Hello I would like to share with you a project that I did some time ago. In July, I bought an eclectic scooter in Lidl with a seat and a basket. I thought that it would be useful to do some security and ordered a GPS locator from the Majfrends. By the way, I thought about a phone charger, the more the phone holder is bought. This topic inspired...[Read more]

Smart home is becoming more and more common as technology advances, this article will focus on the security aspects of intelligent access control design. This article uses the STONE touch screen to send commands to the MCU to control the relay and MFRC522 module. Card reading principle: by running the RFID-RC522 module, identify the ID card...[Read more]

Let me present my own constructions of my own performance. I have presented them very briefly / roughly in another topic, not in this section, here they will probably be subject to professional evaluation / criticism. Maybe they will inspire someone, help someone, building prototypes is really difficult, but users of the DIY Constructions...[Read more]

The presented controller is used to convert the system with an OLED display to a color LCD display. The controller was built on the HK32F030MF4P6 microcontroller (they were cheap, I still have some left :) ) Source code in the attachment, so possible conversion to STM32F030 or other modifications should not be a problem. 1-bit color from...[Read more]

Hello Sometimes a man needs some unusual generator or quartz. You have to wait 2 days or 2 months for an order, and I am too stingy to buy a proprietary generator, so what? You have to do something yourself. For a long time I had an idea ... Something small, I set the frequencies and I forget. So I present the generator module project based...[Read more]

Hello. I will present here my own little project, the Fubarino-Eth board offering USB and Ethernet connectivity based on the 32-bit PIC32MX795F512H (512KB Flash, 128KB RAM) and the famous ENC28J60. This board is my version of the famous Fubarino-SD 1.5 from fubarino.org / schmalzhaus . I reworked this board a bit and prepared example projects...[Read more]

It's full of grilling time, and since I don't have a plot, and somehow not so much on the balcony, I have come up with my own little garden, so I sometimes decrease to the H0 scale 87 times. I present an electrostatic grass planter for mock-ups. If you prefer - a flocking machine for car upholstery. The generator is NE555, frequency around...[Read more]

Today I would like to present the old structure in a new version. In 2012 I built a hi-gain based on a Fender preamp and a modified Mesa DR (Hellstone?), Which I called Angels? Massacrator. It was built so that 6N2P and ECC83 lamps can be used at any position. Each base has a glow switch. Two EL84 / 6P14P can work at the end, but also Polish...[Read more]

I have a very useful device to present in the laboratory of dental prosthetics for the final processing of metal structures ("flash"). 3D printing made it possible to produce the most closely matched, necessary elements of a magnetic stirrer, adjustable rod clamps, ventilation ducts and a front panel frame inclined at an angle of 60 ° to...[Read more]

Admission Recently, an interesting console fell into my hands - Daryar DY-636N. I gave it the nickname "Mini NES" because at first glance it looks very similar to the original NES. Only a closer comparison reveals that it is slightly smaller and lower. Its extraordinary advantage is that it has two cartridge slots - a standard Pegasus 60...[Read more]

Hello Somehow recently after mounting to mine powerbank the Quick Charge module, I wanted a trigger for such devices. As I did not smile to spend PLN 40 on such a crap and I did not have more sense than the desire to have it, I decided to do something with the litter. There was another reason for self-construction - a lot of free time, because...[Read more]

Hello I present my headphone amplifier, which, according to the author of the project, is to operate in class A. The amplifier consists of three blocks: 1. Symmetrical power supply. 2. Headphone protection / Headphone switch-on delay. 3. Stereo power stage. The power supply is built around the LM723 (Motorola) chip and the LF357 fast operational...[Read more]

Hello. Recently, I got my hands on two dial indicators. I used two such systems to drive these indicators based on the LM358 integrated circuit. I made the pcb project in TraxMaker. The whole thing is placed in a plastic housing. Film_presentation:[Read more]

This mini-project is related to the previous one: This time I took a Maxim MAX16832 (V MAX = 65V) supplying the diode with a constant current up to 1000 mA. This chip is manufactured in a hobbyist-friendly SOIC-08 housing with an added thermal pad underneath, which allows it to better radiate heat to the surface of the heat sink. This chip,...[Read more]

Hello, This experimental project shows how to use ATtiny13 to sync live music and lights with just a few extra components. The design uses a single ADC (analog-to-digital converter) channel for signal acquisition and some DSP (digital signal processing) calculations that separate the three frequency bands in real time and make the LEDs dance...[Read more]

Some time ago I made a bicycle lamp powered by a bicycle hub dynamo. As such a dynamo in an unloaded state can generate definitely high voltages (up to 100V according to a German source), I was looking for a converter that can withstand high voltages. The choice fell on the chip from Maxim MAX16822 (V MAX = 65V) supplying the diode with a...[Read more]

Good morning I wanted to present my next watch project. I have been building watches for years and recently I realized that most of the pieces somehow fell apart and I have the last one left. This motivated me to try to rebuild my collection, hence this project. I called him Open Nixie. Firstly, because it has a modular design, so you do...[Read more]

Today I present a CNC machine - a plotter with a drag knife which I made for my own use (for my spouse). The spouse designs and cuts out decorations from paper. So far, he uses the Brother Scanncut plotter. The machine works quite well, although after cutting, I think that already thousands of decorations show some wear. In addition, it works...[Read more]

Hello colleagues. Using the TV in a dark room sometimes causes eye fatigue due to the brightness of the screen. This is no discovery - you can turn on the lamp and you're done. You can also turn on the LED strip on the back of the TV and turn it off when you are finished watching. However, it is always an additional activity. The project...[Read more]

Hello I would like to present my stereo tube amplifier, built on two PCL82 tubes. It is a very budget amplifier, the cost of production did not exceed around PLN 150. Let's start from the beginning. August 2020, Dominican fair in Gdañsk, while digging through the piles of antiques, I found two brand new PCL82 lamps, still in boxes. Lamps...[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]

Pigeon is a simple webcam, dedicated to work in the cloud. It is based on the Raspberry Pi Zero W, costing just $ 10. The minicomputer, together with the camera, are enclosed in a housing made in 3D printing technology. A simple handle is integrated with the housing, which allows it to be mounted anywhere, e.g. on the wall. The software itself,...[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]

The idea came from the fact that the 5-year-old daughter is willing to drive all kinds of vehicles. He packs on a motorcycle, he wants to drive the car, he stays in the tractor with his grandparents, etc. So I decided to build something for her that would allow to develop certain habits of the driver and provide a dose of adrenaline and child's...[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 a project done (almost a year ago) quickly in order to show the younger generation what can be done with the idea of some parts (the rest can be done). Hardware: Robot platform bought from China Adruino on the atmega 328 Double H-bridge controller for motor control Converter from 12V-> 5V for the webcam WiFi camera dcs-5222l Akku 11.1V...[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 would like to present the Bethlehem Star I made two years ago. The entire structure is made of sheet metal. There are 78 5mm LEDs in the drilled holes (34 red, 33 yellow, 10 green, 1 blue). The star's tail is the ne555 + cd4017 base configuration. Three series-connected LEDs are connected to each counter output. The center of...[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]

Hello. Here I will describe the step-by-step process of replacing the WiFi module from a smart device. We usually do this replacement when we want to remove the WiFi module from the inside, which we are not able to program and replace it with something more popular, e.g. a module based on ESP. This allows us to ultimately use the selected...[Read more]

In fact, I thought about publishing this material here on the forum for quite a long time. My concerns relate to the safety of such a repair. However, while browsing the internet, a dozen or so pages presenting a similar activity and the number of sold DC power cords for laptops, I decided that maybe it is worth including it, but at the same...[Read more]

Hello Here I will present a step-by-step process of writing my own open source firmware for the XR809 / XR3 WiFi module using the example of a door opening sensor. My firmware for it will be compatible with Tasmota HTTP protocol and will allow it to be used independently of the manufacturer's servers. It will also give us compatibility with...[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]

The question of plus and minus in a mains socket is repeated quite often, it is quite natural to associate the two poles of the socket and the two colors of the wires with the battery but wrong . In the case of a cell or battery, we have direct voltage (DC), the mains supply is alternating voltage (AC). You can find more about direct and alternating...[Read more]

The terms AC and DC refer to electric current. Indirectly, also tensions. DC - direct current - means direct current. In theory, it is a power supply whose parameters are constant over time. Most often we say that about all sources that give a constant voltage. However, no one can guarantee that the output voltage, e.g. from the power supply,...[Read more]

One day I was faced with the fact that I had to change my desktop computer to a laptop. The laptop is chosen, but the dilemma of what to do with the data that is on the HDD drives and there is over 4TB of them. The idea of a fast NAS server, but their price knocked me off my feet. I started searching the internet and found two interesting...[Read more]

Just because you can connect the two wires together doesn't mean you should ... but if you must, the article below will show you how. Of course, the easiest way to connect two conductors is to twist them together. If we know how to do this, the connection can be rugged and mechanically strong, ensuring good electrical contact. However,...[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]