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The Witness Camera is an automated, self-recording surveillance camera, that uses a gigabyte-class flash card as recording media.It is designed by Alberto.He design the Witnesscam because available surveillance solutions were too expensive or impractical for home use. He built the system from a VGA CMOS colour camera, a passive-infrared (PIR) movement sensor, an ATmega32 processor, and a 1GB SD-card. The prototype looks like an ordinary alarm detector. But when it detects people moving around, it silently starts recording. [via]
Witness camera - [Link]
This project used for detecting any audio signal with justable noise offset. It could be used to generate a radio mute signal eg. from a PDA.The circuit is consisting of:Input impedance ,Signal amplifier, Rectifier , Justable comparator (Noise offset). [via]
Audio Detector - [Link]
POV is a really cool concept, similar to the way a television works, an image or series of colors is spewed out and ‘blend’ together because the light pulses occur at a speed faster than our eyes can properly observe. thus like a camera with a long exposure, we see a blur and this blur can be made directly into an image of your choosing. [via]
POV - [Link]
This project is for a small electronic unit that allows the user to sense the presence and relative signal strength of wireless hotspots like a Wi-Fi detector. It can be worn as a pendant or carried in a pocket. It is “always on” and communicates the presence and signal strength of an in-range hotspot by way of sequences of pulses – like a heartbeat you can feel. The stronger and faster the “heartbeat”, the stronger the wireless signal detected. [via]
Build your own Wireless Network detector - [Link]
This project devised by two Cornell students in 2003,they wrote: For this endeavour, we first built an input stage that will amplify the input signal, as well as bias it to 2.5V (since the ADC can only sample positive signals). The ADC (MAX1111) is controlled by the microprocessor (Mega 32) using the SPI interface which was much easier than manually configuring a port to interface with the ADC(believe me, we tried that). We set the Mega 32 to sample the input at about 12 KHz which is fast enough to meet the Nyquist requirement for analog to digital sampling. The digital effects were done using by manipulating the input (which will be discussed in the Design page) and the output is passed to a R-2R DAC to a output amplifier stage and finally, to the speaker. [via]
AVR Sound Effects Processor - [Link]
This is a PIC16F877 based Timer.The outputs consist of a single 7-segment LED display and a piezo speaker . The inputs consist of a 10-position “BCD” rotary switch (for digit entry), two pushbuttons (set and start/stop), and two bits of a 8-position DIP switch (timer selection).The breadboard on the right of the photo contains the microcontroller (PIC16F877) and most of the other components of the timer; the breadboard on the left contains the serial-port adapter circuit used for programming and the DIP switch. [via]
Timer Project - [Link]
The module uses an inexpensive 8 bit Temperature Sensor the TMP37 from Analog Devices.Since the data was analog and the PIC16f84 does not have an analog input,an external ADC had to be used.Texas Instruments’ TLC549 was chosen for this.The advantage of this ADC was that it could communicate with the microcontroller serially.You may also use similar ADCs from Maxim-IC.The LCD is a normal 16×2 display which uses the Hitachi Controller HD44780. [via]
PIC16F84A temperature controller [Link]
This universal remote control tester can capture IR signals from various TV, Audio, VCR remote controls. Detector part is based on Ubicom SX28 microcontroller that can give up to 50MIPS performance.
Circuit is very simple. It used three different IR sensors to read different kinds of remote controls. Decoded data is sent to PC via RS232 port. Computer software receives and displays IR waveform in convenient form. [via]
Infrared remote control tester - [Link]
Search your hard disk to find your projects or articles and bring them to life! Submit your circuit/project or article to Electronics-Lab.com and enter the chance to win 8 great prizes.
Submit your project or article to webmaster [at] electronics-lab.com as an attachment until 25 April 2008 with your name and contact e-mail address. Files are preferred to be in a zip format and source files should be in a common file format like .doc .pdf .html etc. Subject of the e-mail must be: “Submission for Electronics-Lab.com contest”. All projects will be published under “Projects” section or “Articles” section with your name and e-mail.
You can submit more than one project/circuit to achieve more chances to win.
The winners will be selected randomly and he/she will be contacted for gift shipping details. Shipping costs are part of the prize, so you will not pay anything for receiving your gift.
A list of submitted projects will be published here
A project or article to be accepted it must:
1. Designed by you.
2. Contains clear schematic and optional photos
3. Has at least a short description
4. Be approved by moderator (you will notified if your project accepted or not)
If you have any questions, don’t hesitate to contact us at the same e-mail address.
Electronics-Lab.com Contest: Submit and WIN 8 great prizes! - [Link]
Previously we explored DC motor control using the LMD18245. Now, looking forward we’ll use a method for even better motor control using the infamous L298. Specifically the L298HN (makes things even easier), Check It Out!
L298 DC Motor Control - [Link]
