Circuit Lake

The IOSTRING is a modular physical user interface system which consists of a series of three basic board modules designed around the Atmel AVR AtMega88 MCU. Each module type can handle switches, pushbuttons, rotary selector switches, rotary shaft encoders, potentiometers, LED’s, LCD displays, and an alphanumeric LED display. Dual footprints are provided on each board to accommodate a large variety of combinations and device types. Designers simply assemble IOSTRING modules together in a daisy-chain configuration to form an arbitrarily complex user interface panel. The best part of it is that the ...

This stand-alone internet wireless music player, named as Wireless MP3 (WMP3), uses Atmel AVR AT90CAN128 microcontroller as main 'brain'. The device can play music from internet radio stations like Shoutcast (www.shoutcast.com), connect to shared network drives and play mp3 files. Ubiquitous 802.11b wireless link is used to connect to the internet. "WMP3 uses HTTP protocol to search online servers. Once the location of the radio station is identified, WMP3 directly connects to the server and start playing the streamed data. Another important feature in WMP3 is its ability to list networked ...

The purpose of the high altitude rocket telemetry payload was to design and develop a flexible flight computer to be flown onboard reusable mid and high powered model rockets. Since these designs are to be flown on relatively small rockets, size and weight were of paramount importance to the payload developed. At the same time, it also needed to be flexible as the system would need to evolve as the rockets it flew aboard became larger and more complex. The system consists of a main computer board based around the ATMEL ...

This Logic Analyzer project allow you to monitors and captures a number of digital signals. It uses PC to display the data processing. The system consists of ATmega88-20PU AVR microcontroller as main processor and some simple components used for the interfacing with the PC, the man and the probes. The measuring instrument supports 8 input lines and a limited amount of memory (only 1 Kbyte). The basic sampling rate (normal mode) is 2 M samples/sec. At this rate the logic analyzer can store at least 512 samples and supports up to ...

This battery charger built using IC MAX713, a NiCad battery charger IC from Maxim. It will control the fast charge time and monitor the cell voltage. The project can charges a battery approximately 80% charge in 22 minutes at a current of 2.4 Amps. Once the fast charging has ended, it trickle charges the battery. click for large pic The power supply comes from a 13.6V, 3 Amp, switch mode power supply. There is also provision to use power from a 12V accessory (cigarette lighter) socket. But, to avoid the fast charge ...

This PIC18F1320-based mood lamp project contains of 3 Luxeon Star LED lights, red, green and blue. Each light uses around 1 Watt maximum. It typically consumes 40-60 times less electricity than a standard incandescent light bulb, It's very efficient in energy use. By turning the LEDs on and off at high speeds the chip can control the brightness of each LED individually (this type of accurately timed control is called PWM or Pulse-Width Modulation). BD139 NPN power transistors are used to sink the current from the LEDs. To allow the PIC ...

This PIC16F876A-based accu cycler project allow you to charge and discharge NiCd and NiMH accumulators for R/C modelers and others. It has performance close to commercial products in the market. The 'intelligent' part of the system can communicates with PC using serial port providing additional process visualization. The process graph is saved to on-board EEPROM memory and it is possible to download the data to PC even when the charging/discharging process has finished. The charger also utilize with LCD 16x2 for quick display. The PIC 16F876A firmware use Basic source ...