Arduino Mailbag – VoltLog

InTheMail | Voltlog #337

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different items received in this mailbag, I’m gonna start with this USB to RS232 serial adapter cable, inside this uses the famous Prolific PL2303 chipset and there is nothing wrong with that chipset but many people have had problems with that, including myself. Those problems are mostly related to fake chips, because going on Aliexpress and purchasing the cheapest usb to serial port cable adapter you can find will most certainly ensure you get a fake chip. Better cables that use genuine chips from prolific like this Ugreen branded one are more expensive but it should pay for itself in the long run by providing reliable connections when you need them.

I like this particular model also because it comes in a 2m length because sometimes you would use a cable like this to connect some large piece of gear and it might be helpful to have this 2m length of cable up to your computer.

InTheMail | Voltlog #336

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different items received in this mailbag, I’m gonna start with this little guy, it’s a pulse oximeter. The model number, at least on the packaging, is YK-82C with a pretty recent date code as well, September 2020. So I got this pulse oximeter to keep around cause during these times, I think it’s a good idea to have such a device to monitor the level of oxygen in your blood, you know just in case you have an unfortunate event with well you know what, let’s not name it. I think this particular model is pretty nice, they also include an EVA carry case. It doesn’t come loaded with batteries but it uses 2 x AAA batteries which is nice. Single press to turn it on, it will auto power-off if there is no finger present for taking measurements, that’s pretty nice. Short press of the switch will cycle through a few different display modes in a couple of orientations, as we can see it uses one of those popular two color OLED displays.

InTheMail | Voltlog #334

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different items received in this mailbag, I’m gonna start with this rather big development board based on an STM32F407 microcontroller. This particular microcontroller has 512K of flash memory and 192K of ram which should be enough to cover most needs. What I liked about this development board is that it comes loaded with peripheral interfaces like CAN bus, RS232, RS485, Ethernet, USB, SD Card and a bunch of IO so you can pretty much build any project you can think of. I’m particularly interested in the CAN interfaces so I’m planning to have a play with those.

While the product might be available from different sellers at different prices, there might even be different variations of this board I will place a link in the description to the seller where I got mine because it was the only one that offered a support pack for the board which contains schematics, documentation, example code, it even contains like a bundle of keil compiler with a keygen which ofcourse I’m not going to use, that would be illegal but you get the point, the seller will offer you a download link for this pack which is like 1.7Gb worth of documentation so I highly recommend it. It also ships the boards in these cheap plastic carry cases which are great for protection during transport as well as storage afterwards.

InTheMail | Voltlog #329

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different items received in this mailbag, I’m gonna start with these quick connectors, these are a 2 input to 4 output type and they can be useful if you want to split a two wire pair, into multiple pairs and have those connected without having to solder wires or twist them together. They are rated for 600V 32A and can take a wire with a diameter between 0.08 and 4mm but as always take these specs with a grain of salt and don’t push them to their limit if you want to stay on the safe side. What I like is that they also have a couple of mounting holes so you could attach these to a panel.

Unexpected InTheMail | Voltlog #325

Welcome to this impromptu video, as you can tell I am not in the lab, I’m actually taking a hike in the beautiful Carpathian mountains in a remote area which is actually bear territory so I need to be careful but here is what I found in my path this looks like an esd bag which two lcd panels inside.

As you may know, due to travel restrictions this spring I was not able to do the electronics components harvest in the outdoors which is a bummer, but finding stuff like this certainly makes me happy, this could make our friend Marco Reps jealous as he usually finds just capacitors in the German fields.

So these look like a couple of 2.0 inch panels let’s see what we got here, they are based on the ST7789V driver, 240*320 resolution, IPS panel with a 12 pin, solderable type FPC connection. I mentioned this before, I am working on a replacement open source control panel for the Gophert NPS1601 and this is one of the options I was considering a few months ago when I ordered these.

InTheMail | Voltlog #324

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different items received in this mailbag, I’m gonna start with this set of replacement cassette tapes for my label printer. You’ve seen me order these before but now I got some different variations which I thought would be interesting to try: I have Black on clear which would be nice for sticking on a white surface and have only the black text visible. I have some standard black on white cause I use that everywhere, this is white on clear tape which would be good for sticking on a black surface to have just the white text visible, white on black which could be general purpose or for sticking on dark surfaces and one that seemed very interesting security tape black on white so I’m guessing this could be used like a seal?

InTheMail | Voltlog #321

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different items received in this mailbag, I’m gonna start with this GPS module, the model number for this is ZX612 and it’s part of the Chinese gps trackers family, I think it uses a similar protocol to the relay gps tracker that I showed in a previous video and possibly connect to the same Chinese web server for data collection which poses the usual privacy risks but as I’ve shown in Voltlog #274, using a raspberry pi you can setup your own gps tracking server.

InTheMail | Voltlog #317

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different electronics related items in this mailbag video and I’m going to start with this 2.2 inch TFT panel which I got for the Gopher NPS1601 project, as you may know I am working together with other people to produce an open-source plug&play replacement control panel. This is a bit of a spoiler but something like this 2.2 inch panel is an option we are considering with the biggest decision factor being available space on the front panel, as you know the NPS1601 has quite a compact form factor and there are other things that need to fit in there like rotary encoders and output jacks.

This particular panel has the ILI9225 driver IC and apparently 176×220 pixels resolution. When I ordered this it was labeled differently with ILI9341 and 240×320 resolution so they must have made a mistake when shipping this to me. After a bit of googling, it appears there are indeed two variants of this module floating around, they look almost identical, same form factor but use different lcd panels. This is one of those situations where Murphy got me right when I needed to get this part faster and couldn’t wait for anymore delays. Luckily I have another order placed a few weeks after this one so I’ll wait and see how that one shows up.

InTheMail | Voltlog #311

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different items in this mailbag video and before we get started I would like to mention that packages started flowing in around 1st of May and things are moving, certainly not as before but there is some movement at least and I hope you guys are benefiting from the same improvement where you are located.

I’m gonna start with this multi-functional charger from LiitoKala, it’s model number Lii-402 and I actually have another one of their chargers but it’s the model with an LCD. I’ve been using that one for the past few years, it’s been working great but I needed a second one to increase the number of cells I can charge at the same time. I picked a simpler model this time, with just some LED indicators, it’s good enough for me, I mostly just plug in the cells and let them sit in there for a few hours before I return and take them out so I don’t usually check the information on that screen anyway.

This model takes a micro usb input 5V 2A so those 10W can then be distributed as mentioned on the packaging, 0.5A times 4 or something in between if you charge less cells at the same time. It can charge Ni-MH, Li-ion, Li-Fe and the battery slots are universal, they can hold a bunch of different types of cells so it’s a pretty useful charger to have. I got this one from banggood because it was in the EU warehouse but you can probably get it cheaper if you are willing to wait 1-2 months for delivery from China.

InTheMail | Voltlog #304

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. We have a selection of different items in this mailbag video and before we get started I would like to mention that during the past 3-4 weeks packages have almost stopped arriving here in Romania. I’ve been getting maybe 1 or 2 delivered per week. Even packages from Germany have been sitting for weeks before moving between warehouses so I was wondering how things are going where you guys are living? Let me know in the comments below. Hopefully things will get better as many countries are trying to restart the economy in May.

The first item is one you’ve seen before on this channel, it’s a 7 inch magic arm clone from China. The original magic arm from manfrotto is about 100 EUR and there is no doubts it’s better built, but I need a few of these to hold various stuff around the workbench, LED lights, to hold the phone in front of various instrument panels and it would add up quickly if I were to get the original.

These replicas from China are good enough for what I’m doing, they’re inexpensive and if you are curious how these work, Bigclive did a video recently, he showed how one of these works inside so check out his video if you are curious about that. The nice thing is that you have a single knob that you need to turn to lock or release the whole system and you can find these in a variety of sizes.