Hacked Gadgets Forum

January 3, 2014

Gesture Based Security Lock Project

at 4:54 am. Filed under DIY Hacks, Educational, Electronic Hacks

Gesture Based Security Lock Project

 

Instead of using keys and codes for security this device that Ankur Thakkar, Darshan Shah and Saisrinivasan Mohankumar built as part of their ece4760 Final Project uses gestures to grant access. The system uses IR sensors to determine the movement of a persons hand within the detection area, after you train the unlock pattern you can simply repeat the pattern to activate the device. I think a small miniature version of this that can detect a finger instead of a full hand would be a great replacement of a typical keypad and would probably be able to retain a similar form factor. Nice thing about this technology is that it is contact free, these days no one likes touching things like keypads that thousands of others have potentially used before them.

“The IR proximity sensors gave us an analog voltage proportional to the distance of the sensor from a flat object placed in the user’s hand for drawing the patterns. The analog voltage from each of the sensor is given to the ATMega1284P, which utilizes the internal Analog to Digital Converter, to convert this analog voltage to digital signal which can be utilized by the microcontroller for further processing.”

 


December 6, 2013

MakiBox – What happens when you offer a $200 3D Printer

at 9:54 am. Filed under Educational

MakiBox - What happens when you offer a $200 3D Printer

 

We featured the MakiBox here before, taking about their inexpensive 3D printer (still the cheapest as far as I know). They have two models, one that goes for $200 and one that goes for $300. So what happens to your company when you offer a hot product at this kind of price? You get lots of orders and need to ramp up very quickly. They have a number of posts on their site showing how they are dealing with their growing pains. The one big advantage is that they are located in Hong Kong allowing them to throw a ton of people at the problem which you will see in the video, I don’t think this could be produced in North America for the same price when you need this kink of staffing to keep the gears cranking. I would have thought that one day after hiring a huge crew of people there would be mass chaos but they must have had one hell of an orientation day because everyone seems to be working at a furious pace. I guess it helps when they know they are being recorded for a blog post…

 

 


December 4, 2013

Ultrasonic Range Finder with Haptic Feedback called The Bat Hat

at 1:22 pm. Filed under Complex Hacks, DIY Hacks, Educational, Electronic Hacks

bat_hat_2

 

Jeff Buswell, Clifford Chou and Andrew Knauss from Cornell university made a cool Ultrasonic Range Finder with Haptic Feedback called The Bat Hat for their ECE 4760: Final Project

“For our ECE 4760 final project, we designed and implemented an ultrasonic range-finding hat that uses haptic feedback to alert its wearer about obstacles in his or her path. The hat is equipped with an ultrasonic transmitter/receiver circuit, which is capable of emitting short pulses of ultrasonic-frequency (approximately 40 kHz) sound, at a level of about 120 dB. These pulses then echo off the closest object in the line of sight of the hat and are picked up by the receiver. The time delay between sending the initial pulse and receiving the echo gives a sense of how far away the obstacle is from the ultrasonic sensor, which can be conveyed to the person by vibrating the hat at a level proportional to that distance.”

 

bat_hat


November 7, 2013

Teardown of a modern LED Light Bulb

at 4:59 am. Filed under Educational

 

If you haven’t ripped apart an LED bulb to see what makes it tick have a look at the video that electronupdate made showing what is inside a Philips A19 bulb which is a 60 watt incandescent replacement. It really shows you the world of difference between incandescent and LED! Watch the video below to see how simple the old style bulb is to make.

 

November 3, 2013

Energy Storage and Density

at 9:19 am. Filed under Educational

 

Mjlorton gives us a lesson on Energy Storage and Density. This will be of interest to anyone who makes projects that run from batteries.


November 2, 2013

Peltier Module Cooling

at 11:33 am. Filed under Educational, Electronic Hacks

 

If you have a project that needs some cooling you might want to look into using a Peltier Module. RimstarOrg found one in an old water cooler, with a bit of disassemble he found a system that consisted of a 12 volt transformer which feeds a small board which coverts it to 12 volts DC that the module needs and finally there is a small circuit which measures that actual water temperature to switch off cooling power when the water is cold enough. By disabling the temperature sensor he was easily able to freeze some water on the module in no time. You can see the full details of the experiment here.

October 9, 2013

Reverse Engineering a RGB LED Bulb

at 2:50 am. Filed under Educational, Electronic Hacks

Reverse Engineering a RGB LED Bulb

 

If you have ever wondered how one of those RGB LED light bulbs work have a look at the article that has put together. By monitoring the IR LED of the remote he was able to snif the IR remote codes for the functions. Once he knew the IR codes he used an Arduino to run through all of the byte sequences but unfortunately there were no easter eggs IR codes in the bulb. Since one side of this bulb has line voltage you must be very cautious when hacking it. Chr demonstrates how he works around this danger.

 

Reverse Engineering a RGB LED Bulb_2

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