Alarm clock uses Raspberry Pi to poll Google Calendar

rpi-google-calendar-alarm-clock

We know a lot of people love using their smart phone as a bedside alarm clock. The problem is that a mobile phone is mobile by nature and eventually you’ll forget to put it in the bedroom one night. That’s why we like the solution that [Devon Bray] has chosen. He set up his Raspberry Pi as an alarm clock that is set using Google Calendar.

The setup which he shows off in his video is quite simple. The Raspberry Pi is connected to a set of powered computer speakers. It plays a song whenever an appointment called “wake” comes up on his Google Calendar. This is accomplished by using the Google Data APIs Python Client Library (isn’t that a mouthful?).

This only scratches the surface of what is possible. With this in place you could easily add LEDs to the room for a sunrise alarm. But if you’d prefer a more bare-bones hardware side of things that’s possible too.

[Read more...]

3D printing some sweet music

3d-printer-music

If you don’t mind ending up with oddly shaped 3D printed parts you can get your printer to sing to you. The exhibit shown above is doing just that. The Lulzbot is being driven specifically to produce a certain frequency of sound with its stepper motors. The results of a few different songs are what’s hanging on the wall to the right. You can hear it printing Bizet’s Carmen in the clip after the break.

[Rickard Dahlstrand] hacked together a Python script capable of parsing a MIDI file and outputting a G-code equivalent that will produce the frequencies and durations necessary to hear the audio on a stepper motor. As we mentioned, he uses a Lulzbot but the script appears to include setting for Cupcake, Thingomatic, Shapercube, and Ultimaker. The parser script as well as the example G-code files for a library of classical music can be downloaded from his repository.

Now if you’re looking for some other crazy CNC music ideas you can’t beat this wineglass music hack.

[Read more...]

Visualize Twitter with an LED matrix

visualizing-twitter

What’s your favorite color? Don’t tell us, Tweet it to [Sebastian's] favorite color Twitter display and you’ll be contributing to the artwork hanging on his wall.

This answers a very important question, what do you do with your projects after they’re completed? For us the best part is the planning and building. Once it’s done the thrill is pretty much gone for us. We haven’t even switched on our Ping Pong clock in over a year. But [Sebastian] recently dusted his 10×10 LED matrix for this project.

Tweets are parsed by a Python project he wrote to try out the Twitter API. It looks for a set list of colors . He asserts that people aren’t that creative when you solicit their favorite color but to prove him wrong we’re going to say our favorite is Amaranth. After it finds the color it pushes it to the next pixel in the spiraling pattern shown above. But wait, there’s more! To give the pixels a but if extra meaning he uses the total length of the tweet to set intensity.

If you need a Titter enabled hack that displays a bit more specific data you’ll want something that can actually display what was Tweeted.

Rigol WFM viewer ported for non-Windows users

rigol-wfm-parser-for-linux

[Matthias Blaicher] may think this isn’t a big deal when it comes to the amount of work he put into the hack. But for us, anything that extends the functionality of the versatile yet affordable Rigol DS1052E is a win. In this case he’s taken a previous hack and made it work for more people by extending the functionality of the WFM file format viewer.

[Dexter2048] pulled off the original hack which allows this oscilloscope to be used as a spectrum analyzer. [Matthias] didn’t want the tool to be limited to running only on Windows systems so he got to work. This isn’t quite as easy as sounds because the only part of the original code that was released is the parser itself. [Matthias] had to build everything up from that starting point. His software uses standard Python to parse the WFM file and reformat the data. The features included in the current version allow you to export data as a CSV file and even plot the waveform and FFT as seen above.

Python script migrates from dying Google Reader to Evernote

google-reader-to-evernote

We’re sure you’ve heard by now that Google has decided to close its RSS feed aggregator service called Google Reader. We’ve got to remember to get our list of thousands of great hacking blog feeds off of there before it’s gone. But just preserving the list is rather easy. [Paul Kerchen] has a bit different problem. He’s got hundreds of articles starred and he wants to preserve a way to find those pages again. His solution was to write his own Python script to migrate starred Google Reader articles over to Evernote.

We’re not here to promote the Evernote service. But just so we’re on the same page, it’s an archiving system that lets you save things like webpages and text documents for access on a wide range of different platforms. So all that really needs to happen is for [Paul] to get the list of links from his starred articles folder formatted for import on Evernote. It starts by using Google Takeout to download an archive of his account data. Within this dump is a JSON formatted file called ‘starred.json’. His script parses the data and imports each article into Evernote. There’s even rate limiting to manage the daily import maximum of free accounts.

Wiimote Controlled RPi Robot

Wiimote RPi Robot

[Brian] has brought together a powerful collection of hardware to build a robot. The end goal is to have a robot that’s controlled by a Wiimote.

The Wiimote communicates over Bluetooth with a Raspberry Pi, which is running a Python script. This script uses the CWiid Python module to communicate with the controller, and [Brian] has detailed instructions on getting the Wiimote working with a RPi. The RPi controls an ATmega based development board over SPI, which drives an h-bridge to control the two DC motors that move the robot.

[Brian]‘s code for this could be helpful for anyone looking to control their RPi with a Wiimote. Since Wiimotes and Bluetooth dongles are fairly cheap nowadays, this is a great way to drop in wireless control to any RPi project, or even to control your media center from the couch.

After the break, check out a video of the build in action

[Read more...]

Optical data transfer project at local school’s family science night

optical-data-at-family-science-night

[Dave] wanted to show off a project at his 4th-grade son’s school during their family science night. We haven’t heard of an event like this before but it sounds like a fabulous idea! He had a new laser he wanted to include in the project, and noticed that his son was learning about how ASCII maps letters to binary number when the idea struck. He ended up building an optical data transfer system that demonstrates binary code.

This presents a fantastic learning opportunity as the project invited the school kids to select encoded strips like the ones seen above to form a secret message. The laser is pointed at a photosensor which is being read by a Raspberry Pi board. The Python code looks for a baseline and then records increases and decreases in intensity. Since the translucent tokens have either holes or black lines for 0 and 1 the baseline approach does away with the need to clock in the data. [Dave] reports that everyone who tried out the experiment was fully engaged at the prospect of pushing pieces of tape through the sensor and watching their secret message appear on a monitor.

He was motivated to write about this project after reading about data transfer using an LCD screen and photosensor.

Follow

Get every new post delivered to your Inbox.

Join 94,598 other followers