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With a few LEDs and some creativity you can put together some very impressive effects. The guys over at Freddiew’s Blog have put together a great video and a how to so that you can make your own LED Light Painting video. Via: Laughing Squid “It’s easy! Here’s what you need:
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Congrats to the guys at YourITronics, their BlueRover robot won 1st place in the Digilent Design Contest. `The idea of a remote controlled rover excites almost every electronics student and when we heard about the Digilent contest we realized that we have the possibility to make such a project real. We decided to build our own remote controlled rover but it had to be different from what we’ve seen before. We came up with the idea that we could control the rover by using accelerometer data and that we could use a second accelerometer placed on the rover to sense the driving surface.`
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Thanks to Dangerous Prototypes for sponsoring the contest this week. They will be providing a project that most of you have already seen! You will be able to test your own storage to death with your very own Flash Destroyer. The current count is just shy of 10 million which is my failure guess. If it doesn’t go soon who knows when it will fail. If you can’t wait you can also pre-order your Flash Destroyer now. “A PIC 18F2550 fills an EEPROM with values, and then verifies the content. Each successful write-verify cycle adds one to the counter display. When the EEPROM starts to have read verification errors, the writing stops and the number of successful write-cycles is displayed. This project was inspired by endless Slashdot discussions about solid-state storage. There aren’t any tubes or moving parts in the EEPROM that deteriorate, yet in a not-unreasonable amount of time the chip will cease to work. We find it fascinating and want to witness it first hand.” This contest will run for one week (June 5- June 11, 2010) . Ending time is based on central standard time. To enter, identify the item pictured above and give an example of what can be done with it. Please do not give the answer in the comments.
Send an email to contest @ hackedgadgets.com with “Name the Thing Contest” as the subject, and the message body consisting of:
The winner will be chosen at random from all of the correct entries. ———————————–———- Added June 26, 2010 The item to guess was the internal structure of a Mosfet The winner is Richard W. (there were 63 entries, this was a hard one!!) ————————————–———- Below is a pictures of the prize.
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The Geek Group has lots of interesting equipment but the Thumper Project is one of the most impressive. The system has gone through 7 revisions so far and more are in the works. Our friend Bob Davis has been making lots of similar devices but on a bit of a smaller scale. “Thumper is a High Energy DC Impulse Generator that is capable of producing a 1,800 Volt discharge of approximately 80,000 Amps for a duration of about 0.003 seconds. For a brief instant Thumper can output roughly 144,000,000 Watts, or more energy than most fair sized cities use at any given moment. Imagine that for a second. Take all of the electricity in every home, business, school, hospital, everything in your entire town….and run it through a pop can for just an instant. The capacitor storage banks are configurable for different voltage ratings, current ratings, and discharge times when needed. This is the standard 1,800VDC configuration that it was designed for and how it is usually operated as it’s a pain to change all the bank and cell jumpers. We operate Thumper at the 1,800 volt setting, but only charge it to 1,600 volts to be as nice to the caps as we can be as this is a particularly harsh use for them” |
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Vassilis Papanikolaou has made a nice Motorcycle Universal Gear Indicator Circuit which allows you to easily see what gear you are in. I am now curious how my first motorcycle indicated the current gear, there was a single 7 segment display between the speedometer and tachometer. I am guessing that it was probably all mechanical but who knows, it might have been this complex! Thanks sending it in Vassilis. “The main circuit is based on an AVR ATTINY25/45/85 microcontroller, which reads the signals of the two Hall sensors and the neutral switch and outputs the current gear number to a 7-segment LED indicator, through a 4026 counter/decoder.” 
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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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There was a thread over at DIY Audio that got Toon Beerten thinking about putting together a new amp. I have heard about all these strange amp classes but I haven’t been following them for many years. This Class D amp is actually a class T amp but because of some trademark issues it is branded as a class D. “I considered to construct the AMP6 kit from 41Hz Audio because of all the raving reviews. I went however with the 2*100 watt @ 4ohm TK2050 Class-D Audio Amplifier Board from Sure Electronics after reading this thread on the DIY Audio forum. The board is pre built (no need for soldering) and retails for a meagre 27€ (45US$). This is actually a class T amplifier, but that’s just a trademark of Tripath – the chip producer – for this class d amp.”
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