A design for an USB tiny ISP kit, sold by Adafruit Industries. This thing replaces the supplied black enclosure.

This board is the brains behind the Generation 3 Electronics. The heart is a Sanguino which is an Arduino-compatible board that is powered by an ATMEGA644P chip. It has connectors to hook up all the various peripherals that you'll need to drive a RepRap machine. It has headers for three stepper drivers, as well as 4 RJ45 connectors for Extruder Controller Boards. Not only that, but it has an SD card and a connector to hook it up to an ATX power supply.

Some highlights:

* Onboard atmega644p - 64K flash space, 4k ram, 32 I/O pins, Arduino compatible.
* 3 x Stepper driver connectors with min/max inputs.
* Built-in SD card socket for printing from file and buffering large print jobs.
* RS485 connection for noise-free communications with extruder / toolhead controllers.
* ATX power connector for power. It can also turn the power supply on and off.
* Headers to allow existing Sanguinos to plug straight in.
* I2C headers for simple hookup of external peripherals.
* On/Off switch for instant-kill and simple control of the entire system.

Here's a board I designed back in 2006. At the time, I was obsessed with making easy to use controller modules in the smallest packages possible. This control board should fit into a DIP44 socket.

Includes a nice LDO 5V regulator I found, and an onboard RS232 line converter. The line voltage RS232 pins and the power and ground pins are on a screw terminal header, and just about everything is brought out to the pins on the bottom. I tried to get as much IO as possible, but obviously there are some pins that didn't make it. Includes ISP header, and also has the watch crystal for RTC.

It's a pretty neat board, and it can be assembled by hand for about $20.

This is the Sanguino board. It is an Arduino compatible board based on the atmega644P. This page will tell you how to assemble one, probably from a kit that you bought somewhere. Once you are done, you'll have a sweet little board you can use for prototyping, hacking, or even for a permanent project.

The Sanguino has some awesome features like:

* 64K of flash space
* 4K of RAM
* 2K of EEPROM
* 2 hardware serial ports
* 32 GPIO pins
* 6 PWM pins
* 8 analog pins
* I2C, SPI, etc.

a system designed to record vertical acceleration during an impact and feed the data back over a standard serial connection.

using the acceleration and mass of the object software creates the impulse wave.