Circuit Lake

This project show you how to build Unipolar Stepper Motor driver for high current. The driver able to handle up to 20A. The main component in this driver is L297. While the driver circuit is more or less taken from the L297 datasheet. More features from the project are : Handles a maximum of 100V, Handles a maximum of 20A, Half-step and full-step, Shuts down on overtemperature, and PMinMO-compatible interface. The project designed by Dalton. 20A Stepper Driver Project Documentation and Schematic dalton.ax

If you like LED display project here is another cool project : Arduino based POV globe. This persistence of vision project able to displaying monocolour bitmaps up to 72 pixels high and x width. (uses 72 LEDs, and one input to get rotation speed). The main component in this project is atmega328P, 72 SMD LED, Reed switch (sensor) and power supply. Arduino byte array for images are generated using the c# program. Image displayed is synch'd to speed of motor using a reed switch, this allows image to display around hole ...

This project enables you to drive two unipolar stepper motor or eight electric light bulb or DC motors. There are eight DC power switch you can open or close through PC parallel port. For safety reason, digital interface to PC uses optocouplers. You can connect up to six circuits to a single LPT, driving up to twelve step motors or 48 bulb The range of circuit power supply should be from 14 to 50V. Circuit can handle 10 A maximum for all switch but if you use IRF540 then the max ...

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 component in a radio receiver. Finally, the 'normal' GPS information (time, location, velocity, etc.) can also be displayed. This project uses 2 UART's, all of the 5 timers, 2 PWM outputs, and an external interrupt. ...

This is 3 in 1 digital data logger project. You can take several measurements: Temperature, Humidity, and Barometric pressure measurements. The project use AVR ATmega8 as main processor. While humidity and temperature are sense by Sensirion SHT75 and the barometer use Intersema MS5534. Those two components talk their own language which is similar to other Serial synchronous protocol (or SPI). Sylvain Bissonnette said that all measurements have their own dedicated A/D converter in each sensor. This digital environment sensor No Need any calibration. Besides 3 measurement function and no Calibration, this ...

The goal of this project is to simulate the 26 Braille codes by vibrating a motor mounted on the glove’s finger tips. When the tips tapped out a Braille code, the information is stored in SRAM, or in EEPROM; or sent as ASCII data wirelessly to other compatible Braille gloves. The system features two gloves that communicate wirelessly. The main board includes a dsPIC33FJ256MC510 microcontroller, which controls four vibration motors, four accelerometers, and a 32-KB SPI serial EEPROM 25LC256. This system provides a unique method for someone to both read and ...

This is simple but very powerful USB charger project for your gadget like mp3 player, camera, cell phone, and any other gadget you can plug into a USB port to charge. Main component of the project is LT1302, Micropower High Output Current Step-Up Adjustable and Fixed 5V DC/DC Converters from Linear. The charger circuitry and 2 AA batteries fit into an Altoids gum tin, and will run your iPod for hours, 2.5x more than you'd get from a 9V USB charger. You can use rechargeable batteries too. I think this powerful ...