Are there any expansion boards available for the GPIO?

Question

Are there any expansion boards available for the Raspberry Pi for use with the GPIO?

Answer 1

Adafruit has unidirectional and bidirectional Logic Level Converters among other goodies for the RasPi.

BitWizard B.V. also carries a range of I2C expansion boards and accessories,

Just came across this one on youtube available here for order(preorder)

RaspberryPI has also discussed the Gertboard, but I have yet to see pricing and availability details.

Answer 2

The Pi-Face looks like a great expansion board.

From the website:

• Allows you to control lights, motors etc and monitor digital inputs, switches, etc.
• Four switches and four LEDs on board for rapid prototyping
• Two onboard relays (10A) for easy control
• Buffered to protect the Raspberry Pi; high-current open collector outputs and schmit trigger buffer inputs
• Credit card size, stacks on top of Raspberry Pi
• Easy to connect with screw terminals
• Easy to program with C and Python libraries

From the looks of things this will allow you to take input from a myriad of sensors, and easily allow you to interface your Pi with external components like switches, relays, lights etc

Answer 3

Seeed Studio has Grove Base Hat for Raspberry Pi which provides GPIO connectors.