"How to build a micro wind turbine" is a practical manual full of pictures, plans, tables and comments to learn how to build a 100W wind turbine and 6 metre tower from scratch, for less than 250 USD. The design is based on very reliable, efficient and easy to build Piggott's turbines. This micro turbine with five blades is appropriated to power a boat, a shelter, a RV or an household in a developing country. A design to build a simple and low cost wind controller is included. The book "A wind turbine recipe book" from Hugh Piggott is strongly recommanded as a complement to this manual. The units are international metrics.