Resources

Here are some things we've found useful along the way. Your mileage may vary!

 

Component sources and tutorials to help you start building actual things:

Sparkfun

RS Components (also see their Design Spark community)

Adafruit

 

Miscellaneous:

Pulse sensor tutorials

Arduino hole layout for making cases

Stack Exchange : questions and answers to pretty much anything. Be polite and search to see if your question has already been answered before you ask it.