schematics – Viktor’s DIY Blog

Building a Smart 4-Channel PWM Controller with ESP32 and High-Efficiency MOSFETs

June 2, 2025 June 2, 2025

This 4-channel PWM controller uses an ESP32 (for smart control), TC4427 MOSFET drivers, and CSD17573Q5B MOSFETs (for efficient switching). It delivers precise, adjustable power (up to 18V/10A per channel) with minimal heat loss. Features include WiFi/MQTT control, local button inputs, and gamma-corrected LED dimming. Designed for a 12V LED spotlight, it’s also ideal for motors, heaters, or lab supplies. Fully open-source—schematics, firmware, and 3D-printable enclosure files are available.

iot, life hack, project, proof of concept

How I Made a Clock out of Parts of Old Projects

December 29, 2023 December 29, 2023

One side effect of ordering PCBs from a professional fab house is that you always get more PCBs than you actually need. For example, when you place an order for a PCB prototype at PCBWay, you get at least 10 copies of the PCB, sometimes even more. In most cases, …

iot, project

ESP32-S3-Mini-1 Development Board

November 19, 2023 November 20, 2023

Below I present my own ESP32-S3 development board. The reason for creating my own development board is twofold: Features and advantages This board is using the ESP32-S3-MINI-1 module from Espressif. The board’s features include the following: Schematics Here is the schematics of the development board: Board As usual, I designed …

iot, project

Smart Timer Upgrade

September 15, 2023 September 15, 2023

For years this basic timer has worked very well in our house controlling the central heating. It was a success among all people because it was easy to set up and after the initial configuration we haven’t really touched it for years. It just kept working without getting in our …

iot, project

An ESP-Now – WiFi Gateway or Preparing for Integrating Solar Powered ESP Based Devices to my Home Automation System

August 5, 2023 August 5, 2023

Since I live in an area where sunshine is almost always abundant, it makes sense to harvest energy from the sun as much as possible. This includes making various sensors around the house, especially the ones that are outside, operate with solar energy. This is usually not a very difficult …

iot, project

A Word Clock with Extras

July 1, 2023 July 12, 2023

I have long been looking for a way to make a word clock (although there is no shortage of clocks in our home…), but until recently I haven’t found a financially reasonable way to make one. What changed is that I recently acquired a desktop 3D printer. This dramatically expanded …

iot, project

Yet Another RGB Clock

April 7, 2023 July 29, 2024

This article is a new iteration on the wall clock I made a while back. (What can I say? I like LEDs, clocks and clock made up of LEDs…) This time I used a new PCB for driving the circuit and I designed a fully 3D printable enclosure for it …

PC, project

Home Made TPM2.0 Module

April 11, 2022 May 4, 2022

Introduction With the recent launch of Windows 11 Microsoft also made having a hardware TPM module mandatory. Although this technology is not new (it was introduced in Windows 10 and Windows Server 2016), now, that most people can’t upgrade to Windows 11, it will (slowly) become mainstream. (My personal opinion …

featured, iot, project

Privacy Respecting Nanoleaf Replacement Light Panels

January 25, 2022 March 10, 2022

In the following I am going to describe my own version of the light panels that, in my view, eliminate all the disadvantages of the commercial products while keeping all the advantages. I am aware that others have made similar light panels. I am making and publishing my own version, …