Nov 23

In a Pickle with OpenVPN

This is a story of trying to do the right thing… without reading all the instructions.  I recently was setting up OpenVPN for my home network.  The instructions are pretty strait forward.  For those of you who are security conscious, there is even an option to drop elevated privileges in Linux.  That sounds good, right?  Well, what happens when you try to tear down the VPN connection, without elevated privileges?

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Permanent link to this article: http://blog.curioussystem.com/2016/11/in-a-pickle-with-openvpn/

Aug 16

Altium Design Security Advisory

After troubleshooting a problem I was having with the supplier links in Altium Designer, I recently found that, for at least one of the supplier links (Mouser), your login credentials are being passed in clear text.  Even better, they are in XML that clearly tells anyone watching what they are.  Altium has been notified of this.  I haven’t heard back.  So, until a fix is rolled out, don’t use the Mouser supplier link with your login credentials.

Permanent link to this article: http://blog.curioussystem.com/2016/08/altium-design-security-advisory/

Mar 26

Pro Tip: Moving Multiple Component Primitives in Altium Designer

Sometimes you have a design where you don’t want to make a new footprint, but need to move a certain track or via 10 mil one way… for 30 copies of the same footprint. Read the rest of this entry »

Permanent link to this article: http://blog.curioussystem.com/2016/03/pro-tip-moving-multiple-component-primitives-in-altium-designer/

Jan 01

Lighting the LEGO Salt Lake Temple

2015 was a busy year.  The project that I had the most fun with was a bit off the beaten path compared to what I normally do.  This started off as a fun project for a friend.  It started off with, “I have this LEGO project I need to put LEDs in, can you help me?”  Sure… Read the rest of this entry »

Permanent link to this article: http://blog.curioussystem.com/2016/01/lighting-the-lego-salt-lake-temple/

Jan 01

Gotcha with the TI TCA6408A

The TI TCA6408A is a wonderful little chip when you need a few more I/O. It’s simple to program and use… so why did pressing the button attached to one of the pins cause the chip to reset? Read on to find out.
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Permanent link to this article: http://blog.curioussystem.com/2015/01/gotcha-with-the-ti-tca6408a/

Jan 01

iBeacons on the TI CC2541

I’ve been working on a new project that involves the creation of an iBeacon.  For those not familiar, an iBeacon uses a Low Energy Bluetooth (BLE) advertisement to tell devices, “you are here.”  I chose the TI CC2541 for the project because it is very integrated (low external part count) and the power draw is low. Read the rest of this entry »

Permanent link to this article: http://blog.curioussystem.com/2014/01/ibeacons-on-the-ti-cc2541/

Jan 01

Capacitive Touch Sensing on the MSP430 – 2013 Edition

I took a look at capacitive touch sensing on the MSP430 in 2011 and it was a little… lacking. I had another project come up and had a chance to play around with it again a couple months ago. It’s nice to see the changes two years have made to the framework provided by TI.
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Permanent link to this article: http://blog.curioussystem.com/2014/01/capacitive-touch-sensing-on-the-msp430-2013-edition/

Aug 06

VHDL Memory Decoder for BF51x

This is just a quick snippet of code for you if you happen to be using a Blackfin BF51x processor and have some space and pins on an external FPGA to spare. Read the rest of this entry »

Permanent link to this article: http://blog.curioussystem.com/2013/08/vhdl-memory-decoder-for-bf51x/

Jul 23

White Spaces Standards for Telemetry

You’ve heard of cognitive radio and the promise of bandwidth where the TV channels are not.  We now have a standard for at least one of those.  Please welcome Weightless to the list of standards for unlicensed “white space” communications.  I recently heard a good presentation on what Weightless is and what its potential is.

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Permanent link to this article: http://blog.curioussystem.com/2013/07/white-spaces-standards-for-telemetry/

Jul 09

Nyquist Signal Expansion with Python

I’ve recently been reading up on software defined radio (SDR).  An epiphany that I had recently was that if we have sampled a signal so that we meet the Nyquist criteria, we can reproduce the points between the points we took. Read the rest of this entry »

Permanent link to this article: http://blog.curioussystem.com/2013/07/nyquist-signal-expansion-with-python/

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