There is a huge community of people using Arduinos and Arduino-compatible boards to create their own inventions, and they tend to share all the instructions needed to recreate their ideas, and take them further, repurpose them or remix them.
We aim for Makers using our Shrimp stripboard or breadboard design to be able to replicate any Arduino project with the minimum of effort, using the ATMEGA328 pinmapping to figure out how to translate from Arduino pin numbers in code or schematics.
To get started, you could work through one or more of the introductory Arduino examples, which provide simple experiments with detailed diagrams, instructions and example code.
Most of the components to replicate these will be available on hand at any free Shrimping workshop.
If you are already comfortable with code, you could explore the Arduino language reference .
Thousands upon thousands of projects are documented out there, for free, from playful games, gadgets, toys, pranks, right the way through to really serious science stuff like space exploration or atom smashing. Here’s a few places you might go to be inspired, or to find projects which will help you build something you’ve already got in mind.
Instructables’ Arduino Channel (real world projects, with user-submitted instructions)
Hackaday Arduino Hacks (inspiring stuff, but not always easy to copy without help)
Make Arduino Projects (Makezine is a great source of hacks of all kinds, including electronics)
For more specific, detailed questions, such as how to use particular sensor inputs or control various devices and components, you could try…
…or just register at the Arduino forum.