Blog Archives
This is among the simplest DDS-type boards which can possibly be built: Basically, it’s just an AVR RISC microcontroller connected to a DA converter.
Features:
- 8bit DA converter and fast R2R output buffer.
- Up to 2MS/s (million samples per second).
- Single 5V supply or USB-powered.
- 3 dedicated user-configurable IO ports (e.g. trigger input, sweep output, AD converter) and a diagnosis LED.
- USB connection for waveform download via USB8Bit board.
- 8kb flash and 512 bytes SRAM, freely programmable 16MHz microcontroller.
- USB-powered and externally powered operation.
[more]
This is a simple signal generator which produces sine waves (or any waveform really) at audio frequencies using DDS and is controlled a USB serial connection.Only 2 chips are used in this circuit. The AVR ATmega88 which produces the signal, and an FT232R for the USB interface. While a computer is required to control the varying frequency of the oscillator, a fixed frequency project could be made without the USB interface.[more]
The NanoVM is a java virtual machine for the Atmel AVR ATmega8 CPU, the member of the AVR CPU family used e.g. in the DLR Asuro robot, manufactured by AREXX engineering. With the NanoVM, the Asuro can be programmed in the popular Java language using the standard Sun JDK. The NanoVM and its tools are distributed under the GPL and can be used on other AVR based systems as well.[more]
The “Butterfly keyer” program converts the Butterfly demo board into an Iambic keyer which can decode and display the characters you send using the paddle. The Atmel AVR “Butterfly” is a credit card sized board which contains an AVR MEGA169 processor, a six character LCD display, a five way joystick navigation switch, a piezo speaker, a 3 volt lithium battery cell for power and a few other odds and ends.[more]
Built from a modified AVR development board manufactured by Olimex, Pass Key is a sweet little 5V โcandy barโ style computer that can generate 16-digit alphanumeric passwords as fast as you can press a button.The original AVR-MT dev board requires 10-14V, but with a little circuitry magic, this power demand can be sliced to a scant 5V without losing any of the display, buzzer, LED, button or computational capabilities of the original dev board.[more]
