Month: October 2021

Tasmota ESP32 Floor Heating Valve Controller | Voltlog 383

Welcome to a new project video, today I’m gonna be presenting this 10 channel valve actuator controller which I built with the purpose of individually controlling the water circuits on my floor heating system. The best part is that this is based on an ESP32, it’s TASMOTA compatible so it should be very easy for me to integrate this into my HomeAssistant smart home system.

So like I mentioned, the need for such a valve actuator circuit started when I installed floor heating into my apartment and if you ask why i didn’t use one of the commercially available options: I don’t like them, they’re expensive and they typically only work with their closed source ecosystem, I wanted something that runs open-source so I can control and customize various aspects.

I have a total of 9 circuits and these circuits have different lengths and the rooms have different sizes so putting the same volume of water through all circuits is going to result in uneven heating. This issue can be mitigated by tuning the individual flow valves on the intake of each circuit but that setting seems to vary with the pressure it gets from the pump and doesn’t allow a fine granular control over the temperature of that room which is what I want to achieve.

InTheMail | Voltlog #382

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. Here is an example of how I am getting most of my packages lately, they’re bundled like this and forwarded through the EU so they take a different route and don’t go through the normal customs import and taxation protocol and I’m fine with that because VAT has been paid at the sale point anyway there is no reason to pay any additional handling fee.

Let’s start with piercer probes and if you remember I have shown something similar in the past but they were  simple piercing needle probes, I have used those, they work both for piercing wiring for probing and also for inserting into female thin profile connectors. Now I got these which are a variation because they contain the same very sharp needle but I think these are nicer because they can also hold the wire you are probing and there is less of a risk of stabbing yourself in the finger as it was the case with the simple ones. On the back they have the same standard 4mm banana insert so you can hook these up with your standard 4mm test leads. I quite like them so they will be a nice addition to my box of probing accessories which is this one 

A Rant on Bad Datasheets | Voltlog 381

Welcome to this short video where I’m gonna rant about the quality of Chinese electronic component datasheets because for me it’s already the second time I’ve had trouble because of missing or incorrectly presented information.

Owon HDS242S Oscilloscope AWG Multimeter 3in1 Review & Teardown | Voltlog 380

Welcome to a new Voltlog, In this video we’re taking a look at the OWON HDS242S which is a dual channel 40MHz portable oscilloscope coupled with a 20000 count true RMS digital multimeter and an arbitrary waveform generator capable of 25Mhz sine and 5MHz square wave, all in this portable format with a 3.5inch color TFT display. As part of their line-up you can also get the HDS272S which bumps the oscilloscope up to 70Mhz.  You can also get these without the function generator option and those would not have the ending S in their model number.

I failed AGAIN at designing this FT232H circuit | Voltlog 379

This is my first attempt at designing with the FT232H and if you’re wondering how the FT232H is different from the standard FT232 or other typical usb serial converters, well it’s different because it has a thing called MPSSE which stands for Multi-Protocol Synchronous Serial Engine. This allows it to emulate a variety of serial protocols like: JTAG, I2C, SPI or general purpose bit-bang. So a couple of years ago I designed this breakout board and almost everything was right except for the fact that I got the usb data lines mixed, which prevented the chip from enumerating correctly on the USB bus.

So this year because I got a couple of FPGA boards I thought why not redesign that board to fix the data line issue and add a couple new features that would make it a very useful tool to have in the lab. And so I started designing this new board which I called VOLTAG and there a couple of things that I absolutely wanted to have: the first one was USB type C, I decided to only use USB Type-C sometime at the end of last year so every new board needs to be on USB type C, if it has a USB connection at all and the second thing I wanted to have was  the ability to level shift the JTAG signals.

InTheMail | Voltlog #378

Welcome to a new InTheMail, the series that will touch both your passion for electronics and your bank account at the same time. I have some news regarding the import of our packages from Aliexpress into the EU. It seems our Chinese friends re-grouped and found a way to improve things for us. So half of my packages are still coming  through as normal with quote marks, because I’m there is a double taxation happening, the electronic system is not operational here yet so they charge VAT a second time when you receive the package plus a 2 EUR handling fee but the other half o the packages started arriving grouped into larger bags through EU routes without having to go through customs. I think that’s a plus because it avoids the double taxation that was happening here plus I get more packages at once, less hassle. I’ll keep you updated in future videos on the status of these packages.

I built the ultimate electronics workbench using just a screwdriver | Voltlog 377

In this video I’m gonna show you how I built this awesome electronics workbench using just a screwdriver, yup, you’ve heard that right, you don’t need any other tools, just a screwdriver. In my opinion this is the ultimate electronics workbench, it has just the right height for me, it uses the available space as efficient as possible, it’s very strong and best of all it’s modular and upgradeable: meaning you will be able to grab this project and customize the size of the workbench to fit your available space or your particular needs. Oh and did I mention that it costs less than those commercially available off the shelf workbenches with similar specs? Stick with me in this video and I’ll share the full details on how I built mine.