Fresh hacks every day
For those unfamiliar with Ham Radio, there are lots of fancy tools these days to make it easier for the radio operator. But enthusiasts still like to get back to basics, and one way to do this is to participate in Straight Key Night. This is when you pull out your traditional Morse code keyer and have a chat with others around the world. The most recent event was on New Year's Eve. The only drag … [Read more...]
The tank robot builds that we see are often quite complex. This lets them do great things, but makes the platform scary for beginners. Here's a tank build that would be a great first project, especially if you're more interested in the programming side of robotics than you are in the hardware itself. [Paul Bleisch] combined several different commercially available products to fabricate this … [Read more...]
[Chris] tried his hand at using Optical Character Recognition in his server power monitoring rig. The image above is what the IP camera used in the setup sees. He's included a bright light to ensure that the contrast is as great as possible. After applying a threshold filter to the captured still, he is able to process the image to test all seven segments of every digit. He uses Mathematica for … [Read more...]
For [Davide Gironi] made a holiday tie tack this year. It's not made to look like Santa Claus, Frosty, or a Christmas tree. He simply wishes you a Merry Christmas ('Buon Natale' in Italian) by flashing the message in Morse code. Two LEDs have been added to a plain tie tack. It is tethered to the logic circuitry that provides power and drives the red and blue lights accordingly. As you can see … [Read more...]
You can leave the TI graphing calculator at home thanks to this web-based TI-83 and TI-84 emulator. As with pretty much all emulators, this depends on a ROM image from the actual hardware to work. But if you have one of the supported calculators (TI-83+, TI-83+ SE, TI-84+, or TI-84+SE) you can dump the image yourself and this should work like a charm. [Christopher Mitchell] calls the project … [Read more...]
[Matt] literally finds himself in a sticky situation. There's an oil slick in his sump well. These wells work in conjunction with drain tiles to pump water away from the foundation of a house. Unfortunately the tar that was used to waterproof the outside of his foundation is also washing into the sump and gumming up the works. The system he built will sound an audio alarm and send an email if … [Read more...]
[Manish] packed lots of functionality into this radiation sensor module. The device is completely solar powered and weatherproof, so it can be mounted anywhere. It uses a Geiger Muller tube to monitor radiation and connects to the internet using wifi network to report the readings. The design uses an Arduino Pro Mini to perform the monitoring and reporting. Wifi connectivity is provided by a … [Read more...]
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