mekonik has published complete details on his Arduino magnetic levitation project. Not content to settle for a typical “hello world” LED blinker as his first project, he supplemented the Arduino with an electromagnet, Honeywell SS19 Hall effect sensor, MC3401P op amp, NPN transistor and 1N4001 rectifier. The circuit essentially uses the small Hall effect sensor to sense the field of the permanent magnet and uses that information calculated by the Arduino to control the modulation of the magnetic field of the electromagnet. Pretty cool!
Arduino magnetic levitation project - [Link]
It’s true – I love DACs. There’s something awesome about the role they play, translating information from one paradigm over to another form. Sure, you can pick up a precision DAC chip with serial interface for a little over a buck, but building a barebones version from a handful of resistors is a pretty dang sweet trick. If you’ve never built one, I do recommend it. Doing so has a way of demystifying all sorts of related circuits and processes.
Collin’s Lab: Digital to Analog Converter – [Link]
Andrew O’Malley’s writes:
DOTKLOK is an open-source, hackable, Arduino-based digital clock that displays a series of unique time-telling animations. The passing of time is depicted with numbers and abstract/geometric patterns such as Morse code and minimal analog clock faces, and includes animations inspired by classic video games such as Pong, Tetris, Pacman, and Space Invaders.
Arduino-Based Digital Clock – [Link]
This instructable will show you how to make an electronic dice with minimal experience using 7 LEDs, resistors, jumper wires, and of course the arduino (or arduino clone). I wrote this instructable for anyone to easily follow along and learn more about the arduino. Questions are welcome and will be answered as soon as possible. For less experienced users the code for the arduino is in “longhand” and several comments are included for better understanding of the code being uploaded into the arduino.
Arduino electronic dice (using random numbers) – [Link]
Feb. 14, 1989: GPS Enters Orbit | This Day In Tech | Wired.com…
The first of 24 satellites that will make up the global positioning system is put into orbit.
GPS revolutionized navigation, both at sea and on land, by providing position reports with unprecedented, pinpoint accuracy. Each satellite is placed in a specific orbit at a specific altitude to ensure that four or five satellites are always within range from any point on the planet. A GPS receiver picks up signals from the satellites and trilaterates the data to fix the position.
Feb. 14, 1989: GPS Enters Orbit – [Link]
Agilent 2000 X Series Infiniivision Oscilloscope Teardown – [Link]
Reverse Engineering is an important skill for electronics hobbyists because very often you will run into something you want to use, but don’t know how. An LCD is a tough thing to reverse engineer, but this tutorial shows you one approach to figuring out how to get things working. [via]
Reverse Engineering an LCD Display – [Link]
Named ‘El Relojito’ (relojo = watch in spanish), this seemingly simple design is a great project for anyone ready to move past the rank of ‘amateur’. 60 LEDs surround the 7-segment leds telling you the time. A PIC micro controls all the action. The write-up is in spanish, but the schematic/pictures should be enough to guide you. [via]
Simple LED Clock PCB Design - [Link]