The easiest way for people who have used an Arduino and Raspberry-Pi and wish to take their projects further is to use a Dock. In Arduino terms, a Dock is a type of Shield, that sits on the processor board to provide some type of function. For clixx.io, the function is to map the I-O pins into the clixx.io arrangement that makes them more useable.
clixx.io provides Docks for several different popular platforms. So that you can plug in embedded peripherals straight into the processor and start working.
The Raspberry-Pi is a lot more advanced than the Arduino in terms of it's processing power. It even runs Linux. We have a Dock for this as well that allows you to use the exact same peripherals from the Arduino on your Raspberry-Pi.
It's still an ideal platform for clixx.io and the Raspberry-Pi allows you to run the full MQTT stack and start working with IoT in a fun and interesting way.
Using the Docks
The Docks contain all the commonly used functions such as Analog/Digital/Serial/I2C/SPI conveniently broken out to 5-Pin connectors.
All you have to do is plug in the Tabs into the appropriate connector and start using the software to get your project up and running.