Circuit Lake

If you want to build a RPM meter project based on Microcontroller AVR? Check out this RPM Meter with rotational speed sensor KMI15/1. For this project, Tomi use AT90S2313 to store the program and control the sensor. As compiler he used Bascom AVR. Read more AVR RPM Meter with KMI15/1 Rotational Speed Sensor

Checkpoint Charlie is a security system that features an effective access control terminal based on LPC2138 microcontroller. The project uses Java Card smart card for user-authentication program and performs a challenge-response scheme using a symmetric cryptographic algorithm for optimum reliability. Activity at the terminal is logged and can be transmitted remotely via an RS-232 interface. The system is favorable to using ID cards with magnetic stripes, which are easier to counterfeit than a smart card. Read more LPC2138 Security System

The project goal is to detect water flow and drive ambient LED display. This project use piezo transducer as sensor, Some LEDS for display and Arduino as main controller. The device is a rough prototype of what will eventually become a persuasive technology that motivates sustainable behavior and raises awareness about water use, say Stacey Kuznetsov, the designer. Read more Arduino Low Cost Water Flow Sensor

The purpose of this project is to show spectrum of a sound signal from computer through a serial port to light-emitting diode matrix which is controller by microcontroller.

The Dot Matrix Spectrum Analyzer project use microcontroller AVR AT90S2313 as main part, you can change the micro with ATTINY2313. The controllers accepts the data from a serial port and with the help of conclusions of port B and the additional decoder 74145 is deduce a spectrum on the light-emitting diode screen are collected from two matrixes. Read more AVR Dot Matrix Spectrum Analyzer

This USB interface board project is used to connect 8 (parallel) data lines to the USB. Main component of this project is FT245BM. With a small internal FIFO (384 byte Tx, 128 bytes Rx) and 4 handshake lines which make it suitable for interfacing microcontroller designs to the USB. Wolfgang says that you can also use it as simple 8bit IO when the bitbang mode is enabled. But in this mode, the bits will not come out in a constant bitrate but in chunks of 64 bytes with specified baud rate followed by a delay. Read more USB 8 Bit Interface Board

This is simple low-cost logic analyzer. The PIC18F252 board has function as capture device and display the result to PC. In Normal mode the max sample rate is 2 microseconds although the sustained rate is limited to 170 microseconds/event (RS232) of 40 microseconds/event (USB). In Fast mode the max sample rate is 200 nanoseconds, 4bit sampling is supported at 500nsec and lower rates. Read more PIC 18F252 Logic Analyzer