voltlog – Page 6

Ynvisible Ultra Low-Power Display Technology – Voltlog #375

Welcome to a new Voltlog, today we are taking a look at some pretty interesting display technology, this evaluation kit was sent to me by the company named YNVISIBLE for the purpose of this review, they developed this display technology based on Electrochromism, this is defined as the property of a material to change color when voltage is applied. I’m sure this sounds familiar because similar properties of materials are used in e-paper or e-ink displays, they both reflect ambient light but in the case of e-ink the technology is different , as e-ink display are based on electrophoretic properties.

So this is what you get inside the kit, I like how it’s put together and you can get started evaluating the technology as soon as you open the box because, besides providing you with a wide selection of display examples based on their technology, you also get some ready to go boards to drive these display units.

Before telling you more about the display technology let me quickly connect one of these to the demo board to show you how it looks. I noticed two things immediately, it does take some time for the cells to change color but it’s really simple to drive these as you can connect them directly to MCU pins and just drive them directly. For example this 3 segment display, has a 4 pin connection, one common pin and one connection for each segment. Drive it high or low to go from color to bleach state. So you start to imagine how this can enable some very low cost devices to be built.

Aneng AN888S Multimeter With Bluetooth Speaker Review & Teardown – Voltlog #374

Welcome to a new Voltlog, today we are taking a look at this true RMS auto-ranging bench multimeter unit from Aneng but as we know we typically find the Aneng meters being sold under other names, different colors so for example this one is also available under the model name ZT-5566 and ZT-5566SE which I’m not really sure but might be able to provide spoken measurement via it’s built-in speaker while the one I have here only has bluetooth speaker functionality. Yup you’ve heard that right, it’s a multimeter combined with a bluetooth speaker. This unit was provided for free by banggood.com for the purpose of this review and if you would like to order one after watching this video, please consider using the link I’ve placed in the description of the video.

This is a 20000 count meter and the dc voltage accuracy is 0.05%+3 counts, dc current 0,5%+3 counts, an update rate of 3 measurements per second, it can also do ohms, capacitance, diode, continuity, frequency, duty cycle. There is no CAT safety rating printed on this meter, they probably don’t bother with that any more but we should be able to evaluate general safety measures later in our teardown. I don’t see myself playing music through this while working on my projects but I could definitely see myself playing one of my favorite podcasts while working on some electronics, like for example TheAmpHour show which I often listen to while assembling or debugging boards.

InTheMail | Voltlog #373

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. And I have some news regarding the import of our packages from aliexpress into the EU. As you may have noticed Aliexpress started collecting VAT according to the new IOSS system and you would expect that an EU member country would have the system in place to process these packages because you know they asked for this system, they created it so you would expect the would have the system ready.

But it’s a complete shit show over here, there is a double taxation happening, the Postal company here slaps a 1.6 EUR fee for processing packages and also collects VAT according to the value declared by the sender on the package, even though you already paid VAT and you can prove you paid it with the invoice that Aliexpress provides.

When asked why we have to pay the VAT twice, the Postal service said, they have the system in place to process packages coming through the IOSS system automatically and avoid double taxation but the customs authority doesn’t have it’s system ready, hence the issue of double taxation. And you can guess what the customs authority said when I asked them why we are being taxed twice, they said, it’s all good, we shouldn’t be taxed because tax has been collected already and yet the postal service is not releasing the packages until the fees are paid.

It seems that right now, the only way to avoid double taxation is if you do the import papers yourself or if you use a 3rd party company that offers those services but their fees start at about 50EUR per import and the forms aren’t exactly easy to do so yeah, cheapest option right now is to just pay the postal service fees and get the packages. I’ll share some more info once I have it but right now, at least here in Romania, it’s as bad as it can be and the authorities don’t seem to have a solution. But enough ranting, let’s get on with the items I received.

Uni-T UT501A Insulation Tester Review & Teardown – Voltlog #372

Welcome to a new Voltlog, for today I’m going to review & teardown this Uni-T Insulation Tester, the model number is UT501A. We’re going to start with a general introduction and then continue with a teardown and presenting some real world test scenarios. If at any point you are interested in ordering one, please check out the links I’ve placed in the description below.

So, like the name implies, this meter is good for testing insulation resistance but why would you need to do that? Well you would want to test the insulation resistance of a particular circuit or piece of machinery immediately after first installation or repair or through its service life to discover potential problems before they occur.

Let’s take for example the winding of a motor, every turn of copper wire is insulated but because of stress, harsh operating environment, over time, the insulation might start to fail and by testing regularly you can start to nice if the insulation resistance starts to drop and you might be able to service that piece of equipment before catastrophic failure.

Or another good example is when you wire up the electrical installation for a new home. During the installation procedure or during the construction period, accidental damage might occur to the wiring so it’s good practice to test for insulation resistance before you start using the new installation.

Pokit Meter Review – Voltlog #371

This is a bluetooth pocket multimeter which means it doesn’t have a display, it uses a smartphone/tablet app to display the measured data and it can do almost everything that a basic meter does: it can measure ac/dc voltage but no true RMS capability on this model, ac/dc current, resistance, continuity, diodes and as a bonus it can also do data logging and it has an oscilloscope mode but with a more limited range of values & functionality given its size. I find this pretty cool, because they managed to build so many functions inside such a small package like I have not seen pocket multimeters that can do data logging so far.

Right from the start you realize why they call it a pokit meter, it’s basically the size of a small puck, less than 5cm in diameter and about 17mm thick. Inside the box you get the meter itself, a pair of J-clips, a spare fuse, a small neoprene carry case and a quick starting guide. The first thing you need to do is to remove the battery seal and you have to twist the battery cap for release and then pull on the small insulating paper which then activates the CR2032 battery.

Start Hacking The CAN Bus With The ESP32 CanLite Board – Voltlog #370

Welcome to a new Voltlog project video, today I’m gonna be presenting this little guy called ESP32 CanLite. This is a CAN hacking / development board based on an ESP32 and this is the results of my adventures into hacking the CAN network on my vw golf. I have not made any significant progress on the actual task of hacking the can bus other than what’s shown in Voltlog #342 simply because I got very busy with the professional work I do, consulting for various clients, you know just designing and building electronics but nonetheless I found the time to design and refine this board because this is already the second revision.

InTheMail | Voltlog #369

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time and I must say that I’m worried about the future of mailbag videos given the new EU regulations on imports from China which are going into effect starting 1st of July here in Romania, I’ll have to do a separate rant video on the subject but there might not be any mailbag videos going forward.

I’m gonna start with this mailbag with a brand that you are already familiar with here on the channel, it’s difficult for me to pronounce this, I don’t know how it should be pronounced but these guys make affordable adhesives and related products. I haven’t had this one before, it’s the first time I’m getting the Kafuter K-5203 which is a thermal adhesive and to be more specific, their description is reinforced thermally conductive silicone elastomer with great adhesion, insulation and dissipation. And to give you some numbers they claim it can withstand variations of temperature between -60°c and +280°c and it has a shear strength of 30kg/cm3. The thermal conductivity is 1.2 watts per meter kelvin. I don’t need to tell you how to use this, it’s good for attaching stuff to a heatsink, in general stuff that also needs some form of bonding to the heatsink.

I Made A 10 Channel Thermocouple Data Logger – Voltlog #368

The idea for this project started when I got the T-962 reflow oven, after running a few tests I discovered that it had some hot-spots which meant some areas inside the oven were hotter than others and this could lead to trouble, you could get melted connectors in some places and cold joints in other places. Now it’s hard to tell how bad the situation is without doing some measurements so I decided to design & build this board which is capable of reading 10 thermocouples and logging the data. This way I could place the thermocouples inside the oven, something like a 3×3 or 4x2x2 matrix and I could get a sense of what’s going on inside the oven.

New Lab, New Voltlog Electronics Workbench | Voltlog #367

The most important part of this lab is obviously the workbench and this is something that I designed myself, I guess I can call this the Voltlog Workbench Design, it’s 2m wide with 80cm deep. The working surface comes out at about 95 cm from the floor. It sits on these adjustable feet but I haven’t even leveled it so far. Thanks to my friends at Welectron.com my working surface is protected with these nice premium ESD Mats. They are 100% and phthalates free, no bad smell, Heat and solder resistant, Chemical resistant, two layer ESD bottom side is conductive, top side is dissipative and they have this nice anti-reflective surface finish which is very comfortable to work on. I went with gray because it works best as a background for video shooting but you can opt for Blue as well. I’ll put a link to these in the description below, I highly recommend Welectron for their services & customer care and I highly recommend these ESD mats they are top quality.

InTheMail | Voltlog #366

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. I’m gonna start with this EVA hard carry case, it has a rather strange shape but, this will fit one of these budget label printers perfectly. And if you are like me, using the label printer in the lab, where everything is clean, it might be perfectly fine to just keep it in a drawer but at some point a friend asked for my help to figure out the networking wires in a building, basically to identify every wire, crimp it and install some networking gear. Well when you start doing stuff like that you need a carry case for your label printer because it’s gonna get dirty, there will be dust and grime and the LCD might get scratched, you might want to toss this into your tools bag so that’s when I decided to order one of these hard carry cases, they’re fairly inexpensive so well worth getting one.A higher price printer might get one by default from the manufacturer but for these discount $30 printers you can’t really expect to get one from the manufacturer so you need to order it separately.