Its principle is very simple. You hide it somewhere in the living room and every time someone hits a button on any IR remote control, it will play the Nokia Tune. You might expect two possible reactions: They will look where they left their mobile or ask who’s mobile is ringing.They get annoyed once they [...]

There are many DIY versions of WWVB clock designs available on the web. Commercial “atomic” clocks are inexpensive and widely available, but Bruce wanted to try he hand at designing one to gain insight into WWVB reception and to learn a little about programming a PIC microcontroller. Source: Bruce Craig

The following construction of low-frequency harmonic signal generator was necessary for debugging and measurement of audio amplifiers and other circuits, working in the audio band. The circuit is used in conjunction with low frequency (million) a voltmeter,oscilloscope or meter bias and provides an invaluable tool for checking and debugging all levels of the amplifier chain. [...]

The following construction allows a simple cable tester to determine whether the cable network is present in high-frequency signal from the source. It is a contactless version of the tester to detect the presence of a signal at distances up to 2m. It can be used to control all types of signal cables, such as [...]

Adam Mayer of NYC Resistor is working on  script for processing small pixel fonts for use in 8-bit AVR applications. The 8-bit AVRs have very little memory, so he stored each 7-pixel-high column as a single byte.  The pixel data, along with the table that maps ASCII codes to character data, comes in at around [...]

In this article Mr.Simon will show how to breadboard a simple USB generic HID device, creating the PIC18F firmware and finally creating the Windows interface for the device which will allow you to control a LED from the PC and read the state of a push-button from the device. Since the advent of Windows 7 [...]

This clock will work extremely accurate as a real time clock & also it will give you an alarm notification on every hour. This clock uses 12 hour clock format. Features: High Accurate Timing, AM/PM Indicator, Hourly Chime, Key Press Tone, Power Sense / Display Off and Battery Backup. Source: gsmicro

This project used the popular PIC16F84A microcontroller which is a program written in assembly language. GSM phone with which the device was tested by Siemens M35i (19200bps 8-N-1). The device has to work with other (older, cheap) Motorola phones such as S25, C35 (i), A65 and so on (X35, X45) … Source: Trax

LCF-meter , a inductance meter (from 10 nH to 3Gn), capacitance (from 0.1pF to 2mkF) and frequency (10 Hz to 1.1GHz). Source: picmicro

Award winner from VingPeaw Competition 2543, the robot built with 2051, L293D, and four IR sensors. Simple circuit and platform, quick tracking and easy-understand program using C language. Microcontrollor AT89C2051 and H-Bridge driver L293D were used  to control direction and speed of motor. Source: Plermjai Inchuay

This project (GSM controller ) is a device that allows you to control appliances using SMS messages. There are also 4 inputs for connecting sensors so the device will send an alarm SMS or even call you to report an alarm condition. Autor of this project has been successfully tested on: – Nokia 7110 (19200 [...]