DIY breadboard modules for rapid prototyping

Raj made a few breadboard modules to speed up prototyping. We think it’s a great idea to have a power supply, few switches, LEDs, etc, broken out into modules. It will save you a ton of time, and space on your breadboard. Breadboards are a great tool for prototyping and testing electronics circuits. However, if […]

Defcon 19: build your own radar system

At the Defcon 19 (2011) conference Michael Scarito demonstrated how to construct your own radar system. The project is based on a design by Dr. Greg Charvat from MIT and uses synthetic aperture techniques to generate a two- or three-dimensional image. (You can read Dr. Charvat’s research paper here.) The hardware operates in the 2.4 […]

LiPo auto-balancing circuit

ScottD tipped us to the LiPo Auto Balancer circuit featured in the Elektor magazine’s June 2010 issue. When using multiple lithium ion/polymer batteries in series an auto-balancing circuit is needed to make sure all the cells charge equally. Due to slight differences in capacity, some cells will reach full charge before others. This effect increases […]

FPGACheap DIY Altera FPGA USB programmer

This is a DIY USB programer for Altera FPGAs. It only uses a PIC uC and a few discrete components to provide a JTAG interface with a FPGA. Somun found it on a Japanese site (machine translation), and with the help of Google Translate he built one for himself. There are two versions available. The […]

Fingertip heart rate monitor

R-B built a heart rate measurement from fingertip circuit. He also provided all the design files, and general theory of it’s operation: This project describes a microcontroller based heart rate measuement system that uses optical sensors to measure the alteration in blood volume at fingertip with each heart beat. The sensor unit consists of an […]

E-book reader for the microtouch

Rossum built an e-book reader for the microtouch. He wanted to use the common e-book format epub. But unfortunately since the format is actually a compressed set of text, html links and images, it was too much for the 8-bit microcontroller to handle. To overcome this he developed a transcoding tool (epubgrider) to decompress the […]

Controllable aquarium moonlight strip

Theatrus build a controllable aquarium moonlight strip. Royal-blue Osram high power surface mount LEDs provide the lighting, and an ATmega88 the control. RS485 port is used for control. All of the design files should be available shortly. Its quite potent (visible with the main 6x80W T5s running). Its easy to mount (a handful of command strips […]