An oscilloscope is a must have tool for any electronics enthusiast. Typically oscilloscopes are extremely expensive costing upwards of $600 meaning that price can be a real barrier to owning your own. With this fantastic project from BramMylemans you can use an Arduino to create your own oscilloscope very cheaply!
Not only is it great to be able to build your own oscilloscope, but this project will cost next to nothing as it only requires an Arduino Leonardo and a few capacitors, diodes and resistors. To get started building your own oscilloscope check out the following link.