Audio Player For When All That Matters Is The Music

November 18, 2011 by Mike Nathan 16 Comments

orange-mepod

[Grissini] hasn’t had the best of luck when it comes to personal audio players. He estimates that he’s gone through about half a dozen iProducts/iKnockoffs over the years, which ultimately adds up to a lot of money poured right down the drain. Rather than lay down his cold hard cash for yet another music player that would succumb to a dead battery or cracked screen, [Grissini] decided that he would be better off if he built one himself.

His Orange mePod isn’t exactly the most attractive or sleekest music player out there, but [Grissini] says it works like a charm. An Arduino Uno powers the device, and he uses an Adafruit Wave Shield to handle the audio playback. Power is supplied via 4AA batteries which keep the tunes going for a reasonable amount of time, and afford him the ability to swap them out for recharging without much fuss.

The player was encased with some leftover cardboard and wrapped in bright orange duct tape, before being mounted on [Grissini’s] belt. He says he gets plenty of looks when he’s out and about, which you would expect from such a unique design.

Stick around to see a quick video of the audio player in action.

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Adding Keypad Security To Your Automobile’s Ignition System

November 17, 2011 by Mike Szczys 62 Comments

[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.

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Simple Telepresence Hack Lets Remote User Rotate This Laptop

November 17, 2011 by Mike Szczys 8 Comments

[Kris] wanted to make the telecommuting employees at his office feel a little more in control of their virtual presence in the office. He gave them a way to look around without needing to go into full-blown robotics. This laptop stand has a Lazy Susan connected to a servo motor to give the user control of where the computer is pointed.

We’ve certainly seen our share of really complicated surrogate builds like this balancing robot. There have been simpler options too, such as this smartphone-carrying motorized base. But when you get right down to it, the ability to pan the camera is probably good enough for most situations. [Kris’] solution can be built in an afternoon, using simple materials. The box is made out of MDF with a base for the laptop connected by the ball-bearing hardware that supports the weight and makes sure the servo is able spin it freely. It is driven by an Arduino which connects to the computer via USB; making it easy to control remotely. Check out a quick clip of the laptop going round and round after the break.

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