Hackaday

One of the more interesting use cases for the Raspberry Pi is exploiting its DSP capabilities in interesting ways.

Here’s a sunrise alarm clock that keeps perfect time. It was designed and built by [Renaud Schleck] who also published a post detailing the process.

It’s the end of the semester for [Bruce Land]‘s microcontroller design class at Cornell, and the projects coming off the workbench this semester look as awesome as any before.

Here’s a project that let [Rick Pannen] try his hand with an OLED display and a rechargeable power source. He calls it OLEDuino which is a mashup of the display type and the Arduino compatible chip running the whole thing.

[Linkin] decided to give the whole embedded business card thing a try. Here is his finished project, a low-profile mass storage business card that doesn’t cost an arm and a leg.

Like many of us, [Jon] began his journey through the magical world of microcontrollers with an Arduino. For a beginner, the Arduino is a wonderful tool, but [Jon] quickly found himself limited by the platform.

Here’s another offering when it comes to PIC programming from the Raspberry Pi.

We’ve got something of a love affair going on with quadcopters, but there’s still room for a little something on the side. This fixed-wing drone can pull off some pretty amazing navigation.

[Derek] wanted a clock for his media center. A simple wish, but he had a few requirements: he didn’t need an alarm, wanted it to automatically set its time after a power outage, needed a big display, and also wanted it to look good.

This project may take the cake on high-end reflow retrofits. It’s a HUGE project which uses a toaster oven to reflow surface mount circuit boards. And the fact that it bursts with features makes us giddy.

[Remy] has access to a very nice Fluke thermal camera, so when his Raspberry pi came in he pointed the thermal camera at the Raspi (Spanish, Google translation) to see how far this neat computer could be pushed before it overheated.

[Doragasu] got his hands on one of these WM8650 Netbooks for around 50 euros (~$63.50) delivered. They come with a version of Android preinstalled, but he wanted to use them more like a computer and less like an Android device.

Wow, we’re seeing all kinds of good stuff from NYC Resistor today. [Caleb] found this link to [Hudson's] early work on a geeky wristwatch. It is based around an HDSP-2112 eight-digit alpha-numeric display.

[Jack Crossfire] took one of those inexpensive indoor helicopters and made it autonomous. He didn’t replace the hardware used for the helicopter, but augmented it and patched into the remote control to make a base station.

[Ladyada] and [pt] had an old keyboard from NeXT, but since it used a custom protocol it wasn’t usable with modern hardware. So they built a custom device to convert the NeXT protocol to USB.

This soldering nightmare is a configurable RFID tag which has been built from 7400-series logic chips. The beast of a project results in an iPhone-sized module which can be used as your new access card for security systems that uses the 125 kHz tags.

What you see here is a Raspberry Pi shoehorned into a power strip. The idea is to leverage the power and low-cost of this board into a stealthy network observation device. It packs a similar punch as the Power Pwn but should cost at least $1100 less!

Many have tried to put together an easy package for running software defined radio packages on the Mac. Not many have succeeded the way [Elias]‘ port of the gqrx SDR package has.

Aside from wanting to play around with nitric acid, [Ben] really didn’t have a reason to decap a few 74xx and 4000-series logic chips. Not that we mind, as he provides a great tutorial at looking at a bare IC that isn’t covered in epoxy and resin.

[Andy] has been hard at work reverse-engineering the Nokia N82 2.4 inch cell phone display for use with an Arduino.

When [Matt] started building his multirotor helicopter, he was far too involved with building his craft than worrying about small details like how to actually control his helicopter.

The lion’s share of soil moisture monitors we see are meant as add-ons for a microcontroller.

[GuShH] wrote a guide for making your own rosin-based solder flux. According to [Stephen] — who sent in the tip and tried this method himself — is works well, it’s cheap, but you will need to clean up a bit after using it on a PCB.