Articles

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,... [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... [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... [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... [Read more]

Hello, here I will test another Smart Home device, this time based on Zigbee protocol: cheap Tuya temperature/humidity sensor with an LCD display, model TS0201. I will try to pair it with Home Assistant by using Zigbee2MQTT plugin. Then, of course, I will also do a short teardown... [Read more]

Here I will present short teardown of an old sat tuner Kathrein, model Innovatron UFD 41 260211 and then I will try to show the operation of some more interesting parts from inside and discuss their use in DIY projects. I will try to get running here, among others, RF modulator (ALPS),... [Read more]

Hello my dear. I will present here the Aqara door / window opening sensor model MCCGQ11LM. I will pair it with Home Assistant via Zigbee2MQTT, show its operation, interior and present the automation possibilities it offers. Aqara door opening sensor The sensor was purchased on one... [Read more]

Hello my dear. Today we will test and watch another product designed for a smart home, namely the WiFi-controlled WL-SW01_16 16A relay from Tuya. We will check on what elements it is implemented and whether it is possible to upload an alternative firmware to it. Purchase WL-SW01_16... [Read more]

Hello my dear. Here I will test a WiFi driver / dimmer for a single-color LED strip compatible with the SmartLife application. Then I will show its interior and sketch its diagram. I will also check how high the currents it can withstand and repair a minor defect that will arise as... [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... [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... [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]

Hello my dears. . I will test and take apart here the qTouch WiFi/RF433 light switch, which is distinguished from other products of this type by the fact that it only plugs into the L wire, meaning that it will work even if we don't have an N led to the box. I will test this switch... [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... [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... [Read more]

Hello, here I will present the Aqara temperature / pressure / humidity sensor model WSDCGQ11LM. I will pair it with Home Assistant via Zigbee2MQTT, show its operation, interior and sample graphs of data collected with it over a few days at the end of winter. Aqara temperature / pressure... [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... [Read more]

Here I am going to present my Home Assistant compatible network relay driver, based on Tasmota HTTP protocol. The controller is using the PIC18F67J60 8-bit MCU with integrated RJ45 cable networking and features relays control, temperature reading, alarm clock, buttons, independent... [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... [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... [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.... [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 Gdańsk, while digging through the piles of antiques,... [Read more]

At the beginning, I would like to thank everyone who did not believe in me - my strength in you! :D Table of Contents: 1. Introduction 2. Assumptions 3. Mechanics of movement 4. Why not CoreXY? 5. The final shape of the "cross" 6. Toolchange - a system of variable tools 7. Parking... [Read more]

The title picture is probably a bit familiar from my previous topic about pictograms. Today the device is ready. Generally available weather stations have one thing in common - the LCD display. It has its advantages and disadvantages. When it comes to the readability of these panels,... [Read more]

I have been using the Chinese DDS generator module for some time, I got tired of the makeshift of this device, the lack of a housing, a spider power supply from some li-ion batteries and converters, so I decided to sort it out inspired by previous publications on the electrode. Having... [Read more]

Hello my dear Here I will describe in detail how you can easily start your adventure with Home Assistant. I will present its configuration on various platforms (Raspberry Pi, Banana Pi, virtual machine) and demonstrate how to connect the first devices to it via WiFi and Zigbee. Introduction... [Read more]

It was already 8051, now it's time for the Z80. The computer consists of several modules. The motherboard contains a Z80 processor, 512kB RAM and 512kB flash memory, IO 8255 chip and the Atmel ATF1502AS 5V CPLD that connects it all, which also works as a memory bank switch. The... [Read more]

Today, a simple design - a 'desktop' server with the capacity to accommodate 8 drives. Everyone wants a file server that is small, cheap, capacious, expandable and powerful. As it is in life, it is difficult to combine all these features.... But let's try an intermediate proposal... [Read more]

Hello my dears Here I will present in detail how to configure and inside the battery-powered WiFi door/window sensor compatible with the SmartLife smart home control application. I will also show here how you can configure its work scenarios, e.g. automatically turn on the light bulb... [Read more]

Hello, inspired by the designs presented on the forum, I decided to build my own amplifier, the project is strongly based on Mosfet 2x50W amplifier with atTiny driver and remote control the heart of which is a power amplifier copy of the Rotel RA-820. The diagram of the whole is not... [Read more]