Hello I've always wanted to build a musical tesla coil, but I was overwhelmed by the complexity of the design schematics found on the internet. Some time ago I found a schematic of a single transistor based coil and decided to improve it so that it could play sound. I decided to share the project so that others could make such a simple...[Read more]

The topic is related to: edu elektroda.pl # 04 operational amplifiers - LED current stabilization FAQ LED flashing to the beat of the music As you can see, a lot of space is devoted to LED flashing to the rhythm of the music and why set up a new, related topic? The reason for this is the designed chip, the Chinese putty, which needs the fewest...[Read more]

Hello, after a long break. This time the Chinese ... chip from Taiwan was used to build an IR remote for TV from LG. The remote control can turn on / off the TV, change the channel or the volume. The number of functions has been limited due to the small number of IO of the microcontroller. The used PFS154 can be changed to PMS150C after a...[Read more]

What some on the forum know is that I like LED blinking. In this project, I gave it the maximum vent and was able to get carried away by the wave to such an extent that by the end I had had enough :) You remember Earth Command Center by colleague @ reaven22? Yes, it was his design that was the inspiration for my construction and even for...[Read more]

Hello I would like to present the 1.9 DIY-A586 version, with the modifications that have come to my mind over the years. I skipped a few numbers so that I would not be tempted by another v1.x from XC6SLX9 :) . Differences: 32MB RAM, JOY1 / 2 without multiplexing, 2 flopps without additional circuits, 18.432MHz generator, space for THT LEDs,...[Read more]

Hi. I made a power supply, nothing innovative because it is a good construction that has been going through the internet for over a dozen years. With this construction, I put more emphasis on the design (at least I think so). Despite quite a long thought process, this power supply was not without mistakes. Fortunately, these errors do not...[Read more]

Another Nixie clock built by me, this time using ESP8266. The project is based on a schematic with software found somewhere in Russian forums. The lamps in the clock are the Z573M. For control, the NodeMCU v3 module, 74hc595 shift registers and k155id1 BCD decoders were used. The casing is made on a 3018 CNC milling machine from 10 mm plywood...[Read more]

Hello I would like to present the effect of my experiments with the Peltier cell. Such a cell is used, for example, in car coolers, after connecting the electricity, the phenomenon of heating of one side of the cell occurs while cooling the other. I began to wonder if it is possible to reverse the process, and thus provide such a cell with...[Read more]

I liked the Byrrt weather station Link So I decided to create my own, simpler and stupider version on the commonly available and cheap DS18B20, BMP180 and DHT11 sensors (but with a housing). I aimed at the readability of the information on the display, so there are no infographics, no "trends", etc. Indoor and outdoor temperature, pressure,...[Read more]

In this article, I will describe the reason for inventing and designing a tester for microSD memory cards, which will be used to check some interesting properties of cards. Cause of the uprising MMC / SD / microSD cards, apart from their natural applications, are also liked by fans of microcontrollers for several reasons: * can be used as...[Read more]

Good day. This year I have completed a project that I have been thinking about for a long time. It is an electronic protection of the lithium-ion battery (3s 12 V) against excessive discharge and, consequently, against permanent damage. The whole is in the form of a printed circuit board with a multi-turn potentiometer to adjust the operating...[Read more]

A few days ago one of the people asked me to "conjure" her joystick for Pegasus in the style of a stick (shuttlecock). These types of controllers were popular, for example, among Atari or Commodore consoles, while for Pegasus my eyes had never seen anything like that. So it was necessary to find some ready-made joystick and adjust its communication...[Read more]

I just thought that if anyone was interested, maybe they would benefit. The test project was created in EASYEDA and it even looks quite good, after Christmas I will start it. The project itself is available in four versions: with transistors: sap15, std03, darlingtons in MT 200 and TO3 housings, the last two versions are in the process of...[Read more]

The presented microproject was created due to the damaged eeprom memory content in the logic analyzer clone on the CY7C68013A, commonly sold as saleae 8ch / 24MHz. Once the analyzer refused to obey, I decided to get acquainted with the topic a bit. Replacing and programming the eeprom with the correct data would be too trivial as usual (I...[Read more]

Temperature "stabilizer" for transformer soldering iron. For many years I have been irritated by the lack of control over the temperature of the transformer soldering iron tip. I tested various circuits, regulation on thyristor, impulse control of the soldering iron by a multivibrator - don't build it, it's a waste of time. These systems...[Read more]

Effects of recent works and activities with CAN buses. I sat down and wrote soft to work with CAN BUS, it is supposed to work as an analyzer, recorder / player, bomber etc. The assumption to achieve maximum functionality with relatively cheap hardware. As STM32F103 hardware with any USB-Bridge (it is suitable for non-clogged buses), or STM32F042...[Read more]

Welcome. I would like to present you a simple controller for charging batteries from a small wind turbine, using a ready-made up / down converter module on the XL6009 chip. However, I must start with the fact that I have dreamed of having a small wind turbine for a long time. And although reading many statements on the Internet convinced...[Read more]

There is such a small, neat and cheap USB Blaster programmer for Altery CPLD / FPGA circuits, which fulfills its role perfectly. Unfortunately, it does not provide the supply voltage, which requires the programmable circuit to be powered from an external source. Different circuits have different supply voltages (and sometimes even several)....[Read more]

Recently, you can buy interesting AM / FM tuner modules on the TEF6686 chip. Such a module costs about PLN 100 and is sold as an FM head for car radios. It has amazing possibilities, great sensitivity and selectivity, adjustable de-emphasis and filter. The module is already output analog audio L + R, or MPX, depending on the configuration....[Read more]

Hello to all users of the Electrode Forum. A bedside lamp is a simple device consisting of just a few elements. This one is designed to please the eye and `` create a mood '' while listening to music, it was made in the form of a tube monoblock. Before I get verbally lynched by users of the Electrode forum for wasting a good tube,...[Read more]

For some time now, I became interested in network security and came across an article on how to make a Wi-Fi Jammer (deauthentication attack). I did not even suspect that you can make someone's life so easy and simple. To make a Jammer All we need is esp8266. The principle of operation is very simple. Our device pretends to be a router...[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]

Do you have audio equipment that is too old to support Apple Airplay that you want to use? You don't want to replace it with lower-quality wireless speakers, but want to listen to music from the Internet? This is a common problem. The good news is that solving this problem costs as much as the Raspberry Pi - not much. Based on this minicomputer,...[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 author, while shopping with his girlfriend, had quite a lot of time to think and look around. As he wandered from store to store, a mirror displaying inscriptions caught his attention. It was then that he had the idea to build a similar one, but better for himself. Your own magic mirror! What is needed to build such a system? * Mirror...[Read more]

This article will describe how to display and record car diagnostic information with a Raspberry Pi. Step 1: Required materials To complete this project you will need: o Raspberry Pi Model B or B + o Car stereo (must have an AUX socket) o Bluetooth adapter o Car charger o USB or Bluetooth adapter based on ELM327. o RCA cable o Keyboard (optional)...[Read more]

Spot welders are used in almost all plants where it is necessary to join sheets. The advantage of welding machines is the precision of joining (with very good electrical contact), and a very low voltage between the electrodes, which makes the device safe. The presented device is of course not a professional welding machine, but an amateur...[Read more]

Hello. I made a soldering iron for plastic. I saw a similar company, and that the construction is very simple and you have to pay for welding, it is worth doing. 5mm diameter, 2m of hose, a piece of cable with a plug. The required pressure is 0.5 ÷ 1.5 bar. I used a simple regulator on a triac to regulate the heater. And the cube to connect...[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]

This is a short teardown of the E27 A60-Bulb LED RGBCCT which is based on BK7231T Basic Informations: Brand: Tuya Model: E27 A60-Bulb LED RGBCCT Chip: BK7231T (WB2L) Vendor: Got it discounted from a local marketplace, but I'm pretty sure the same bulb is available in aliexpress provided it's in the same packaging as below. My unit was sold...[Read more]

Product information Tuya 4 CH touch switch for Roma fitting for Indian homes, it has CB3S chip (BK7231N) Technical Specs TuyaMCU: T1616-N TH 2720E (ATTINY1616) Darlington transistor array ULN2003A Relay: 5A 230V x 4 Power Module: HLK-PM01L This switch consists of 3 board, soldered with long header pins, Top board is the controller board, top...[Read more]

Protium 4 Gang ON/Off Modular Smart Switch, Fit on 2 Module of Roma Plate for Indian homes. This device has WB3S (BK7231T) chip and TuyaMCU Product Images How to open The switch touch plate is mounted to the housing with 4 clips, 2 on each sides. Gently press the clips inside and then push out towards the touch plate Teardown WB3S is sandwiched...[Read more]

Hello, today I will present how to tame another Chinese WiFi + Bluetooth microcontroller, the W800-C400 produced by WinnerMicro. At the moment, you can buy it for about 3$, while the development board costs about 5$ and both of these prices already include the shipment. Of course, I will not use such a board here, but continuing my tradition...[Read more]

In this thread I'll explain how to re-flash this TuyaMCU smartswitch with OpenBeken and connect it to HomeAssistant . OpenBeken is an alternative, open source software for IoT devices, offering, among others independence from the manufacturer's cloud, compatibility with many ecosystems, configurability and support for various platforms, including...[Read more]

Hello everyone. Recently, I have measured several dozen handheld antennas and 3 car antennas in the amateur 2m and 70cm ranges in an amateur way. Here is the list: 01 Retevis RHD771 (2.15dBi) Aliexpress RETEVIS Official Store 03 Nagoya NA-771 (2.15dBi) Aliexpress? 07 Yaesu VX-6R Factory attached to the radio 08 Wouxun KG-UV8D Factory attached...[Read more]

The Nous Smart socket A1 contains a BK7231N and BL0942 power monitor. The BK7231N is soldered to one of the pcbs and is not on a separate module. Disassembly of the device is easy as there is a triangular screw under a paper label stuck onto the transparent plastic part of the socket. Inside are 3 pcbs, one contains a switched mode 12V power...[Read more]

Hello, I will present here how the DT-BL10 development board looks in practice, offering BL602 from Bouffalo Lab, i.e. a Wi-Fi + BLE microcontroller clocked up to 192MH. I became interested in BL602 because it started to appear in various types of IoT devices, such as smart LEDs, WiFi controlled relays, LED strip controllers, etc. It is not...[Read more]

Here I will show how you can easily use a TuyaMCU device (dimmer) with my OpenBeken and connect it to Home Assistant . OpenBeken is an alternative, open source software for IoT devices, offering, among others independence from the manufacturer's cloud, compatibility with many ecosystems, configurability and support for various platforms,...[Read more]

I will show here a slightly less typical type of WiFi transmitter, which allows you to use the bistable button you had previously to control the device. I will also show how you can convert any other kind of smart switch to work with external bistable button by using OpenBeken . Classic sonoff-type IoT relays have only a small momentary button...[Read more]

QIACHIP Universal WIFI Ceiling Fan Light Remote Control Kit model: KLCW-110v/220v buy: amazon.com , aliexpress.com It transforms your traditional ceiling fan and its light into a "smart" fan and light! This controller has the following functions: Turn the fan on or off. Turn the light on or off. Set the speed of the fan to low, medium or high....[Read more]

I was hoping to buy the sockets that were ESP based so bought two different versions at very different prices, however these had CB2S modules, after some searching I found this site and the excellent work on OpenBK7231N. These are the sockets - both look exactly the same inside and out - even the boxes are the same So I opened them up, no...[Read more]

Hello, here I will present the world's first Tasmota replacement for the BL602 devices, offering, among others. the possibility of pairing our device with Home Assistant via MQTT. I will show here how you can easily upload a firmware to BL602 using a simple USB to UART converter and I will also describe the SDK compilation process for people...[Read more]

Hello my dear. I invite you to a practical test of the cheapest solar charger with USB 5V output. This charger comes in the form of a single 26cm x 14cm panel and has an integrated converter with (if possible) a stable 5V output. In this topic, I will check whether in sunny, March / April weather, you can actually charge the phone with it...[Read more]

Hello, here I will present the progress report of my work on the open firmware for BK7231T. This topic will be written in the form of a tutorial, I will present here step by step how I developed my own, cross-platform (running on Windows and BK7231T) mini HTTP server, pin configuration system via the web panel and how I connected it with...[Read more]

I will present here a unique set of universal boards for SMT microcontrollers in cases like TQFP100, TQFP64 and TQFP48, various SSOP, SOIC, etc. filters, power block) and a large amount of free space for additional systems (prototyping zone). As part of the demonstration, I will setup a basic breakout for different microcontrollers, two made...[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]

We have probably heard the term "magic eye" referring to the tube technique many times, but few people, especially the younger ones, know what it is about. So I will explain what we are dealing with. The so-called Magic eye is a vacuum electron tube whose task is to signal the voltage level. In the tube era, it is mainly used as an indicator...[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]