Fresh hacks every day
The next time you're unfortunate enough to make your way to a hospital, emergency room, or urgent care clinic, you'll be asked to attach a small pulse monitor to your finger. The device the nurses clip on to one of your remaining digits is called a photoplethysmographic sensor, and basically it is able to read your pulse through reflected light. In the search to find out how these devices … [Read more...]
Up next on the continual march of expansion boards for the Raspberry Pi is the Raspy Juice, a board designed to break out the GPIO pins on the Raspberry Pi into servo, serial, and other miscellaneous connections. The Raspy Juice features an ATMega168A microcontroller connected to the Raspberry Pi as an I2C slave device. Not only does the addition of a microcontroller add analog inputs to the … [Read more...]
Coil guns use electromagnetic coils to propel a metal projectile. On the surface they may look rather complicated. But when you break down the concepts it's pretty easy to learn. If you've ever thought of dabbling in this field this lengthy coilgun primer will be a great help. The basic concept of a coilgun comes in three parts: the coil, the voltage source, and the switch that combines the two. … [Read more...]
[Sam] picked up a Sansa Clip audio player to listen to some tunes while working on projects. He liked the fact that he could run the Rockbox alternative firmware on the device, but thought the 15 hour battery life needed some improving. He swapped out the stock cell with a larger Lithium cell for a long life of 50-60 hours. It's an upgrade fom 300 mAh to 1100 mAh, but as you can see, the size of … [Read more...]
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