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]

Hi! Another project for my workshop equipment is MPCNC, i.e. a CNC milling machine printed on a 3D printer, today I will share my humble opinion with you (no time for testing, session at PW :( ). I always wanted to be able to precisely cut elements in wood, plexiglass and aluminum. I couldn't afford ready-made milling machines, so I decided...[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]

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]

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]

Construction description The tester was created to learn how to draw patterns in Eagle and learn the basics of microprocessor programming. In addition, it is small in size. I used SMD components for the first time. Scheme: PCB view from EAGLE: Here are the pictures of the finished structure: To facilitate the exchange of the ZIF14 processor...[Read more]

Hello, The construction that I want to describe here is a modification of the existing solution, and the topic serves to convey the idea and provoke discussion about this solution. I have a CNC milling machine of my own design, in which the drive is transmitted using trapezoidal screws (a simple, popular and relatively cheap solution). In...[Read more]

Good morning, Today's presentation concerns my final version of an amateur oscilloscope and a generator based on an external USB sound card. Seemingly nothing special as for today's times, but the device is easy to install, inexpensive, and most importantly useful. Device parameters: OSCILLOSCOPE: Channels: 1 Vpp max: 25V R in:> 1M...[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]

Hello. Before buying, it is worth checking what version we are dealing with. The point is whether the version is original or not. If we have non-original versions, after the update you will see the message: This board is Fake!   This applies to the version with the serial number shown in the picture. Fortunately, there is an update that eliminates...[Read more]

Module WEMOS D1 mini Pro based on ESP8266EX . A detailed description of how to integrate the module with Arduino environment can be found in the materials describing the modules previously made available: Amica and D1 mini. In addition to the configuration of the environment, you will find examples of digital ( DS18B20 ), and analog ( TMP35...[Read more]

The tester automatically detects the type and layout of the lead leads of the connected component, and displays the measured parameters of the tested part. The tester is powered by 9V battery and during the measurement it draws current 12-15mA , while in sleep mode it draws current 20nA. Connect the test components to the three random (or...[Read more]

DRF1278F Dorji. The Dorji Company has made available to users of forum elektroda.pl free of charge DRF1278F modules samples based on Lora Semtech SX1278 . DRF1278F modules were tested based on documentation, manufacturer sample source code and tests performed on modules DRF4463F last year. Modules PCB have a small size, description of the...[Read more]

The Dorji Company has made available to users of forum elektroda.pl free of charge 20pcs DRF4463F modules based on Silicon Labs Si4463 . This article presents the results of external tests performed for elektroda.pl. As you can see modules have very small dimensions, but they have a lot of functionality. The module board is covered with a...[Read more]