December 31st, 2009

Happy new year 2010 POV

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I would like to wish my readers a Happy New Year and may all your wishes come true. As you may have experienced, during the holidays,  hobbyists get some free time and they like spending it building stuff. In this case the author, Infernoz, build this 8 LED POV display, which seems like a fun way of wishing a happy new year. The device is based on the Attiny26 from ATMEL and from the video we can see it works quite nice, but unfortunately I was unable to locate any source code posted on the project page, but this is not that bad as you can find POV source code from others projects(POV1 POV2 POV3) if you’re interested in building one.

Happy new year 2010 POV: [via]

April 26th, 2008

DIY Lux Meter

DIY Lux Meter Assembled

The Lux Meter is usually used to measure illumination. The illumination is how level of luminous flux is falling on a surface area. The luminous flux is visible component that is defined in radiant flux (light power) divided by relative sensitivity of human eyes over the visible spectrum. This means the Lux is well fit to light level from sense of human eyes.

However there is a difference between spectra response of ordinary silicon photo diode and human eyes, it cannot be used for the lux meter. Some photo diodes for illumination sensor have a color compensation filter on the window to correct its spectra response.

DIY Lux Meter: [Link]

April 1st, 2008

ATtiny26 Accelerometer

 ATtiny26 Accelerometer assembled

The aim is to build a meter which measures the lateral acceleration force in car, also called g-force or centrifugal force. This is the force which pushes the driver or passenger to the left in a fast right hand turn. The force is normally expressed in g, 1 g (9.8 m/s/s) corresponds to the acceleration due to gravity.
A normal car can handle approximately 0.8 g, above this values, the tires cannot handle the sideways force anymore and the car will move sideways. The best sports cars can handle up to approximately 1 g.

To measure the G-force, we use the Analog Devices ADXL103. This is a high accuracy accelerometer, which is not really necessary for this project. The ADXL311 seems pin compatible to the ADXL103 and is cheaper. Furthermore, The board was designed such that also a Freescale accelerometer can be used (not tested).

ATtiny26 Accelerometer: [Link]

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