Breakouts / Shields

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http://www.sparkfun.com/products/9716

FTDI Basic Breakout - 5V - SparkFun Electronics

Description: This is the newest revision of our FTDI Basic . We now use a SMD 6-pin header on the bottom, which makes it smaller and more compact. Functionality has remained the same. This is a basic breakout board for the FTDI FT232RL USB to serial IC. The pinout of this board matches the FTDI cable to work with official Arduino and cloned 5V Arduino boards. It can also be used for general serial applications.
Description: The FTDI cable is a USB to Serial (TTL level) converter which allows for a simple way to connect TTL interface devices to USB. The I/O pins of this FTDI cable are configured to operate at 5V. The FTDI cable is designed around an FT232RQ, which is housed in a USB A connector. The other side of the cable is terminated with a 0.1" pitch, 6-pin connector with the following pinout: RTS, RX, TX, 5V, CTS, GND (RTS is the green cable and GND is black). This cable has the same pinout and functionality as our FTDI Basic Breakout board; you can use it to program your Arduino Pro , Pro Mini and Lilypad . http://www.sparkfun.com/products/9718

FTDI Cable 5V - SparkFun Electronics

BlueSmirf

WiFly GSX Breakout

Adding quality audio to an electronic project is surprisingly difficult. People tend to end up either using low-quality ISD chips (you might get 8Khz sampling rate for 30seconds out of these, if you're lucky!) or mucking around with trying to control a CD or MP3 player. Although it's possible to generate audio direct from a microcontroller using a PWM output , the quality is often low and its hard to fit a lot of music in an EEPROM chip. http://www.ladyada.net/make/waveshield/index.html

Audio Shield for Arduino