This is from ZachHoeken's design, requested by a few people. So we are stocking here as part of the open source PCBs. INTRODUCTION"The Danger Shield is an add-on for the Arduino micro controller board. It contains a variety of fun and useful electronic circuits that you can use to do fun and useful things. It is a fully self-contained shield. You plug it into your Arduino, and you can immediately start using it. No extra things to hook up, no external components. Just a really rad board ready to rock.What is it for? Whatever you want to do with it!"From http://www.zachhoeken.com/danger-shield-v1-0DOCUMENTSIt will be appreciated if you can help us improve the documents, add more demo code or tutorials. For technical support, please post your questions to our forum.