The CD74HC4067 16-channel analog multiplexer module solves the opposite problem of an I/O expander: instead of adding digital pins, it lets you read 16 analog signals through a single ADC pin. The module is based on the CD74HC4067 from Texas Instruments and is one of the cheapest and simplest ways to connect a whole array of sensors, potentiometers or buttons to a […]
CD74HC4067 16-Channel Analog Multiplexer – Complete Guide Read More »
The MCP23017 16-bit I/O expander module is one of the easiest ways to add extra GPIO pins to your ESP32 project. The module is based on the MCP23017 from Microchip and gives you 16 additional, fully configurable I/O pins over a simple two-wire I²C bus. Running out of pins on a compact board like the ESP32-C6 SUPER MINI? This is the
MCP23017 16-Bit I/O Expander – Complete Guide Read More »
The CC1101 868MHz SPI RF module is a compact, low-power sub-GHz transceiver widely used in IoT, industrial telemetry, home automation and custom RF networks. The module is based on the CC1101 from Texas Instruments and offers significantly more flexibility than simple ASK/OOK transmitter modules. In this complete guide we cover: What is the CC1101? The CC1101 is a programmable sub-GHz RF
CC1101 868MHz SPI RF Module – Complete Guide Read More »
The JL-AD3W-HT-V3 is a compact AC-to-DC power supply module commonly found in low-cost embedded electronics, IoT devices, and DIY projects. It converts mains voltage directly into a regulated low-voltage DC output, typically 5 V, making it a popular alternative to bulky wall adapters or external power bricks. This article covers the JL-AD3W-HT-V3 as a hardware component: what it is, how it
JL-AD3W-HT-V3 – Everything You Need to Know About This AC-DC Power Supply Module Read More »
The BL0942 is a highly integrated, calibration-free single-phase energy metering IC designed for smart plugs, smart sockets, power strips, and energy-aware appliances. It provides accurate measurement of active power, voltage RMS, current RMS, line frequency, and zero-crossing information, while supporting both pulse output and register-based digital interfaces. Often compared with the popular BL0937, the BL0942 is not merely a pin-compatible refresh, but a more capable, register-driven metering IC intended
The Ultimate Guide to the BL0942 Energy Meter IC Read More »
The BL0937 is a highly integrated, cost-effective single-phase energy metering IC designed for modern smart sockets, power strips, and intelligent appliances. Engineered for accuracy, stability, and simplicity, it enables precise measurement of active power, voltage RMS, and current RMS using only a handful of external components. Whether you are a hobbyist building a smart plug
The Ultimate Guide to the BL0937 Energy Meter IC Read More »
Circular displays are a unique twist for DIY electronics projects. While most LCDs are square or rectangular, the 1.28-inch round TFT display gives your project a modern, smartwatch-like look. It’s based on the GC9A01 controller, offers a 240×240 full-color IPS panel, and connects over SPI. In this guide we’ll explore what it is, how to wire it, how to drive
The Complete Guide to the 1.28-Inch GC9A01 Round TFT Display Module Read More »
When it comes to detecting motion in DIY electronics, the HC-SR501 PIR sensor is one of the most popular and affordable choices. It’s used everywhere: alarm systems, automatic lights, smart home devices, and even art installations. In this guide we’ll cover how the sensor works, its specifications, wiring, configuration, and how to use it with
The Complete Guide to the HC-SR501 PIR Motion Sensor Read More »
The 2.25 inch TFT LCD ST7789 SPI display is a compact but powerful module, perfect for all kinds of embedded projects. Whether you are using an ESP32, Arduino, or Raspberry Pi, this screen allows you to display sharp, colorful graphics. In this article, we will take a closer look at the specifications, pinout, and how
2.25 inch TFT LCD ST7789 SPI Display Read More »
When you need to measure light intensity in your projects — whether it’s for smart lighting, weather stations, or battery optimization — the BH1750 is one of the easiest and most reliable sensors to use. It’s a small, inexpensive I²C module that outputs light levels directly in lux, without the need for complex calibration or
The Complete Guide to the BH1750 Digital Light Sensor Read More »
