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January 27, 2015 by Jean-Luc Aufranc (CNXSoft) - 3 Comments

Linaro Connect Hong Kong 2015 Schedule and Demos

Linaro Connect Hong Kong 2015 will take place on February 9 – 13,2015 in Hong Kong, and the organization has released the schedule for the five days events with keynotes, sessions, and demos. Each day will start with the keynote including speakers such as: George Grey, Linaro CEO, who will welcome attendees to Linaro Connect, and provide an update on the latest Linaro developments Jon Masters, Chief ARM Architect, Redhat, who will present Red Hat update and latest ARMv8-A demonstrations Dejan Milojicic, Senior Researcher & Manager, HP Labs Bob Monkman, Enterprise Segment Marketing Manager, ARM, will discuss about the impact of ARM in next generation cloud and communication network infrastructure Greg Kroah-Hartman, Linux Foundation Fellow, will introduce the Greybus Project (Linux for Project Ara modular phones) Warren Rehman, Android Partner Engineering Manager, Google The agenda also features sessions covering Android, ARMv8-A, Automation & Validation, Digital Home, Enterprise Servers, LAVA, Linux […]

December 21, 2014May 29, 2017 by Jean-Luc Aufranc (CNXSoft) - 4 Comments

CubieTruck Metal Case Kit Getting Started Guide and Review

I’ve received CubieTruck Metal Case kit just over a month ago, but just like for Ubuntu on ODROID-XU3 Lite, the board could not get HDMI EDID info from my Panasonic TV, which led to a crash at boot time. CubieTech has now fixed the issue, so I’ve finally been able to complete the review with Cubieez (Cubie Easy) distribution, pre-installed on the board, and based on Debian 7.6. You can get the full hardware specs on my previous post, but the kits is comprised of four parts: CubieTruck development based on Allwinner A20 dual core processor, a rugged metallic enclosure, a 128GB SSD, and a 5,300 mAh battery acting as a UPS. I’ll start by showing how to setup the board, test SATA and Gigabit Ethernet performance, check if the battery acts as expected, try to use the board as a desktop replacement with LibreOffice, Chromium, and so on, and […]

October 11, 2014 by Jean-Luc Aufranc (CNXSoft) - 6 Comments

MT87 Digital Clamp Multimeter Hands On

When you want to measure power/current on electrical device, a kill-a-watt is the easiest method, but it’s not always possible for items like air conditioner, water pumps, etc… because they may simply be no plug to disconnect. Luckily, current clamps are made just for this purpose, where you simply place one of the two wires in a clamp / loop, and it magically measures the current. You can’t put both wires inside the loop or measurement will not work at all. The good news is that such devices are very inexpensive, and I bought MT87 digital clamp multimeter, which is also a multimeter adding voltage and resistance measurement capability, for just $11.33 on DealExtreme. MT87 comes with measurement leads (voltage/resistance only), and a user’s manual. The linked user’s manual is not exactly the same document, but very similar, and also refers to MT87C model which adds temperature measurement. There are […]

July 23, 2014February 16, 2015 by Jean-Luc Aufranc (CNXSoft) - 9 Comments

DIY Power Measurement Board

When I review media player or development boards, I’m often asked about power consumption figures. One way to measure power consumption is to use a Kill-a-Watt, but for low power devices it’s not always accurate enough, and it also includes the heat dissipation from the power adapter, which may or may not be useful depending on what you want to measure. For USB powered devices or boards, an easy way to measure power consumption is to use CHARGER Doctor, a small $5 USB dongle that displays both voltage and current alternatively. Unfortunately, most products I’ve received lately use barrel type connectors, so this little tool has not been as useful as I hoped. The only solution is then to measure voltage and current with a multimeter. Voltage is measured in parallel, so you just need to point the multimeter’s leads where you want to perform the measurements. However, the current […]

May 27, 2014 by Jean-Luc Aufranc (CNXSoft) - 2 Comments

iFans EL-PB-17 is a 3-in-1 USB Wall Charger with a Battery and an SD Card Slot

I’ve noticed TYLT ENERGY 2K a USB wall charger with an internal 2,300 mAh battery, is currently on Kickstarter for $20, and received some press coverage. The main advantages of this system is that it saves space ,and you don’t need to remember charging your phone and your USB power bank separately, it will just charge both within 3 to 4 hours. However, since I’ve recently purchased a USB solar power bank with a 30,000 mAh battery (actual 8,000 to 10,000 mAh) for about $25, I thought there must be better options with a larger batter and similar price, or cheaper price with a similar battery size. It turns out there aren’t so many options, but I did find NewTrent Travelpak Plus with a 7,000 mAH battery that sells for about $40 on Amazon and even $19 on Ebay. But I’ve found a product even more original and versatile with […]

February 21, 2014 by Jean-Luc Aufranc (CNXSoft) - 25 Comments

USB Solar Power Bank Review

A few months ago, I won a $5 coupon for DealExtreme, and decided to buy a “Portable 5V (30,000mAh) Li-ion Battery Solar Power Bank w/ Dual USB + LED – Black + White” for just over $20. For the price, solar charging was a nice bonus, and the 30,000 mAh was probably a “mistake” but it did not really matter. The SKU is gone, but 1BA-2 Solar power bank ($23.97) appears to be a very similar product. I did not plan to write about this gadget, but a few things happened that made me change my mind. First. it took over two months to reach me, instead of the usual 2 to 4 weeks. I ordered on the 9th of November 2013, and received the package on the 25th of January 2014. The reason being that the package got declined by Thai immigration (I live in Thailand). DealExtreme could not […]

January 20, 2014January 20, 2014 by Jean-Luc Aufranc (CNXSoft) - 3 Comments

Linux Kernel 3.13 Release

Linus Torvalds announced the release of Linux Kernel 3.13 yesterday: The release got delayed by a week due to travels, but I suspect that’s just as well. We had a few fixes come in, and while it wasn’t a lot, I think we’re better off for it. At least I hope so – I’ll be very disappointed if any of them cause more problems than they fix.. Anyway, the patch from rc8 is fairly small, with mainly some small arch updates (arm, mips, powerpc, s390, sparc, x86 all had some minor changes, some of them due to a networking fix for the bpf jit). And drivers (mainly gpu and networking). And some generic networking fixes. The appended shortlog gives more details. Anyway, with this, the merge window for 3.14 is obviously open. Kernel 3.12 brought new features to BTRFS and XFS file systems, PC’s GPU drivers improvements, better memory handling, […]

December 28, 2013 by Jean-Luc Aufranc (CNXSoft) - 17 Comments

$5.40 CHARGER Doctor Makes USB Power Measurements Easy

One way to make power measurement for USB powered devices is to make your own USB cable to allow for current measurement via a multimeter, but if you think it’s just too much hassle, I’ve found and purchased a small test device called CHARGER Doctor that shows voltage and current on a 4 digit display, and sells for $5.40 on DealExtreme. The device features a USB female out port, and a USB male input port, that you can place between your USB power adapter, and the cable to your device to alternatively display voltage (4 seconds) and current (9 seconds). It can be used for power consumption measurements, to test if your charger is working normally, or finding out the power adapter that will charge your phone the fastest. It’s said to support measurement between 3.5 to 7V and 0 to 3 A, with an accuracy of +/- 1%. I’ve […]