I recently took part in a hackathon, where each team was given a DJI Tello drone for hacking. We had a lot of fun and I really liked this small, nimble drone, which could be flown inside and had a camera, which allowed you to stream video to your computer via WiFi (and then for … “Measuring thrust of cheap 1S coreless motors (for a possible ESP32 μdrone)”
Author: martin
How to panelize PCBs in Eagle
These days, you can get custom PCBs made really cheap – a few dollars for a couple of 100×100 mm boards, complete with silkscreen, vias, everything. But even with these low prices you might want to have a couple of smaller boards produced on one, larger board. Let’s clarify something first – I won’t be … “How to panelize PCBs in Eagle”
Nokia 5110 screen replacement
For the past couple of years, I’ve been using the Nokia 5110 84 x 48 px monochrome display for most of my projects. They are really cheap, small and easy to use while providing enought screen estate to display a couple of variables or sentences. But they have their downsides, the biggest being their terrible … “Nokia 5110 screen replacement”
3D printing a stencil for applying solder paste
If you ever tried making more than a couple of the same PCBs at once, you probably came to the conclusion that soldering it by hand sucks and also takes a lot of time. The alternative – which is also how they do it commercially – is the so called reflow soldering. Simply said, it … “3D printing a stencil for applying solder paste”
Quick Charge 3.0 circuit
Generally speaking, the USB interface is pretty complicated. This is also true if you want to charge or just deliver some power over USB – normally, USB-compatible devices will only dare to draw up to 500 mA, which isn’t much and it means a full charge would take hours. If you want to charge at, … “Quick Charge 3.0 circuit”
Testing the range of RA-01 (LoRa) modules and comparison against NRF24 and ESP-LR
Wireless communication is fascinating for me, but since I do not know much about RF electronics, I am stuck with what pre-made modules I can buy. And, of course, one of the most important parameters of a radio module is it’s range. But strangely, this information is very scarce on the internet and I don’t … “Testing the range of RA-01 (LoRa) modules and comparison against NRF24 and ESP-LR”
Update to my Brymen 867/869 interface cable
If you ever read any other articles on my blog, you know that most of them are about devices I’ve constructed and used for a while. So I do not publish immediately after I finish a construction, because I prefer to use the device for a while and then summarize my experience with using it … “Update to my Brymen 867/869 interface cable”
My Open Source Multimeter – final revision
So I finally arrived at the point where I consider my Open Source Multimeter finished. It is not perfect, but it is more than good enough for my purposes and I also do not have time to develop it any further (at least for now). So in this article, I’ll descibe what I came up … “My Open Source Multimeter – final revision”
AVR-based Li-Ion battery charger
If you ever worked with lithium batteries, you probably know the TP4056 – a chip for charging lithium batteries with CC-CV profile, two LEDs for state-of-charge indication, temperature input and so on. You can find it relatively cheaply on Ebay or similar sites, either as standalone IC or on a small and very practical breakout … “AVR-based Li-Ion battery charger”
STM32 Open Source multimeter – revision 1.4
I was hoping that this release of my multimeter project will be the final one. However, during testing, I still discovered things that needed changing or modifying, so in this article, I’ll at least describe some of the biggest changes and achievements of this revision & and also what went wrong and forced me to … “STM32 Open Source multimeter – revision 1.4”