Send Email, Receive Surveilance Picture

This deathstar like ball is actually an autonomous surveillance camera. [Basil] wrote in to tell us about it. The body is custom designed for the project, then 3d printed.  It can be dropped anywhere, as it is battery powered for up to a month,  and communicates via cellar networks.  It checks an email folder once an hour and responds to any requests with a snapshot of what is going on. In the video, which you can see after the break, he gets an immediate response.  You can download the sourcecode as well as the files for the enclosure here.

If you wanted to reduce costs, that case could be done away with, but we suspect it helps with some moderate weather conditioning. We would also love to see a version that rotated around that equator on command for better pictures. Great job [Basil].

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Introduction To The H-bridge Motor Controller

[Chris] sent us this fantastic tutorial, introducing beginners to H-bridge motor drivers. While many of you will consider this stuff basic, those who are trying to expand from building only things the arduino board can handle to bigger more expansive (and powerful) projects will find this quite helpful.  [Chris’s] tutorial is very in depth, not only going through the construction of the basic circuit but also showing you how to make your own PCB.  Pop on over there and learn some theory and some practice. Then you can build that battle bot you’ve always been dreaming of!

1Hz Timebase

Check out this nice simple method of achieving a 1Hz timebase. This is basically a lesson in dividing crystal frequencies in circuits to get the desired result. In this case, they are starting with a 32.768KHz crystal and dividing it down. Instead of using an NE555 like many projects, he chose to go a direction that would yield results less prone to drifting with temperature variation. The method chosen was a CD4060 frequency divider, basically just a chain of flipflops. The divider is one step short of getting to the desired result so an additional flipflop has to be added. This is pretty basic stuff, but a great read. They go into detail as to how it all works and why you would use this method.

Pssst, hey, remember that time I told you to just use a 1Hz crystal? yeah, we can laugh at that again.

[via HackedGadgets]

Quick Project: Hard Drive System Meter

[Ginge] sent in this fun little project. He gave himself 3 hours to complete a hack (not including research time) and managed to come up with this cool activity meter. He handles the entire project like it is some kind of contest. Ground rules are laid out, requiring practicality of the final product, minimum investment, and almost complete use of junk pile pieces.

Using an old hard drive for the frame of the project as well as the “dial” part of the meter, he hacked together a system load/ hdd and proc activity meter. The brains of the project are an AVR and he even implemented some PWM to smoothing things out. He goes into some fair detail on the construction of the thing (was the writeup included in your build time? -50 points!). Even though he’s using a piece that he manufactures and sells (OSIF), you could probably figure out how to do it without.

You can see a video of it in action after the break

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Dino’s 2 Axis Camera Dolly

[Dino], who has become a regular face here on hackaday, sent us one of his weekly projects that we thought was pretty cool. He wanted to shoot some video of photographs to commemorate his late mother. The goal was to achieve the “Ken Burns Effect“, but in hardware instead of just doing it in software.  To do this, he built a 2 axis rig, very similar to many home made CNC machines we’ve seen. He used drawer rails and rollers and an old scanner for the parts.  We admit, at first glance we weren’t too impressed with the resulting effect. It is a bit shaky as he moves the camera and the zooms and slides don’t have that perfect smoothness that we have come to expect from modern video effects.  However, after a few minutes, it seemed so organic and pleasant that it won us over. This obviously isn’t what you would use for every project. This project, however, seems to fit perfectly.

If you still don’t like the effect, you could certainly find uses for this rig aside from video. You could use it (with backlight) for batch converting slides or other images to digital. It would work perfect as a 2 axis paper cutter. What other uses can you come up with for a 2 axis un-motorized frame?

You can watch the construction video after the break, and the result video on [Dino’s] page.

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Blowing Up Capacitors

[grenadier] wrote in to show us a video of some capacitors being blown up. Yup, that’s it. Just some capacitors being blown up. You might be wondering what there is to learn from this video. The answer is… nothing. It sure is fun to watch though. We’re all busy trying to find some nice hacks to share with you, so we figured you could watch some stuff getting destroyed while you waited.  Here’s someone using explosives to reveal art behind a thin layer of concrete on a wall. Here’s some high voltage destroying multimeters. How about a turkey being cooked with thermite? Thermite works on hard drives too.

Ok, enough of that. This was a gentle reminder to send us tips to your projects.

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RFID Smart Card Reader

[Navic] wrote in to show us his latest project. This is a portable smart card reader with a nice LCD display. he just happened to have a Basic Stamp 2px, smart card reader, and smart card reader/writer sitting around waiting to be used. What better use than a hand held smart card reader?  Tossing the bits together in a nice project enclosure, [Navic] scoured the code available to him and pieced together what he needed. Now, when you slide in a card, you get a nice readout of the data on that pretty blue screen. Unfortunately, if you pull the card before the read is finished, everything just freezes.

You can see the final video after the break, and you can also see some in-progress videos linked in youtube. He asks if he should add the ability to write, and we say YES. Store that data, then write (duplicate) to another device.

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