Circuit Lake

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This portable 2.4 GHz Spectrum Analyzer is built inside a cell phone case, Nokia 3410, and used the phone’s graphical LCD to display measuring results. It uses AVR ATMega8 as main controller and CYWM6935 module. The software is written in C using arv-gcc under Windows (WinAVR). The program runs continuously and make around six [...]

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This AVR-based wireless pedometer can provide useful statistics for walker/runner such as the number of steps a user has taken, the distance and the speed the person has walked/run, as well as the number of calories the person has burned. This information is wirelessly transmitted to the base-station, and it is displayed on the [...]

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The PRO-I/O breadboard development system emulates various input and output devices typically used in today’s designs. It plugged into a breadboard along its top row of connectors and provided input stimulus and output display for the circuit under development. The project include switches, pushbuttons, a 2×16 character LCD display, LEDs and even a small [...]

The Expandable Serial Port Multiplexer project allows a single RS232 serial port to service multiple instruments requiring RS232 ports. Each port is configurable in terms of baud rate, parity, number of bits and number of stop. On the host side the serial streams could be multiplexed through the use of a Windows driver or [...]

This project will show you how to build single digital controller to drive 32 channel R/C servo. The main component in this project is AVR ATmega8515L and Xilinx Spartan IIE FPGA. The combination between FPGA and an ATmega8515L microcontroller make this project powerful solution for robotics applications, especially multi-legged walking robot project.

The project used interesting approach for reducing speaker distortion and increasing bass response. A dual coil speaker driver is used but only one of the coils is connected to the power amplifier – the other is used for electromotive feedback. This method is not new, but is difficult to implement in pure analogue world because [...]

In this project a 16-bit PIC is used to build an accurate frequency reference synchronized to a GPS clock. This device can serve as an accurate frequency counter that can count to 50 MHz with 1 Hz accuracy. It can also be used to generate GPS-locked output signals as a frequency reference or as a [...]