The free bonus chapter I have available for download shows people how to build a basic RFID based access control system for your front door. In it, I detail how to take a PowerBolt electronic pin code deadbolt and add RFID as an alternative authentication method. Well the people that make the PowerBolt electronic deadbolt changed the design of the internal circuit board, and now the chapter needs to be updated. But, I’m pretty busy and travelling all over the place right now, so in the mean time I’m just going to post this link to a forum comment that sums up the solution.
http://www.rfidtoys.net/forum/forum_posts.asp?TID=566&PN=1&TPN=1