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27 Jan 2011

electronics-diy.com writes:

Solid State Relays are available almost everywhere these days, however they remain very expensive. Therefore, your efforts to build one yourself pays off. Especially since it only needs a handful components and the circuitry is simple and straightforward. A Solid State Relay is actually not a relay at all. There is no ‘relay’ present, just the electronics which does the switching. It works the same way as a relay; you can use a low voltage to switch a higher voltage or better.

Solid State Relay – [Link]

24 Jan 2011

This project is a X-Y plate with a ball on top. The motors control the plate in such a way that the ball always remain on top. This includes controlling of servo motors and visual recognition of the ball using a web camera.

Ball on Plate Control – [Link]

23 Jan 2011

This project by Billy Chasen shows how to make a door able to be opened and closed via a text message. The device uses a Propeller-based Spinneret Web Server and SMS gateway called Twilio. For security, there’s a whitelist of permitted senders.

Opening a door via text message – [Link]

20 Jan 2011

Randy writes: [via]

I needed a foot switch for my DSLR camera so that I could take hands-free pictures. On a long-shot, I went down to the local Radioshack to see if they had one. As expected, they didn’t have any camera foot switches, but I did luck out that they had all the parts necessary to build my own. Here is how to throw together a 5-minute camera foot switch with easily obtainable parts from Radioshack.

5-Minute Camera Foot Switch – [Link]

16 Jan 2011

This must be the smallest TV-B-Gone implementation, a device that can switch off almost any TV set. µTVBG is small enough to fit in your pocket and it is based on the ATTINY85 implementation by Lady Ada. All parts are SMT 0603 parts, the transistors are the good old BC850C and as IR diodes the author used the Osram SFH 4600.

uTVBG – World Smallest TV-B-Gone clone - [Link]

11 Jan 2011

This article shows how to make a air gap high speed flash. With this flash you are able to capture a bullet in the air. The circuit uses a 35,000 volts capacitor. glacialwanderer.com writes: [via]

In my quest to capture amazing high speed photographs I notice that when photographing shooting bullets the bullets were blurred. I found that standard xenon tube, which standard flashes use, is very bright for the energy put into it because of glowing xenon gas. The book Electronic Flash Strobe by Harold Edgerton explains all the calculations, but in practice this means all the flashes from Nikon, Canon and others that use xenon flash tubes have a minimum duration of 1/40,000th of a second. That’s fast enough for most things, but not for a shooting bullet travels around 1000 feet/second. In 1/40,000th of a second that bullet can travel about 1/3rd of an inch leading to blurry photographs of bullets.

High Speed Air-gap Flash - [Link]

7 Jan 2011

Tweet-a-Pot: Twitter Enabled Coffee Pot using an Arduino and power switch tail. [via]

Like the idea of making coffee on the fly? from your bed? While you’re on the bus coming home? Then the Tweet-a-pot is for you! Tweet-a-pot is the next in fancy twitter enabled devices. This coffee pot enables its owner to make a pot of coffee from anywhere they have cell phone reception, using twitter and an arduino board.

Tweet-a-Pot: Twitter Enabled Coffee Pot – [Link]

4 Jan 2011

This instructable shows you how to take timelapse photos with almost any camera. The best part is you do not have to tear your camera apart and it is low cost. [via]

Timelapse Photos With Your Camera – [Link]

4 Jan 2011

This project is a virtual bike riding program. Using a few simple electronic components and some software you too can ride in virtual style! A sensor from a bike computer is used to detect the rotation of a bike tire. The output of this sensor and the turning angle (controlled by the thumb joystick) is read by an Arduino and relayed to a computer over a usb cable. The computer reads the number of rotations and angle of the joystick and uses these values to control a virtual bike within google earth! [via]

Bike controller for Google Earth - [Link]

4 Jan 2011

Markus got his hands on some old split-flap displays from a train station and build a controller for them. The controller is based on a PIC 12F683 and is using optocouplers to isolate the 42 volts display motors from the driver circuit. The unit is able to control 8 of the segments.

DIY Split-flap display driving circuit – [Link]





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