eMMC Adventures, Episode 4: Recovering data from physically damaged BGA eMMC Flash storage chips

As seen on Hackaday!

The ball grid array (BGA) chip package has been instrumental in getting modern electronics to fit in smaller and smaller spaces, as it uses tiny balls of solder on the bottom of the package to make electrical connections, instead of copper leads on the edge of the chip package. This allows for hundreds of connections to be made in a small amount of PCB area, but their size also makes them very vulnerable to damage as well.

One common way for BGA chips to become damaged is called “pad cratering“, where the copper pad on the package’s substrate (basically a wafer-thin circuit board) separates and leaves behind a crater.

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Ramble: 2018 in review

Can you believe it? Another year has gone by in what seems like an instant – and boy has it been quite the year for the blog.

Smash Hits

This year has seen quite a few popular posts, with my blog post about building my own memory card seeing a whopping 11,450 views in March alone, totaling 18,195 views this year; in fact, March represented the second-largest view count of all time on my blog with 23,955 views, a tad under July 2015’s 25,100 views. My blog post about running Doom on an oscilloscope netted 5,670 views, and another post where I fixed an Intel Atom-based tablet well beyond economic repair received 2,700 views. Interestingly enough, my blog posts about the Kentli PH5 Li-ion AA battery (both its teardown and review) received 5,280 and 3,250 views, respectively – both without seeing any significant external referrals except through search engines; this also applies to the 2,900 views on my Kitchenaid induction cooktop blog post, which seems to imply that plenty of these cooktops are encountering problems in the field.

Views, Views, Views!

This year’s view count is the second best on record, scoring 126,250 views, compared to 2016’s 140,000 views. This is a good comeback after 2017’s significantly reduced viewership which only saw 99,390 views, and is a decent step ahead of 2015’s 120,140 views.

However, it appears the number of views from each visitor has decreased over the years (that is, it appears that readers aren’t staying as long on my blog as they used to). The drop began in mid-2016 after I changed my blog over to ripitapart.com domain instead of the .wordpress.com subdomain that it used to be. Perhaps this is a direct consequence of my domain change, or maybe it’s just a coincidence and readers just don’t stick around as long anymore.

This (Ad) Space For Rent

This marks the first full year that I’ve taken advantage of the WordAds program, allowing me to monetize the advertisements that appear on my blog as a natural consequence of running on WordPress’ Free hosting tier.

This year brought in $194 USD in ad revenue, which has helped pay for my domains and G Suite registration through WordPress in full (totaling $125 USD per year for three domains and G Suite). This means that simply keeping the blog alive no longer is a strain on my wallet, which is a tremendous help for me.

Looking Forward

As we say goodbye to 2018 and welcome 2019 with open arms, there’s always room to grow the blog further. I’ve been considering avenues like running a vlog on YouTube, and maybe even viewer contribution programs like Patreon (although recent issues with the aforementioned platforms have given me pause).

I still have a bunch of blog posts simmering on the back burner, so to speak. Some of these include data recovery from physically damaged eMMC modules (yes, I’m still doing stuff with eMMC 🙂 ) and upgrading the RAM in the cheap tablet I mentioned earlier. The upcoming year will be full of changes in my personal life as I finish my post-secondary education and being my search for full-time work.

All in all…

Happy New Year! Thanks to all my viewers – I couldn’t have come this far without you! –Jason

Performing safer AC line voltage measurements using isolated amplifiers

DISCLAIMER: AC line (mains) voltage is not something to be taken lightly! Attempting to safely handle line voltages while minimizing the risk of harmful or fatal electric shock is the main motivator for me to design and build this circuit. However, I am no electronics engineer and I definitely have no formal training on international standards pertaining to high-voltage safety. I accept no responsibility, direct or indirect, for any damages that may occur if you attempt to make this circuit yourself, including personal harm or property damage. Additionally, there is no warranty or guarantee, express or implied, on any content pertaining to this blog post (or any other posts).

UPDATE (November 19, 2018): Added isolation voltage ratings for the amplifier and DC-DC converter.

As seen on Hackaday!

Back in mid-2017 I won a Keysight DSOX1102G digital storage oscilloscope (DSO), a piece of equipment long on my wish list but never acquired until then. One thing I’ve wanted to be able to measure with an oscilloscope for a long time was the waveform of the AC utility (in other words, the wall outlet). However, doing so presents a very real risk of blowing equipment up or shocking yourself (and possibly other people). In order to prevent this, I needed a way to perform measurements on the AC line without being directly connected to it; in other words, I need galvanic isolation.
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eMMC Adventures, Episode 3: Building a custom adapter to use cheap eMMC-based 32GB SSD modules

As seen on Hackaday!

While on my quest for more eMMC-based storage devices, I stumbled upon a few devices that piqued my interest: eMMC-based SATA SSDs! I found two models of particular interest: Dell had M.2 modules with a 2.5″ adapter, and HP had custom boards intended for use in cheap laptops (for example, the HP 14-an012nr). Although the former was easier for me to use (but not acquire), I will be focusing on the latter in this blog post.
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Gaining access to the Windows CE desktop (and Doom!) on the Keysight DSOX1102G Oscilloscope

As seen on Hackaday!

TL;DR – Yes, the Keysight 1000 X-Series oscilloscope runs Doom! The journey getting there wasn’t easy, though.

The oscilloscope is one piece of equipment that any self-respecting electronics enthusiast should have. In short, oscilloscopes let you view the electronic waveforms of a circuit, and digital storage oscilloscopes (DSOs) are especially useful since they can reveal infrequent glitches on signals that an analog oscilloscope or a multimeter wouldn’t pick up.


Keysight DSOX1102G oscilloscope

The subject of my blog post is the DSOX1102G from Keysight Technologies (formerly Agilent), which is part of their low-end offerings that still offer very good value compared to their competitors. As with most of their oscilloscope offerings, they run an embedded operating system called Windows Embedded CE 6.0 (AKA Windows CE or WinCE), but as with most WinCE applications, you almost never see the Windows interface since it’s hidden behind a custom user interface.

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Upgrading a passive Power over Ethernet splitter with 802.3af compatibility

As seen on Hackaday!

If you haven’t heard of Power over Ethernet, chances are you’ve experienced its usefulness without even knowing about it. Power over Ethernet (PoE for short) does exactly as the name implies: power is sent over the same Ethernet cable normally used for data transfer. This is often used for devices like IP phones and wireless access points (often you see these APs in restaurants and other establishments mounted to the ceiling to provide Wi-Fi access), as it is far easier, cheaper and safer to provide low-voltage power instead of wiring in AC power which requires the help of a licenced electrician.


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WordAds Adventures, Episode 4

Oh my, it has been a while since the last update, hasn’t it?

Results for February to June 2018

Since my last report, I managed to earn $45 in one month after getting my blog post featured on the r/hardware subreddit, which then made its way to Hacker News (a news aggregation site), bringing the most traffic to my site in many years; March 2018’s view count was the second highest on record, bested only by June 2014’s 25,051 views which were not monetized. I even received my first payout on May 29th.

However, the rest of the months have been less fruitful, especially as of late. Since May, my monthly ad revenue has dropped below $10 USD/month. I thought that the boost in traffic from March would result in more views after the fact – I could not have been more wrong.

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Status Update: Of Phones and Fire

Things might be on a bit of a hiatus for the next little while. My trusty Sony Xperia Z5 Compact literally went up in flames a few hours ago, and I need to find a replacement very soon, as well as recover any data that wasn’t saved to my SD card. Thankfully, apart from a sore throat and burning eyes from battery smoke, I am doing fine (as well as my house).


My Sony Xperia Z5 Compact… after the lithium-ion battery fire.

Once things settle down, I’ll hopefully have a juicy story about lithium-ion battery fires and (failed) eMMC data recovery.

UPDATE (May 18, 2018): I upgraded to a Samsung Galaxy S9 a couple days ago. The eMMC chip I desoldered from the Z5 Compact is effectively bricked, as it only identifies itself but no data can be read – I suspect that the intense heat must have “baked” the NAND flash and result in too many uncorrectable bit errors that the firmware couldn’t recover from. There goes my progress in Angry Birds 2 (among other data)…

Recovering Cookie Clicker saves from an offline installation/backup of Google Chrome

Update (August 29, 2018): Turns out cleaning out your cookies/cache will erase your Cookie Clicker save. Who would’ve thought…

Cookie Clicker saves: You don’t realize the importance of saving your progress until you lose your save data. A few days ago I opened Chrome to my always-running instances of Cookie Clicker, but found that all of my progress was deleted (and it was showing a “Don’t forget to back up your save” message just to add insult to injury).

My heart sank when I realized that one of my runs, over three years old, had suddenly vanished into thin air. I tried restoring Google Chrome’s data via a Shadow Copy; no dice. I tried using my Windows Home Server 2011 backups, but realized that it would take over an hour to restore my Chrome folder. After much frustration, I decided to retrieve and examine Chrome’s Local Storage folder and see whether I could retrieve my save files that way – and it worked! Here’s how to recover your own Cookie Clicker saves…

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Completed: Self-discharge test of Kentli PH5 1.5V Li-ion AA (Part 6)

Looking for the teardown or how well the Kentli PH5 battery performs under load? Click the links to learn more.

It’s finally happened – the self-discharge test of the Kentli PH5 Li-ion AA battery has finally come to an end… and it only took almost 3 years!


april 29 2018 stats

Kentli PH5 self-discharge test statistics

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eMMC Adventures, Episode 2: Resurrecting a dead Intel Atom-based tablet by replacing failed eMMC storage

As seen on Hackaday!

Recently, I purchased a cheap Intel Atom-based Windows 8 tablet (the DigiLand DL801W) that was being sold at a very low price ($15 USD, although the shipping to Canada negated much of the savings) because it would not boot into Windows – rather, it would only boot into the UEFI shell and cannot be interacted with without an external USB keyboard/mouse.

The patient, er, tablet

The tablet in question is a DigiLand DL801W (identified as a Lightcomm DL801W in the UEFI/BIOS data). It uses an Intel Atom Z3735F – a 1.33GHz quad-core tablet SoC (system-on-chip), 16GB of eMMC storage and a paltry 1GB of DDR3L-1333 SDRAM. It sports a 4500 mAh single-cell Li-ion battery, an 8″ 800×1200 display, 802.11b/g/n Wi-Fi using an SDIO chipset, two cameras, one microphone, mono speaker, stereo headphone jack and a single micro-USB port with USB On-The-Go support (this allows the port to act as a USB host port, allowing connections with standard USB devices like keyboards, mice, and USB drives).

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WordAds Adventures, Episode 3

Another month has passed and that means another round of ad revenue trickling in.

Results for January 2018

This is rather interesting – despite getting more views than December 2017, the pay rate was lower than before!

Curious to see what the dollar-per-impression rate was for each month, I tabulated the results and graphed them:

Period Earnings Visitors Views Ads Served $/Impression
Nov 2017  $     5.03 3833 8538 4648  $ 0.00108219
Dec 2017  $   15.18 4344 9732 17369  $ 0.00087397
Jan 2018  $   11.96 4359 9458 17887  $ 0.00066864

WordAds Rate Nov 2017 to Jan 2018

That is a pretty linear drop in dollar-per-impression rate. Perhaps this is due to ad market fluctuations, or maybe WordPress is “incentivizing” increased viewership to maintain ad revenue. Who knows? Either way, it will be interesting to track this trend as time goes on.

Mini-Ramble: WordAds – I think it’s working!

Over a month has passed since my first post about seeing where the WordAds train will take me and my blog, and the first (meaningful) payout numbers have rolled out.

Current Earnings

ss (2018-01-05 at 12.42.57)

WordAds earnings for 1/3 of November 2017, and all of December 2017.

Not too bad – in 1 1/3 months, I’ve earned $20.20 USD in ad revenue. In December alone I earned $15.18 from 17,369 attempted ad impressions; with 9,732 views in December this equates to an impression-to-view ratio of 1.785.

Assuming that I receive the same number of views per month, $15/month * 12 months = $180 USD/year. With this amount of revenue, my blog can finally run itself!

Blog Budget Breakdown (yay, alliteration!)

Item  Value 
Yearly Ad Revenue ($15 USD * 12 months)  $ 180.00
Domain Name Registration (1 year for 3 domains, assuming CAD-to-USD conversion rate of 0.8x)  $  (76.80)
G Suite (1 year, assuming CAD-to-USD conversion rate of 0.8x)  $  (48.00)
Final Balance (USD)  $   55.20

If I assume that my current view count doesn’t change, this would leave me with a little over $50 USD in pocket change by the end of the year. Perhaps this money could be put to use to buy some more things to make blog posts with – maybe some iPhone batteries or an eMMC module or two…

Once again, thanks to all of my readers – I couldn’t have done any of this without you! 😀

Packing Boxes & Stomachs: Edible foam packing peanuts?!

Earlier today I picked up my replacement fire extinguisher from Kidde (check out the recall here) and noticed the packing peanuts weren’t the pearlescent S-shaped Styrofoam peanuts I was used to seeing – rather, they looked like fluffier versions of Cheetos (cheese puffs). This piqued my curiosity… can you eat these?

To see whether these were at least water-soluble, I poured a small amount of water on one of these peanuts, and it dissolved within seconds. Now that I’ve determined that these packing peanuts are indeed the biodegradable type, it’s time to take the taste test…


A biodegradable (and edible!) foam packing peanut.

… So, how do they taste?

Perhaps surprisingly, they taste faintly of popcorn; I was expecting them to taste more unpleasant like cardboard, but these had a fairly agreeable yet neutral flavour and I suspect that they can be seasoned with a dry popcorn seasoning with little issue, but they may need a light spray of cooking oil in order to make the seasoning adhere to the peanut.

There are multiple manufacturers of biodegradable packing peanuts (one example is Puffy Stuff), and these are made from some form of starch like corn. However, these packing peanuts are basically devoid of any significant nutritional value, making them less attractive to animals and/or pests. Reference.com says that they are not manufactured under food-safe conditions, and are therefore not recommended for human consumption.

… I’m still going to eat these anyway. 😛 *crunch munch*

Self-discharge test of Kentli PH5 1.5V Li-ion AA (Part 5)

It’s amazing – 894 days (and counting) have elapsed since the start of my long-term experiment, documenting the real-world self-discharge behavior of the Kentli 1.5V Li-ion AA battery… and it’s still ongoing! How have things fared so far?

Surprisingly, even after spending nearly 30 months on the shelf, there is still 12% capacity left. The voltage has dropped from 4.216 to 3.692 volts according to my bq27621 Li-ion fuel gauge; the State of Charge (SoC) has dropped 50% since my last update.

november 28 2017 stats

The linear end date prediction is holding pretty steady, having changed slightly to an estimated 0% charge date somewhere in February 2018.

On that note, I’m impressed by how much attention this little battery has received, even years after my initial review. Every day I see a handful of views checking out the teardown and performance metrics, and there seems to be hardly any sign that this will change anytime soon. To everyone who stops by to check out my blog posts: thank you! 🙂

Mini-Ramble: So… WordAds!

I’ve finally done it – I took the plunge and tried to find out if I can enable advertisements on my blog (*gasp*) through the WordAds program – and as it turns out, yes!

Given what I’ve seen online, WordPress has always been vague on one of their acceptance criteria: views per month. They state on their own FAQ that they require “thousands of pageviews each month to earn meaningful revenue”. There were no clear answers from other bloggers either. In my case, I’ve had a paltry 8,000 views/month on average ever since I registered my domain, ripitapart.com (I had over 10,000 views/month when I was using the free WordPress domain). Given that I tend to blog about relatively niche topics (who really cares about battery fuel gauges, anyway?), this is not particularly unexpected; this isn’t helped by the fact I haven’t been posting frequently as of late (so far I have dozens of draft posts, with some that probably won’t be completed as they have essentially gone ‘stale’).

Application for WordAds

I submitted an application request for the WordAds program on November 20, 2017. Immediately after filling out the form I was given an automated message that I was initially declined due to insufficient viewership (but they would keep my request open until I had achieved enough page views per month). However, the next morning I awoke to an email that read “Welcome to WordAds!” – a pretty nice way to start the day. I’m guessing that the number of outstanding applicants were low, and that my content is original enough to warrant acceptance into the WordAds program. Perhaps there is a manual component to reviewing these applications?

So, what about earnings?

Given that it hasn’t even been a week since I was accepted into WordAds, it’s far too early to say how much I’ll actually get out of these advertisements; on that note, since I use WordPress’ Free plan/tier, there were always advertisements on my site (I didn’t get any revenue from those ads, however). Given how most people likely use an ad blocker (myself included), this will further reduce the amount of revenue I can generate from this blog. WordAds will only pay out advertisement revenue when earnings accumulate past $100, which means I won’t actually receive anything until that point… and who knows how long that will be.

Unlike other advertisement platforms, I do not get real-time analytics of ad traffic, and statistics for the month are only updated near the end of the next month (in my case, this means I will not see any information on November’s earnings until the end of December). One common complaint about WordAds is the lack of customization for ads that will be shown; on the flip side, the advertisement system does all the back-end work so I don’t need to lift a finger in that regard.

Your thoughts?

This is the first time I’ve ever tried online traffic advertisements and site monetization, so saying I’m inexperienced in this field is a bit of an understatement. However, I’m curious as to where this will go, and how this will affect my reader base.

What’s your experience with ads on my blog? I’d love to hear your comments on it, especially as time goes on.

Domain Get… again!

Another domain? You betcha!

My blog is now also accessible at http://jasongin.com. There isn’t any real different content if you follow the link; it just links to my normal domain at http://ripitapart.com.

But why another domain?

In a nutshell, it’s for the ability to register a more professional email address for work-related use (think resumes and so on). Coupled with WordPress G Suite integration, this allows me to easily create an email address that is truly unique (since a similarly named Gmail address has already been taken 😛 ).

The cost isn’t too high, about $100 CAD for a year’s worth in subscription fees.

Now, for formal communication, I am reachable at jason.gin@jasongin.com but any other conversation should be directed towards my personal email, ginbot86@gmail.com.

Ramble/WordPress auto-post time: 2015 in review

The WordPress.com stats helper monkeys prepared a 2015 annual report for this blog.

Here’s an excerpt:

The Louvre Museum has 8.5 million visitors per year. This blog was viewed about 120,000 times in 2015. If it were an exhibit at the Louvre Museum, it would take about 5 days for that many people to see it.

Click here to see the complete report.

Self-discharge test of Kentli PH5 1.5V Li-ion AA (Part 1)

As an extension to my previous performance analysis of Kentli’s PH5 Li-ion AA battery, I fully charged an unused PH5 and left it on my desk to self-discharge. Every now and then, a Texas Instruments bq27621-G1 fuel gauge is hooked up to the Li-ion battery terminals (in the case of the PH5, the recessed ring around the 1.5V terminal) and the bq27621’s default settings are used to measure the voltage and state of charge.

I started this test on June 18th, 2015 and will keep taking occasional measurements until the protection IC in the PH5 shuts down.

Since the 18th, the voltage dropped from 4.216 volts down to 4.192 volts as of July 6, 2015; the bq27621’s State of Charge reading remains at 100% for the time being. The voltage drop has been fairly linear so far, but I expect it to taper off as the battery discharges to the Li-ion cell’s “flat region”, and only after that do I expect the cell’s voltage to decline more rapidly.

Ramble/WordPress auto-post time: 2014 in review

The WordPress.com stats helper monkeys prepared a 2014 annual report for this blog.

Here’s an excerpt:

Madison Square Garden can seat 20,000 people for a concert. This blog was viewed about 66,000 times in 2014. If it were a concert at Madison Square Garden, it would take about 3 sold-out performances for that many people to see it.

Click here to see the complete report.