One way to mill boards from a tree is with a chainsaw mill which pulls a chain saw through a large piece of wood.

The chainsaw is typically moved by hand and the user slows down and speeds up depending on how hard it is to cut the wood, which precludes attaching a constant speed drive to move the saw.

Recording the sound of the saw and analyzing its frequency content might be able to be done acoustically, and the chainsaw motion controlled  accordingly – perhaps a good E90.

 

The Arduino is a cheap electronics board that allows you to make your own electronics without a ton of coding experience. We love the Arduino, but like any electronics project, coming up with ideas for what to build is tough. Whether you’re just looking for inspiration or just need a place to start, let’s take a look at ten of the coolest Arduino projects.

Source: Top 10 Kickass Arduino Projects

Develop a low power (battery driven) wireless device/sensor.

The Bluetooth Smart SensorTag is designed to shorten the design time for Bluetooth App development from months to hours by allowing App developers to write Apps that enable and use advanced sensors directly from a smartphone without any firmware or embedded software development.

Source: Simplelink SensorTag – TI.com