AT90S2313 Based Frequency Counter

Jesper writes: This is another project which fullfills a need. I once built a frequency counter using plain TTL chips. That was long before the CMOS HC versions, even before LS was available. It could measure up to 50 MHz and worked quite okay, but the TTL chips was extremely power hungry. I think there was about 20-25 TTL chips on that monster. Well, but the old counter is now somewhere in the shed, and as I now again needed a counter, I did a bit more modern design.

It uses only 4 chips – 3 HC TTL’s and an Atmel At90S2313 microcontroller. It has a 5 digit LED display plus one used as a band indicator. Even with the LED display, the current consumption is less than 50 mA. It counts up to at least 52 MHz. I couldn’t find any signal source in the lab that could supply more than 52 MHz, so it may go a bit higher, but the fClock(typ) for the HC590 is about 35-40 MHz, so you shouldn’t really count (no pun intended) on more.

AT90S2313 Based Frequency Counter: [Link]

Squarecave: DIY analog/digital synthesizer

The Squarecave is a hybrid digital and analog music synthesizer. It uses digital CMOS ICs to generate a sequence of oscillations of varying pitch and volume, and then pipes the result through analog filters (lo-pass, hi-pass, band-pass).

Squarecave: DIY analog/digital synthesizer: [Link]

 The world’s first ultra-thin 8.5mm camera module by Samsung

Measuring just 8.5-mm thin, you’re looking at what Samsung claims to be the slimmest CMOS camera module of its kind. The 8 megapixel module is expected to supplant the 5 megapixel job found in todays top-end cameraphones sometime in the second half of the year. Fortunately, this isn’t just a case of megapixel marketing as the module also features anti-shake, a 1-cm macro, and face tracking technology. It also packs a smile shutter feature to snap that picture just as soon as a smile, or vinegar, is detected.

The world’s first ultra-thin 8.5mm camera module by Samsung: [Via]

Self-recording surveillance camera project picture

The WITNESSCAM is a self-recording surveillance camera that’s perfect for the home or office. The innovative, ATmega32-based system features a VGA CMOS color camera, a passive-infrared (PIR) movement sensor, and a 1-GB SD card. The aesthetically pleasing prototype looks like an ordinary alarm detector, but when it detects movement, it silently starts recording. You can control the camera an infrared remote. The interactive camera responds with voice prompts, and the circuit can recognize when the box is open.

Self-recording surveillance camera:[Download project][View project info pdf]

Digital Camera Interface Project circuit

The aim of the following project is the construction and development of an interface between a CMOS camera and a computer. The interface will allow a use to get images from the camera and to change the properties of the camera as brightness, luminance, etc. from the computer. Also some image tracking technology is implemented allowing the camera to track white objects and follow them with a servomotor.

Digital Camera Interface Project camera
The interface is based on the Atmel AVR ATmega16 microcontroller. The Camera called c3088 uses a CMOS image sensor OV6620 from  Omnivision . It has a digital video port that supplies a continuous 8/16 bit image data stream. All the camera functions, such as exposure, gamma, gain, white balance, windowing, can be changed through I2C interface by writing in some registers.

The communication from the microcontroller to the camera to change the properties of the camera is made using the I2C. The images from the camera are read following the Zoom Video Port Format implemented by the camera. The images read are in black and white because only the Y channel is read. To control all this communications the microcontroller is connected to the computer via serial port. The microcontroller read commands from the computer and perform the appropriate actions. The serial port is also used to receive the images in BMP format. If you would like to start building this project, head to authors page for full info.


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