I came across a project once David Jones uCurrent . All in all, it is a very simple system. Voltage is deposited on the measuring resistor, which is then amplified x100 and fed to the output. Unfortunately, the item is not cheap, about 70 EUR excluding shipping costs. I decided to make my version, slimmer, cheaper, but with similar (or even...[Read more]

Hi! I wanted to share with you the description of the construction that my life forced me to make. I had some periodic heart problems and every time I got Holter it all calmed down ;) If any of you have ever tried to sign up for Holter, you know that it is not easy. He waits and waits. I decided to take matters into my own hands and build...[Read more]

Hello colleagues. I haven't published anything for a long time. I spend more time on mechanics in the workshop. Milling machine, lathe. Today, a simple meter, a Zener diode voltage measuring instrument. Diagram from the Russian-speaking forum. Both the simple diagram and the execution of the device. Three ready-made modules for a few zlotys...[Read more]

About three months ago a friend asked me if I would build a magnetic polisher for his friend jeweler. I asked what is it what is it? A longer discussion developed here, an exchange of a few e-mails / sms with links and I already more or less knew what a machine it was. The general principle of operation is simple. We have a spinning "plate"...[Read more]

Power indicator two channels 120 led KA2281 2 × 5-channel LED level meter for stereo tape recorders and home stereo This is an integrated circuit consisting of a 2-channel LED level meter driver, designed for use in systems. Can be configured as two channels and one channel. Features of the KA2281 Comparator AC level (-16, -11, -6, -3, 0d13)...[Read more]

Since my girlfriend is a flower freak, she marked something to stick in the ground, forget about the fact that it is in the ground for a few months and in the meantime find out about how much water is in the ground (aka "when it's best to water" ), preferably via WiFi. With WiFi, nothing came out, because in total everything that uses...[Read more]

The project aimed to create control board for half-bridge topology with the possibility of setting the frequency using a computer program. Additionally, control board has synchronous sampling of the current waveform for accurate phase and amplitude measurements and plotting the graph of these parameters on a PC. This type of circuit is useful...[Read more]

Hello all. Some time ago I bought a LED current and voltage meter (4 bit, 0-100V, 0-10A) on the Chinese website. According to the description, it was to provide values with a frequency of 3 times per second. It turned out differently, i.e. he gave them less than once per second, which was unacceptable for my applications. The meter is built...[Read more]

The project was created at the request of my 8-year-old son - a fan of car driving simulators. Due to other responsibilities, it took me about 14 months. For construction, I used mainly what I had in the garage - eyelet plates for connecting wooden constructions are the foundation for mechanisms. The fi8mm roller comes from an old printer....[Read more]

Assumption Half bridge LC resonant with parallel load to C topology. I don't know why but we can find information about it as "parallel resonant converter" that I think is not a true (where is parallel resonant here?) Supply voltage = 230 AC ≈ 325DC lowest frequncy = 100kHz higest current on primary winding = 800mA output voltage ≈...[Read more]

I haven't posted anything on the forum yet, so it's time to show something. I present for a quickly built welding cart. Construction made of 18x30x2 sections. Reinforcements for shelves - 20x4 flat bar. Shelves made of 18mm OSB. Front wheels - swivel 75mm with brake. Rear wheels - 220mm pumped on 20mm axle. Additionally, a triple...[Read more]

Hello, as Christmas is fast approaching, I would like to present you an egg printer (in the sense of Easter eggs :wink: ) that I recently launched. This is one of those unnecessary projects, but that's where fun counts :D I designed all the necessary elements of the structure in SketchUp and printed it on a 3d printer. Green from ABS,...[Read more]

This time I present a retro-emulator on the Anlogic Chinese FPGA. The emulator has 8MB of 32-bit SDRAM embedded in FPGA. For communication with the keyboard, mouse, pad ... corresponds to the JDY-08 wireless module on the CC2541 chip which I programmed my own FW. FPGA configurations are loaded with 16MB flash on the board. The SD card is...[Read more]

Hello I present my next CNC milling machine which I have not finished long ago. The purpose is mainly: milling, engraving, cutting in materials such as: - wood - mdf - plexiglass The main assumptions are: a large working field combined with the stiffness of the structure and good material processing parameters. and it happened, the working...[Read more]

Hello to all forum members! Today I would like to present a project that was created out of pure boredom now, because I felt a bit sick ;) Seriously, I have the Multidiag Pro + diagnostic interface with slight modifications, and I wanted to see how it works, what it sends, and what are the voltages of these signals. I must admit that recently...[Read more]

When the capacity of the USB stick attached to the tuner ceased to be enough for me, I connected an old 2.5 "disk. When it was too small, I connected a 3.5" HD disk. There is a power problem. The power supply and disk had to work all the time when I set to record my favorite program. Almost every tuner has a SCART output, on which pin 8 informs...[Read more]

Hello everyone. Today I would like to present to you a project which, as it were, arose from the urgent need to defend against a neighbor, or rather against his onerous smoke from his chimney. Apart from the fact that my neighbor did not want to talk to me in any diplomatic way, he only poisons me and my family with this throat-biting smoke....[Read more]

Several days before my wedding I came up with an idea to rent a photo booth for a wedding party. When I saw what the rental prices are, I quickly decided that I would do my own, because the cost of building it was close to the cost of renting a photo booth for 2-3 hours. By the way, I recorded some material for my YT channel ( JestemInzynieremPL...[Read more]

Hello, I wanted to present one more project using an ATX power supply and in my case AT. I made him a battery charger. Li-ion up to and including 5S. I looked at Interk a little and did not find anything similar, so I think it is my project, so to speak. I used it to automatically turn on the fan so that it does not make unnecessary noise,...[Read more]

What is it and how did it start Recently I did an alarm with a gsm notification. But the alarm itself communicated with the phone via a serial connector, providing number identification and specific information sent by SMS. However, in many cases, the details of motion detection are irrelevant. It is important that we get an immediate notification...[Read more]

The author of the following project, having no experience with Raspberry Pi, set about creating a simple air conditioning control system. As he did very well, he decided to create the following guide so that any other person could also build a similar device. Step 1: What you'll need To compile the system described below we need: * Raspberry...[Read more]

In the material below, the author describes how to use Arduino and an RFID reader to build a simple lock. In this system, Arduino reads the RFID tag ID with the help of a special reader. The identifier is displayed on the OLED screen, and if it matches the number stored in the system's memory, it displays the word "Unlocked", it can also...[Read more]

The project below is a weather station based on a module with ESP8266. There would be nothing special about it that distinguishes it from other such constructions, if not for the optimization of the system in terms of minimizing power consumption. The microcontroller used is not very energy-efficient, so it works on average in battery-powered...[Read more]

Currently, in the era of simple and inexpensive GSM modules and Arduino modules, it is very easy to construct an SMS-controlled relay. In the project below, the author used the SIM800L module to receive SMS messages. The whole system is controlled by the Arduino Nano V3 module. The system is equipped with one relay, which is controlled by...[Read more]

Thermal imagers have been fascinating for years. The idea that you can watch images in a part of the spectrum of electromagnetic radiation, inaccessible to our eyes on a daily basis, is extremely interesting and appealing. Unfortunately, the implementation of this task is not cheap - especially if we want to buy this type of camera only to...[Read more]

Microchip ATM90E26 is an integrated circuit dedicated to use in modern power consumption monitoring systems. It allows for easy integration with advanced monitoring systems of the power network within, e.g. our home. The use of such a system together with, for example, photovoltaic systems allows you to monitor the level of generated energy,...[Read more]

Most computer platforms have the ability to connect sensors that operate in the audio band (microphones) or in the visible light (e.g. cameras). However, sensors for electromagnetic radiation in the radio range are not popular and until recently it was difficult to connect to computers systems allowing for any collection of radio waves. In...[Read more]

In Brazil, the Raspberry Pi Zero overclocking record has just been set. The team managed to achieve a clock frequency of 1600 MHz and test such an extremely overclocked computer. This gave them the first place in April in the HWBOT ranking for SoC BCM2835, which is in RPi Zero. The whole overclocking began with one teaser on social networks,...[Read more]

The description below shows how you can convert a Raspberry Pi with a GSM modem to USB into a gateway for sending SMS via the web interface. The project was created using PHP and C #. The software that communicates with the modem is written in C #, and the web front-end in PHP. In addition, the system is equipped with a PostgreSQL database,...[Read more]

The environment monitoring system, based on the LoRa IoT interface, consists of a base station built using the Arduino Mega module with a LoRa gateway and remote stations based on the Arduino Feather, which connect to the base station via the LoRa radio interface. The system allows monitoring of environmental parameters in the house and its...[Read more]

Pi-FM-RDS is an FM radio transmitter equipped with RDS, running on Raspberry Pi. The GirHub downloadable program is responsible for generating a frequency modulated (FM) waveform with encoded RDS data (data transmission system with audio transmission). All this works in real time and is able to work with both mono and stereo audio signals....[Read more]

The electronic fuse eliminates the need to replace the element that burns out with excessive current when using a classic fuse, e.g. a fuse. This element does not act as a current limiter in any way - when it rises above the set limit, the system disconnects the circuit. The limiter would instead limit the flowing current to a predetermined...[Read more]

This simple device has one task - it converts received exiles, broadcast in a walrus alphabet, to Latin letters. This translator can find many applications. With it, you can train your morse broadcasting skills, but also decode data received from the ether. It may be amazing, but the walrus alphabet is still very popular in amateur radio,...[Read more]

Hello. I am honored to present my present work committed in 15 minutes during the performance of works at the end of the world, i.e. in Central Poland. Needed was a flow meter with pulse output to control the chemistry dosing pump. Of course, there are ready-made flow meters / water meters with such a function, only that within a radius of...[Read more]

Hello. I would like to present an electro-spindle made by me from a 2.2kW 2800rpm "dachshund" type engine. The design was created for use in a small universal milling machine for machining aluminum and steel. I decided on my own design, because within the budget I would have to choose a liquid-cooled Chinese reaching 25 thousand rpm, but...[Read more]

Hello, I wanted to present a simple and proven (using the GLUCOFACTS Deluxe v3.05 program) cable to read data from the Bayer Contour TS glucometer.   Of course, there is nothing extraordinary here, and his advantage lies in simplicity. For anyone who needs to archive measurements from time to time and has a computer with an RS-232 port, it...[Read more]

Recently, I found an offer to sell a COB LED module with a power of 50W. I decided to check whether the given parameters really correspond to reality - below I put the results of my test. 50W COB LED module purchase I found the diode on eBay under the slogan 50W LED Chip COB 30V-36V Cool white Integrated Bright Bulb beads for Floodlight for...[Read more]

Recently, a remote-controlled 230V socket stopped working for me. The relay did not respond to commands sent from the 433MHz radio remote control. Such simple devices use a transformerless power supply, I suspected a short circuit on the zener diode, the reason was damage to the foil capacitor MKP X2 330nF. The capacitor lost its original...[Read more]

Arduino NANO 33 IoT is a new version of the NANO module with 3.3V logic levels (note the extension modules with 5V I/O), ARM microcontroller SAMD21G18A , WiFi and Bluetooth connectivity NINA W102 , and 6-axis IMU LSM6DS3 . The PCB has a secure key storage ATECC608A used in secure communication with the Arduino IoT cloud. The board allows...[Read more]

New Arduino board NANO Every uses a microcontroller ATMega4809 AVR, compared to the previous version nano where it was used ATmega328 . On the Every version PCB you won't find a quartz resonator, due to the clock signal generator built into the microcontroller up to 20MHz. We get more flash memory - 48KB, more RAM - 6KB, and less EEPROM -...[Read more]

1. Magnetic field in matter The magnetic field in a vacuum depends only on the electrical circuits that generate it. In material environments, there is also the influence of molecular currents in particles of matter. An electron moving around the nucleus at the angular velocity omega_zero in an orbit with radius r represents an elementary...[Read more]

Architecture RISC-V has already discussed on elektroda.pl, a set SiPEED MAiX DOCK in the price of $ 19.90, it is based on the SiPEED M1W module containing the K210 dual-core CPU in RISC-V architecture, KPU (support for artificial neural networks) and WiFi 2.4GHz connectivity (previous version M1 needed an external WiFi module, e.g. ESP8266)....[Read more]

1. Introduction Flyback converter is a buck-boost converter. It is one of the most popular topologies used to power devices with low power, has gained popularity thanks to its simple design and simple principle of operation. Many companies have added their solutions, improving some parameters; dynamic losses on the key were reduced, interference...[Read more]

Panel meter of power consumption / consumption of electricity type P06S-20 and P06S-100 I received the above two power / energy meters for testing. They are identical in appearance, the only difference is the transformer attached to the stronger version. The dimensions of the module are 85x47 mm (part recessed into the housing), depth: 24...[Read more]

It took me a little bit, but as promised, I am presenting you a "Chinese" branded meter UNI-T though I don't know how much truth there is :D . This multimeter is available in several versions (from AND down E. ) that differ in their functions. I have purchased UT210E , because I was interested in the small range of the measured current...[Read more]

Recently, a few people from our forum ordered the UNI-T UT33 multimeter, which I learned from the thread Gadgetomania - gadgets Electrodes for points . As literally a few days earlier I got such a multimeter (version with the letter "B" at the end) from a friend, because he was in arrears, and he himself had no idea how to use such a contraption,...[Read more]

The inspiration for today's article was a colleague @kkknc who in the thread dedicated to gadgets that may appear in the Electrode shop , he proposed two interesting devices, and I quote: "Cheap and interesting. 1Hz-150KHz 3.3V-30V PWM Board Pulse Signal Generator Module PWM Frequency Cycle Operation adjustable Module LCD Display And the...[Read more]

The Arduino Mega (ATmega2560) + ESP8266 module on one board contains Arduino Mega and a WiFi module based on ESP8266 with a printed antenna and an external uFL antenna connector. The cost of the module on auction portals is ~ $ 12 Link . The module can be powered from a micro USB socket or DC 7-16V connector, there is a DC / DC converter...[Read more]

Today I will present you a very interesting microscope equipped with its own LCD screen (because it does not look like OLED or even IPS). I got the device for testing from one of our forum colleagues - @Bestler Thank you very much, and sorry for "messing" ... But to the point. The microscope can be purchased from our friends from the east,...[Read more]

The laser SDS011 sensor from Nova Fitness is available on auction portals for ~ $ 20 SDS011 . The device has an air inlet and an air suction turbine. 5V power supply, UART communication interface works with 3.3V voltage level. Information about PM2.5 and PM10 dust measurements is available as incoming data via UART interface or as variable...[Read more]

Arduino UNO + ESP8266 module on one board contains UNO based on ATmega328 and WiFi module based on ESP8266. The cost of the module on auction portals is ~ $ 7 Link . The module can be powered from a micro USB socket or DC 7-12V connector. Communication with the modules takes place via the USB UART converter based on the CH340 chip. Arduino...[Read more]

The Piri company provided us for testing remote controlled socket WiFi 2.4GHz which measure the power consumed by the connected device. In the video you will find the results of the socket tests, we will also look inside the housing. Control of switching on the connected device and reading of power consumption is possible thanks to the smartphone...[Read more]

Today I would like to present a brief comparison of the two NEO-6M GPS modules. The difference between these modules is the use of a different PCB and a different antenna. The described modules in the pictures below. Older version on the left, newer on the right. I described the first of them some time ago. You can find this description at...[Read more]

The Piri company provided us for testing WiFi 2.4GHz wireless camera reolink argus 2 . The term "wireless" is of key importance here, because the camera, apart from WiFi connectivity, is powered by a battery (5200mAh 3.6V) and can draw energy from a photovoltaic panel. In the video below, we look inside the housing and test the capabilities...[Read more]

Today I want to present an interesting (in my opinion) artificial load working in CC mode, in which a test of fast charging modes can be forced from the menu. What is useful for testing chargers and powerbanks with this option. The heart of the device is the MOSFET IRFZ44N. Looking at the parameters of this transistor, the manufacturer conservatively...[Read more]

When testing, for example, power supplies, an electronic load is useful to, for example, force the flow of a specific current. In practice, light bulbs are often used quickly (which is a bad solution due to the low resistance of the cold fiber), resistors, or a random transistor on the heatsink, the base or gate of the transistor is controlled...[Read more]