Your ESP32 doesn't have to stay tied to a wall outlet. With the right board, battery and communication protocol, these five projects can run for months, even up to a year: a door or mailbox sensor, an ESP32-C3 temperature sensor, an e-paper weather station, a LoRa soil moisture sensor and an ESP-NOW doorbell.

The ESP32's capacitive touch pins can sense a fingertip, so they work nicely as touch pads in place of switches. This guide shows you how to use them with the ESP-IDF framework in VS Code.

OctaCalc’s UART Baud Rate Calculator lets you derive the exact baud rate and timing from a microcontroller’s clock, oversampling factor and divisor, or simply check the error between a desired and actual rate. It’s handy when setting up serial links on AVR, STM32 or ESP32 boards, ensuring the ±2 % tolerance needed for reliable UART communication without manual spreadsheet work.

Want a wired network connection for a board that doesn't have one? Olimex's compact UEXT-CH390 module gives Raspberry Pi Pico, Pico 2 and several ESP32 boards Ethernet at up to 100 Mbps. It's open source, and the schematics, KiCad files and code examples are available on GitHub.

Fashion styling and inventory matching are the starting point, but the same local AI pattern could help with assisted dressing for people with visual impairments, beauty tutorials, hotel recommendations and industrial safety. It's built on the Arduino VENTUNO Q, so the guidance works in real time without an outside connection.

This guide shows how to wire a flame sensor, MQ-2 and DHT11 to a NodeMCU ESP8266 and stream the data to KiwisIoT. It's a hands-on prototype for learning how multi-sensor remote monitoring fits together.

Ever wondered how a radio picks one station out of the air? This project answers that with a parallel capacitor and inductor circuit tuned to the frequency you want. Build it on a breadboard and you'll hear the result on a small speaker, while seeing a concept that underpins everything from AM and FM to 5G.

Forget floating voxel dots. This cube puts a full 64x64 RGB panel on every face, around 24,576 LEDs in all, and uses them for animations, games and audio-reactive visuals. The guide walks you through the panel modules, the electronics cradle and the nerve-wracking final fold that seals everything into a cube.

Ever finished an enclosure design, only to find you can't unplug a cable? This guide covers rear-facing versus side-mounted connectors, maintenance access, and a validation checklist. Connector openings and fasteners should stay visible, cables should go in and out comfortably, and the lid should open without trapping any wires.

Ever looked at an old device and wondered whether its display could work with modern hardware? This project captures the parallel pixel data and sync signals from a monochrome STN LCD and reconstructs the picture on VGA. The same approach could potentially suit other older displays too.

Before nodes, gateways and servers make sense, it helps to know what a LoRaWAN network actually is. You'll get a clear definition of this long-range, low-power protocol and how it connects LoRa-based devices to the internet, which sets you up for the rest of the architecture.

Want to really understand how a scope works? Build one. This project turns a NUCLEO-F411RE board into a single-channel digital oscilloscope with a colour TFT display, proper front-panel controls, and automatic readings for peak-to-peak voltage and frequency.

Ever treated an input filter as a simple add-on, only to hit surprises later? This tutorial starts with LC basics like attenuation slope and ESR, then moves on to damping and a worked LTspice example. You'll finish able to estimate conducted-emissions attenuation for single-stage and two-stage setups.

Want one converter that covers a huge output range? This Design Idea uses a two-phase flyback topology and a ground-referenced control voltage to set the output linearly. It's scalable and low-cost, and it works with the MIC3808/MIC3809 or similar controllers to give you 0 V to 200 V at up to 60 W.