Replacing Galaxy S6 battery

My daughter’s mobile phone was going flat quickly. On looking through forum postings it seemed a common problem after a few years of use.

On to repair! or so I thought.

Samsung and other manufacturers have made a good job of bricking their phones together with glue. Instead of lots of tiny screws they now use glue strips to hold the components in place – perhaps making manufacture easier, but certainly making repair harder.

There is an excellent guide on how to do the replacement by yourself over on iFixit, as well as a package of the battery and replacement glue strips to reassemble the phone. However, be aware that the whole thing isn’t for the faint of heart!

As a side note, the procedure using the iOpener did not work for me – I had to use a commercial heat gun and really blast the bottom cover to make the glue strip soften. Perhaps a hair dryer could also be used to do this.

The result is a phone that works, a happy daughter, and a proud dad!

Corona-virus and webcams

If there is one thing that the current pandemic of COVID-19 shows us, it is that the world is more connected than we feared.

We think that the modern world is isolated by social networks and technology, but the surprising rapidity of international contagion seems to say just the opposite: that a storm somewhere else in the world can rapidly affect multiple and many countries. It seems that we are still very close to each other.

One strange side-effect has come home to me today. I went searching for webcams for my personal use and potentially to use at work. I work as a building caretaker for a large church with multiple buildings and a 500-seat auditorium. Waypoint Church – check them out, they are awesome! As travel restrictions come into play the core team are thinking of recording videos and sending links via email to church members. I think we should look at doing live streaming and webcasting. However, even Amazon was short of supply on webcams!

As we discuss this it brought into play the digital generations. We commented that some church members don’t have email addresses, some don’t use specific social media platforms, and some don’t even have computers! While most will have mobile phones even this cannot be assumed for the very oldest and vulnerable. Part of the crisis means that schools are looking at using webcams to delivery lessons to their pupils and of course this has created a run on the supply of cheap, sensible webcams such as the Logitech C270 or C920.

While I’m replete with webcams of all types (having used them previously for monitoring 3D printers and the like) the shortage does show the results of unintended consequences. The government announces school closures, and sales of webcams, or cheese, or blankets goes through the roof. Strange times, strange times indeed!

Accessing a Vigor 130 modem

As intimated earlier, my Vigor 130 modem is not accessible as it sits behind a router. The 130’s address range is 192.168.2.1/24, while my LAN sits on a 192.168.1.1/24 range.

Try 1

Although Draytek have an article about using tagged & untagged VLANs to access these modems behind routers, the setup didn’t work for me (I suspect their use of the ‘0’ VLAN tag as shorthand for an untagged VLAN didn’t work for the particular router I have).

Try 2

Instead, I want to set up a route policy and any requests for the address range of the modem should be passed back through the WAN2 interface to be resolved there. At least I think that is how it is done. Using Routing / Load-Balancing Route Policy I setup a policy so that any requests on the 192.168.2.1/24 range go via WAN2, and should go to the modem. However it doesn’t work.

Try 3

I think I have the wrong concept about the route policy and have to instead use a virtual WLAN such as WLAN5? An excellent article explained it better, however it was for another type of modem. Dantheperson’s explanation was that by adding a secondary static route and pointing that at the WAN interface, “Now when your PC routes the request for 192.168.0.1 to the router, the router knows it can access that address via the WAN interface, instead of forwarding it to the default “internet” interface.” This is what I want to do, however I think that the Vigor router uses the permanent virtual circuit (PVC) idea to do the same thing. So my current setup is Route Policy –> virtual WAN5 which sets up a VLAN on the WAN2 interface. It still doesn’t work.

Argggggh!

Strange latency spikes

I’ve purchased a new Vigor 2862Vac to be the main wireless and router at my house. I used to use a Fritz!Box 7390 and loved the ease of use combined with the technical power of the combined modem, router, firewall, VoIP and DECT base station. But things are getting older and with new VDSL/2 capabilities I have swapped from a cable connection to a fibre-to-the-cabinet through another provider, Andrews and Arnold. They are stupendously great, and techies all the way. Don’t expect any hand-holding.

But I’m starting to see some external wierdness after installing this new router. I have enabled ICMP from the WAN (ie. , being able to be pinged from the Internet) as I run an external monitor to test my broadband access from outside the home. This works using a Firebrick device that can sustain many thousands of ping requests per second and attempts to access my public internet address once per minute, then graphs the results.

The graph is showing some strange latency spikes:

Probes from outside

Although I haven’t noticed any particular instances of slowdowns locally, this is a little worrying as my graph was nice and clean before, and those yellow spikes are a little regular to me … in fact, too regular at 30 minute intervals every couple of hours.

So a little digging – I run a Vigor 130 modem on the front-end that does the VDSL dialling and syncing. This is great, as I can then take the signal via Ethernet connection into whatever I like: a switch, my own router, pfSense running on a PC, or a commercial AP/firewall such as the Vigor 2862Vac. What does cause an issue is that the Vigor 130 runs on its own IP address range, and once it passes the connection to the router it is no longer accessible. I need to access it to see if the spikes are coming from it or the router.

VR

I been using my VR (Virtual Reality) setup more. Having brought it several years ago when Bitcoin was at a peak I could cash some in and purchase an expensive item without authorisation from my wife. Having used it with around 30 or so purchased games, and more I’ve come to realise what works best in Virtual Reality.

Toys.

Toys, or more specifically miniature models in a VR environment, work well because they are unreal. In those games you act like a sort of ‘giant’ that manoeuvres an environment to progress the game, perhaps by removing obstacles for your mini protagonist or remotely causing them to battle or manipulate something around them. It gives the experience of a space where your expectations are that you’ve never been there before, so you are not prepared to compare what you are seeing with what you are feeling. Nothing clashes.

Compare that with games that mimic an environment. Having played a fair share of standard PC games ported to the environment there are quite a few that fall flat. Take the space exploration genre, for example – this is replete with with efforts where you physically move through nicely depicted environments and float along by grasping handholds, or using jet packs. While that’s nice, it can be nausea inducing and actually the contrast between your actual body experiencing gravity and the visual simulation of your eyes makes it less than enjoyable. ‘You’ clash with you, as seen through your eyes.

I’ve just prepurchased the game Alyx from Valve to try on my setup when it releases. I did this for a couple of reasons – I like Valve games such as Half Life and enjoy the immersion of it all, and also I am reassembling my VR set up into a better room. Take a look at Skyrim in VR – it is also outstanding! Others that I like that use the idea of ‘toys’ are ones like Moss and A Fisherman’s Tale where the environment is unreal or fantasy. For some reason my immersion is better in those environments than when they try to mimic real life.

Perhaps we should be happy and say VR ≠ real life.

Of sealing wax, and cabbages

I’ve a new phone, and that means a new phone charging stand.

Although the EU standardised on a common external power supply for small electronic consumer devices in 2009, followed by many international and national standards bodies, my new phone uses the USB-C plug. This isn’t a problem as I use a USB charger that has five slots from which I can run either micro-USB or USB-C cables, depending on the need.

What is far more interesting is the charging stand.

For every new phone that I purchased either for work or leisure, I had to replace the charging cable and get a new one for my work backpack, buy a new phone cover, get a new desk charging stand plus a new car holder while driving. This added considerably to the cost of a new unit but was often overlooked. Since retirement I’ve done away with a lot of these distractions and instead:

  1. Use a universal car holder without active power. The reason I can do this is that new phones:
    • hold their charges for much longer, up to 3-5 days for some Huawei phones, and
    • I don’t drive as much, and journeys are shorter.
  2. I still get a new, custom fit phone cover.
  3. Buy a generic desk stand which I adapt using Sugru. These stands are much cheaper than the branded ones and with some plastic magic easily adaptable to the shape of the new phone.

This is how it is done.

First you need the phone to be in its cover, as the dimensions will fit exactly to the outside of the holder. Place the Sugru into appropriate areas of the holder – for me it was the rear kickstand which supports the phone at a correct angle to engage with the USB connector, and the bed of the USB connector. Depending on what generic stand you get this may be different.

Using cling flim, Saran wrap or whatever it is called in your country then cover the back of the phone and press it into the bed of the stand, engaging the USB connector and allowing it to rest gently on the back of the stand. I then leave them for a short time, perhaps several minutes, and gently remove the phone and cover allowing the cling film to stay for some while longer.

Once the Sugru has gone ‘green’ (easily able to be cut but not so hard that it is difficult to work with) then I trim off unneeded parts and neaten. The photos show a couple of examples of a micro-USB and USB-C stand for specific phones. The overall fit is tailored and exact which reduces the strain on the power connector and prolongs the life of the phone.

Egg robot Number 1

The first egg robot was hatched when Bruce Shapiro in 1990 dreamed up the Eggbot™. Bruce published it as an open-source design for both software and hardware however the name is trademarked. While it is available for purchase as a whole machine, I wanted to see if I could 3D print one myself since the initial cost was large.

I found another design by Probot that seemed to do a reasonable job, and although many of the other ones such as the SphereBot are larger this one seemed to produce reasonable quality and I had most of the parts:

  • 308zz bearings
  • 3D printer to print parts
  • Arduino
  • silicon egg cups moulds
  • stepper motors
  • stepper motor controllers

… and that was about it. Most of those I had, the rest I could order easily (for example, I had Nema-17 steppers and this only required 28byj-48 ones, either 5V or 12V). So, in a fit of decision I launched into building it and surprised myself with how quickly it came together.

The base and cover are easy to print with the sides of the cover bending into a living hinge. The ends are bolted shut and there is a sliding swing arm and end stanchion. The living hinge is an interesting design choice which leads me to believe that the designers were very familiar with 3D printing as it avoids overhangs in the upright sections of the print. It does make a very neat and attractive package when finished.

The challenge comes because of the interaction between different things which were not designed together: hardware and software. The original hardware has an actual PCB created to control the movement, whereas the design I am using replaces that with an Arduino running software called EggDuino. That software has to emulated the responses and obey the commands expected from the original PCB so that it can print things. All this is controlled by an extension to the open-source software called InkScape that sends commands to the egg-robot! Lots of moving parts in this design and 3 different things created by different people does give lots of room for error. So the process goes like this:

Inkscape → Eggbot extension → Arduino running EggDuino → egg

The ‘tail stock’ – if this were a lathe – is based on a printed part with a 308zz bearing inside. The 308zz are a very common type of bearing, sometimes called ‘skateboard bearings’ as they are ubiquitously used for skateboard wheels.

Once completed the whole machine is connected to a computer by USB cord and you use Inkscape to create and print the eggs.

Blutack and masking tape

I’ve started masking the base PCB of my WiFi doorbell and I am using both masking tape and Blutack. I discovered the Blutack while going through my stationery drawer looking for something similar to the latex masking fluid which is used in real electronic waterproofing. I had thought of using an eraser which would be soft and pressed onto the micro-USB port would mostly seal against the conformal spray. The Blutack is now my best friend for masking, even if the spray dissolves it some and leaves it sticky – but the easiest way to remove Blutack is using more Blutack, which worked very well on the PCB board.

I decided to leave the camera alone as it was already in a unit, and previous experience has taught me that getting near lenses with any type of fluid or compound invariably means that you leave smears, no matter how careful. As it is a single unit I’ll seal around its seating and hope that that helps prevent major water ingress into the rest of the mechanism. If the video feed fails, I’ll know better next time!

The speaker at the bottom is also hard to waterproof: cover it in conformal fluid or seal it in somehow would mean that it likely could not be heard, and similarly for the microphone which needs to vibrate to detect speaking. I’ll simply seal around the edges of those components and hope that their internals are okay with a little moisture.

Miniature speaker at bottom of unit

The door-press button is difficult, as it needs to move to trigger the micro-switch, but isn’t sealed around its edge – I assume that rain against the front of the unit seeps through capillary action around the edges and into the major internal space, and thence via condensation onto other surfaces. That’s bad, as it possibly means I cannot seal one of the areas of major ingress.

Press button is … difficult

Experimenting is fun, so I am going to try a thin film of plastic wrap (sometimes called ‘cling film’ here – other names elsewhere!) glued to the rear of the face plate to see if that works. The plastic film should bend enough to allow depressing the micro-switch, but the real challenge will be getting it sealed against the back of the face plate. I will try a rim of silicone sealant to which I will press a square of plastic film.

Overall the task took me the whole day. While that seems a little crazy (and you may prefer watching box sets on television), I saw it as a learning exercise and bit of a challenge! I’ve thought through how to waterproof a very difficult piece of equipment and although the proof that it’s successful still remains, I am overall pleased with the result and would attempt something similar with greater skill.

The doorbell does work now and I have tested it both via pressing the push button and the mobile app. Bring on the rain!

Waterproofing electronics

I’ve been interested in getting a WiFi doorbell for my house. Having looked at the issues surrounding the two market-leading brands, decided to go the cheaper route and purchased a no-name brand from China.

The doorbell and separate chime are excellent, but are not waterproof.

I experienced this after having had the doorbell working for a week or so – England is anything but dry and before Christmas a downpour lashed our front elevation for around 18 hours, thoroughly wetting the outside of the unit. While the camera still worked and I could connect to it from my phone app, I did not suspect that water had entered the compartment. When it did occur to me was after one door press by the post delivery worker that left a lingering ‘ding dong’ in the air after it should have stopped.

The next day the lingering ‘ding dong’ did not stop at all and I had to remove power from the chime unit. I opened the unit and saw moisture inside and dried it out, but realised several days later that I could not connect to the unit from the mobile app and so have taken it off the wall to fully waterproof it. Thankfully the ringing had stopped but I worried that it could re-occur in the middle of the night or while we were away.

Components of the video doorbell

I will use electronic conformal liquid in a spray form to coat the PCB and internals, and will try to either glue non-moving parts in place with silicone sealant as well as putting a bead around the external rim of the back-plate. My challenge is that there is several holes where ingress is needed for the microphone and the speaker! How to waterproof those? And the press button will still have to move inwards to depress the micro-switch and if glued solid it could not do this.

The reason the High Street died

In the UK the major shopping district is colloquially called ‘the high street’. Other countries may call it the CBD (central business district – but more generally this is the office and skyscraper part of a city), downtown, or simply ‘the shops’. My local town here in the UK has one named The High Street and this isn’t unusual for England as it is the most common street name. With the advent of online shopping in the early 2000’s and the rise of Amazon there was much consternation at the plight of bricks-and-mortar shops on the high street. TV programmes that aimed to remedy the flight away (notably ones featuring Mary Portas – ‘queen of shops!’) were common, there were government grants and industry worked with academia to study the issues – I know, because in my professional life I took part in one such study.

But the shoppers continued to flock to the online retailers and everyone was puzzled. Discounts, robo-shoppers (research online, shop in store without browsing), price matching and all manner of techniques were put forward. Card networks offered to analyse patterns and events were held in target towns. Yet, from my personal and anecdotal experience I’d have to point at one major reason why people are turning away from shopping in person especially at the larger out-of-town warehouses.

Rudeness.

I’ve just come back from picking up some items from one of the large chain store brands here in the UK and my experience was infuriating. I struggled to the checkout with a large TV and no-one offered to help, whilst the store was mainly empty with assistants wandering the aisles. We had a gaming console plus assorted other items and our purchases were a sizeable part of £1000 – so not insignificant. At the checkout the assistant immediately started up-selling product insurance and when I declined insisted on asking why? He also wanted to know my street address and email, and when I also refused those insisted that the purchase would not go through without them. Actually, the store already had them as I have an account in their online shopping system and had reserved the console earlier. But what shook me was the general abusive approach taken to the sale; countering my every decline, challenging my refusal to take insurance, insisting on more personal detail and so on. As we struggled to lift the items from the counter he stepped back and turned away – not even offering to hold them while I took some to the car. Perhaps it was just me, or a latent racism on their behalf – but this retailer as a whole has a ‘bad’ rating on Trustpilot with five-figure negative ratings. I felt unwanted and used.

Recently another large out-of-town shopping warehouse has gone bankrupt and when I read forums on Toys-R-Us and their decline many people mentioned the shambolic store layouts and disinterested assistants. If shopping is all about experience, as many retail consultants believe, then it is important that shoppers feel great about what happens to them, not abused. I’ve spent long enough in the cut and thrust world of business and even time in retail as a IT consultant, so I understand the pressures and analytics which drive certain behaviours. Scanning time for checkout operators, forced meet-and-greet, up-sell and cross-sell all sound good on PowerPoint but in reality shoppers are looking to feel good and have an enjoyable experience, not just acquire goods out of necessity.

I’d have to identify rudeness as a major reason why the in-store experience puts off many shoppers in England in the larger chain stores. Contrast this to a recent bookstore – surely an endangered breed if ever there was! – and the utterly other experience of an assistant looking people in the eye, asking how they were and did they enjoy that type of genre, wishing them well with their purchases and offering to go the extra mile and lookup stock if needed. You felt warm and appreciated and even though I seldom purchase physical books now, I have repeatedly gone to that store simply to browse. I felt good, I felt human, I felt wanted.