This is a simple dual H-Bridge drive I made some time ago using some chips I got off eBay. It uses a Pic micro-controller to handle the step direction inputs to coil drive logic. I used the cheapest pics I had around which were the 12c50/509's. There is no enable input but that could be added by using a larger pin count PIC. Check out the completed Arduino 3 axis mill here: http://www.instructables.com/id/3-Axis-Arduino-Based-CNC-Controller/
The 8 Cheapest Computers in the World highlight on the Raspberry Pi with a custom case.
Memtype project is a low-cost and open source solution to store your passwords for having them available everywhere in a tiny and portable USB form factor device. The device is based on the Atmel attiny85 device and uses V-USB software solution to have USB communications and enumerate as a keyboard. The project started with the idea... what's the cheapest way of having a USB stick with all your passwords ? About security... the device can't be accessed without entering a ...
When do you need a Logic Level Converter? Most sensors designed for the Arduino Uno operate on a 5V supply. However, some sensors are designed to operate at less than 5V and you will need a Logic Level Converter. BMP280 Barometric Pressure Sensor The Bosch BMP280 barometric pressure sensor will be discontinued by the manufacturer and that makes it the cheapest barometric ... [Read more...]
Every few years, cockroaches find themselves conscripted into humanity’s ongoing endeavours to build proper cyborgs. And this example from Instructables may be the cheapest venture yet. A user calling themselves bravoechonovember1 recently released guidelines on how to control a roach with an Arduino