This project (posted on hobbydebraj) describes a simple spectrum analyzer based on a dsPIC30F4011 microcontroller. It uses Microchip’s FFT library codes to calculate the frequency spectrum of an input signal. The signal conditioning is achieved by a TL084 Op-amp IC. The peaks of spectrum are displayed on a graphics LCD.
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In this video, Carlos Asamat describes an Arduino driven speech controlled robotic vehicle. The required components and modules to construct this robot can be purchased from RobotShop. The voice commands are processed through a speech recognition hardware module and are transferred to the vehicle through Xbee RF communication modules. The speech recognition module is controlled through an Arduino Uno. The robotic vehicle to be controlled is the DFRobotShop Rover,which is a very versatile programmable robot platform. Besides the mechanical structure of the robot, the DFRobotShop Rover PCB also incorporates a standard Arduino Duemilanove (surface mount ATMega328), L293B motor driver, voltage regulator and an additional prototyping area. With the help of an additional voice recognition module, the motion of the robot can be controlled with simple spoken commands.
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This project (from Teague Labs) was intended to study the usage of water for various purposes and how this information could affect behaviors of persons using water when displayed on real time. The water meter sensor used in this project is INS-FM17N from Koolance. The sensor is directly interfaced to an Arduino that acquires and send data to a web server to make it available online.
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This project describes an automatic light system for kitchen sink where you need sufficient light to properly clean your dishes and vegetables. It uses an ATTiny84 microcontroller with a PIR motion sensor. When motion is detected, the microcontroller turns on the light. The light source consists of 10 bright white LEDs that are driven by a IRF612 MOSFET. One advantage of using a microcontroller is you can create light fade-in and fade-out effects using PWM.
Source:- http://macetech.com/blog/node/109
A music synthesizer is Frank’s entry to the 555 contest. He used a 555 timer to make a really cool synthesizer that is played with a stylus and has filtering and volume enveloping features. Various note frequencies are generated with precisely calculated resistances.
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