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"How to make your very own Hydraulic Arm! This project focuses on the principles of hydraulic movements. To do that we made a small scale demonstration of a Robotic Hydraulic Arm. We managed to do some pretty cool tasks with our ''Arm'', do check out the video down below for a better understanding! This project is entirely made with cardboard and a couple of syringes, all the plans and blueprints are available."

"In this Instructable, I'm going to be showing you how to build your own crack the code game in which you use a rotary encoder dial to guess the randomly generated code to the safe. There are 8 LEDs on the front of the safe to tell you how many of the digits you've guessed are correct and how many are in the right place as well. The safe is initially open, allowing you to put something into the inside compartment. The Arduino and battery are housed in a separate compartment in the back. You then push the dial to lock the safe, which is done using a servo on the inside of the door. You then need to input the code by turning the dial to select the digits and pushing the dial to confirm each digit. After your fourth digit is chosen, the safe displays how many of your digits are correct and how many of them are in the correct place using the red and green LEDs on the door. "

"This is a simple tool that uses some basic trigonometry to measure the height of trees. This tool is a 45-45-90 triangle and thus an isosceles triangle. Isosceles triangles have two legs of equal length. By using a 45-45-90 triangle to placed yourself at a distance from a tree trunk, you create an triangle where the distance from the trunk is also the height of the tree. "