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Gough Lui's Blog

18 posts
One of my regular blog readers submitted an LED globe for post-mortem analysis, having failed well before the expected lifetime. I take a look inside, determine the configuration and analyze the relatively "anonymous" product which seems to show several design shortcomings which I discuss and think might be relevant to other readers at the element14 community.   The article is posted at http://goughlui.com/2016/06/01/failed-click-ltmr5w3k-5w-led-mr16-replacement-globe/   What really ...
I suppose all the car owners out there love the luxury of having a remote keyfob to lock and unlock their cars, but periodically, they need their batteries replaced. Imagine my surprise when my Dad said that "the battery doesn't seem to be replaceable" ... when every remote I had met to date had a socket for some odd-ball A21 12v cell or a lithium coin cell.   Thanks to element14 and their prompt order fulfillment, we were on our way with nothing more needed than a soldering iron, desolder ...
As many hobbyists like to experiment with wireless devices, having a good 433.92Mhz transmitter is necessary to optimize the reliability of their systems and their range. While these modules can be finicky to use for data link purposes (and I won't go into that), they are quite simple for replicating remote control signals to control wireless switches, etc. To improve range and reliability, users often recommend buying a particular sort of module or increasing the input voltage I wanted to find ...
I couldn't help but wonder, based on the previous posting and the discussion, exactly how did the 1 million combinations come about? Also, what are the functions of the fixed bits? Are they fixed pre-amble as my experience would suggest? Are there more hidden channels in the equipment than are used by the senders and that I know of? Can it cope with over-speed transmissions, shortened repetition delay times, less repetitions?   I embarked on a journey of "knowledge" by building myself a ge ...
It's been a while since I've had the time to post anything around here. Luckily, I had recently just submitted my PhD thesis so that gives me a chance to take a short break and do some of the stuff that I like.   Recently, I came across a bunch of cheap remote controlled 433Mhz power sockets which I decided to pick up, tear down and reverse engineer on my blog site. Because of the recent discussions regarding remote control that I've been a part of on this forum, I thought it would be rath ...
Thanks to element14, I've managed to get my hands on a copy of the first hard-copy MagPi magazine. It's a great milestone for The Raspberry Pi Foundation and The MagPi. Seeing as many people around the element14 circles have already reviewed and blogged about The MagPi, I've decided to blog about it on my own site instead.   To find out what I think about The MagPi, head on over to http://goughlui.com/2015/08/19/surprise-package-the-magpi-arrives-by-air-in-hard-copy/ ...
Some of you might have gotten a little suspicious seeing that I had stocked up on Wi-Pis earlier. Well, you are right to be suspicious, as I was thinking of a little Wi-Fi-based project.     I came to the realization that a wireless network's SSID can serve a "beacon" and "advertising" opportunity. Coupled with some nefarious networking tricks on the Raspberry Pi, I can make a small device that I can carry with me to advertise my site to everyone that is nearby. How did I do it ...
When it comes to me getting some work done, there is really only one place in the house where that happens. Coincidentally, it's the same place where I get some sleep, hack about with electronics, write code, record videos, take photos of products, etc. I call it my "room", it gets a little cramped, but that's the least of my issues. What I really don't need are interruptions. Creatives and coders would probably best sympathize with me - once you get in the "groove", find your "muse" or get in t ...
lui_gough

Stocking up on Wi-Pis

Posted by lui_gough Top Member Jul 19, 2015
The end of financial year sales at element14 definitely got me shopping around the Connect catalogue, where a deal leaped out at me - the heavily discounted Wi-Pi wireless adapter. Sure, it's a pretty basic device, but it's handy to have a few around to help your Raspberry Pis and other devices "go mobile" for basic data-shuffling.   I've gone into depth, tearing apart one for all to see on my blog here: http://goughlui.com/2015/07/19/teardown-element14-wi-pi-usb-wireless-802-11n-150mbits- ...
Last week, I delivered a review of the Keysight U1461 Insulation Resistance Test Multimeter. It's a lovely unit, and as with all new and wonderful tools, it's become my new "go to" unit when it comes to experiments. In my review, I commended it for the convenience feature of being able to detect an open fuse without actually taking it out and testing it by using the Earth Bond test selection as the manual said ... Had I been a little more awake this morning, I might not have had to use this f ...
Recently, after having posted a review of the Raspberry Pi 2 here, I was tipped off by mcb1 that his Raspberry Pi 2 looked a little different. A little discussion also had clem57 letting me know of some RAM differences between original RPi boards which got me wondering - what sort of variations of Raspberry Pi 2 are out there?   For research purposes, I collated photographs from different online shops, forums, from my own board, from the board my colleague received, and from Mark and put i ...
Suffice it to say, an early criticism of mine from Part 1 was a lack of decent documentation for the board itself. Oh how I'm forced to eat my words as I realize that there actually is a perfectly good board manual from Infineon that you can grab from here. To be completely fair, I have gone back and added the link for it back into Part 1 - but as to why I didn't find it when I was doing my searches still remains a mystery.   The manual itself fully details the board's design topology, cap ...
The timing of these blog posts is a bit irregular because of previous engagements with medical appointments, my PhD, other RoadTests and my personal blog. It's not easy to find the time to write the posts sometimes - but I'm sure somebody would appreciate them, so lets keep this show rolling . Before anyone asks - no I didn't receive the items, prepare them, and get something working all in a day.   The parts themselves arrived on 19th January 2015, right after I got back from my internati ...
Just around Christmas-time, element14 ran a RoadTest entitled Internet of Holiday Lights. I was a bit busy around that period, with overseas conferences to worry about, so I never bothered to apply for the RoadTest. Alas, I didn't end up missing out, because doctorcdf sent me an e-mail, letting me know that I was going to get a little bonus with my other RoadTest - I would be receiving the Arduino Uno, Arduino Yun and Infineon RGB LED Shield as well for my own tinkering. I'm so very lucky to hav ...
Well, it's past new year and I finally got a little time to sit down and do something. The first thing I did was to publish my review on the Christmas present to myself, alluded to in my last blog post here.   So, what was the present? An Agilent U1241B DMM and Accessories of course! You could've guessed it if you were following my postings about 3.5 digit multimeters and the like.   Without any further ado, here's the mega-article - a self-funded RoadTest: Review: Agilent U1241B 4-D ...