The title says it all - this article describes a microcontroller-compatible current sensor module you can build yourself, using an inexpensive 8-pin chip

Usbpicprog - a free and open source usb pic programmer

Here we measure rainfall. Find this and other hardware projects on Hackster.io.

A popular hybrid amp design available for headphone use, this single-ended (SE) pure Class-A amplifier is capable of driving headphones between 32 and 600Ω

EWaste 60$ 3DPrinter: This project describes the design of a very low budget 3D Printer that is mainly built out of recycled electronic components. The result is a small format printer for less than 100$. First of all, we learn how a generic CNC system works (by assembl…

Crazy Engineer’s Drawing Robot is an Arduino, Customised GRBL, CoreXY, Servo and Stepper based CNC Drawbot that is Open Source and Open Hardware. It can draw or write using anything on anything.