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Lains. Over the last few years I've saved a number of interesting projects from across the web. Some I've found interesting, some I plan on eventually doing. I'll try to share about one a day or so. Contribute if you want or don't.

>>726 First is from when Hackaday was still alright, they published a video of a guy who sent a video camera through the postal system. http://hackaday.com/2013/04/10/hacker-sends-this-through-the-mail-to-record-a-video-of-the-process/#more-97462

>>726 This is cute and likely easy to hook up to run. https://vimeo.com/74826937

>>769 this looks pretty neat

>>776 Here is something similar too; http://www.instructables.com/id/Easy-Bluetooth-Enabled-Door-Lock-With-Arduino-An/

>>769 >arduino mega to read 4 piezos >using a servo to flip an RFID card over the reader I seriously hope you guys don't do this.

>>782 What would you do SHIGGYDIGGY-chan?

>>783 I would program a modest uC with an ISP programmer, add a sleep mode and change the RFID reader and servo by a simple relay or transistor to open the lock. This would use an insignificant fraction of the power their system is using. I would say they've also used an expensive audio amplifier to amplify the signals from the piezos into something the Arduino can read, I would have designed a simple circuit with 4 OP amps or just 1 op amp that could send an specific signal for each piezo for the uC to interpret. Only the arduino mega costs around $40, with all what they've used I would say it would cost quite a lot more. With discrete components and a uC chip it would've been less than $10, assuming the electric lock was already installed. I guess that program has been used to show the system in operation, otherwise it is redundant. They're not making anything, they're putting things together.

>>784 Isn't making something just putting things together? On a related note, here is a guide to making your own piezo crystals. http://makezine.com/2008/07/31/how-to-make-piezo-crystal/ Sorry for only posting links. If anyone has any relevant infographs or .pdf's , please add to the mix!

>>785 I meant there's no electronic design in there, they've just assembled things together and made a small program, at the end it is like using an excavator to dig a small hole instead of using a shovel, it all ends being highly inefficient in many aspects: power, space, cost... What many people don't seem to understand is Arduinos and similar boards are mostly meant for prototyping, but if they want to spend >$30 to make a clap controlled lamp I'm won't stop them. I'll contribute with some projects instead of just complaining about them. http://www.rmcybernetics.com/projects/DIY_Devices/diy-induction-heater.htm http://hackaday.com/2015/03/23/3d-spectrum-analyzer-uses-1280-leds/#comments http://www.megavolts.nl/en/projects/tesla-coils/175-audio-modulated-solid-state-teslacoil-v2-0 uzzors2k.4hv.org/index.php?page=drsstc1 http://www.easytreasure.co.uk/bfo.htm http://www.instructables.com/id/How-to-X-Ray/ https://www.youtube.com/watch?v=HWNhVWEF0Ho Pic related is a lightening detector, might be useful for photography and other interesting things like a lightening counter. I can confirm it works.

>>726 Build a super-tv-b-gone https://www.youtube.com/watch?v=v17o2itd-lU

>>816 http://www.instructables.com/id/DIY-TV-B-Gone-SHP-And-Save-45/ http://www.instructables.com/id/350-DIY-TV-B-Gone-Mico/ If you have an spare Attiny85 and anything to program it you can make your own TV-B gone. I did one a long time ago. >no resistor for each LED I know.

Build a Wartime Kitteh and DDOS Dog; Defcon 22 https://www.youtube.com/watch?v=DMNSvHswljM

>>726 heres a collection of projects; some interesting, some terrible, some cringy. A few good ones. Old site. http://www.rtmark.com/featured.html