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Showing posts from October, 2012

Using Audacity as an Oscilloscope

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A good oscilloscope is hard to afford. Spending money on a mediocre one doesn't seem to justify the stiff cost of even low-end scopes. In the meantime, I found a workaround! :-) Why did I need an oscilloscope? I've been wanting to crack my truck's keyless entry transponder code for a while now. I finally got around to it and succeeded with the help of a $5 315 MHz wireless receiver module from sparkfun.com, an old headphone cable, and a free audio editing program named Audacity. Below is a screenshot of the captured code:
With an old broken headphone (2.5 mm) jack, I connected the receiver's output to the input of my laptop. 
Note: This could be dangerous! Do not do this unless you know what you're doing. Connecting a high powered circuit to your computer's sound card will probably fry the sound card and your computer!  Once connected, I powered up the receiver from a USB port and hit record while simultaneously hitting the lock button on my truck transponder. …

Simulink on Arduino!

From the Mathworks website:

Run Simulink models on supported target hardwareSimulink provides built-in support for prototyping, testing, and running models on low-cost target hardware, including Arduino®, LEGO®MINDSTORMS®NXT, PandaBoard, and BeagleBoard. You can design algorithms in Simulink for control systems, robotics, audio  processing, and computer vision applications and see them perform with hardware. This hardware support is also available inMATLAB and Simulink Student Version.
http://www.mathworks.com/discovery/simulink-target-hardware.html?s_tid=hp_mi_edu-hw_0912

Once I get it working, I'll post a short tutorial.