Measure temperature, humidity, pressure, altitude, rain, and light with a single ESP32-S3 smart display that handles both sensing and showing data. The project connects BME280, rain, and LDR sensors directly and uses LVGL to create an interactive weather dashboard on its 2.8-inch touchscreen.

This project uses ESP32 to gather air quality info from PMS7003 and BME680 sensors, including particulate matter and gas levels, then displays it on an OLED and a sleek web dashboard. The dashboard logs data, plots graphs, and sends alerts when pollution or air quality crosses set limits.

The PolyCast5 multi-tool uses an ESP32-C5 to control WiFi, Bluetooth, LoRa, ESP-NOW, and IR devices, with an optional AC relay and accessible I2C pins for add-ons. It features a sharp colour screen, haptic feedback, offline apps like a pomodoro timer, customisable scripts, and AI-powered voice and packet tools set up via a browser.

The ELM11 is a Feather-compatible microcontroller board running Lua natively, packing a 70 MHz CPU, 1 MB RAM, and 20 versatile I/O pins that handle GPIO, PWM, UART, SPI, and I²C. It also includes a hardware watchdog, user LEDs, push buttons, and a 3.3 V regulator delivering up to 500 mA.

PowerPD uses an ESP32 and AP33772S chip to turn any USB-C PD charger into a versatile power supply, letting you pick voltages via a rotary dial while showing real-time voltage, current, and power on a tiny OLED screen.

These five smart speaker projects use open-source hardware and local AI to bring voice control to Home Assistant, so you avoid cloud dependency and ecosystem lock-in while maintaining full control of your voice commands.

The Raspberry Pi’s GPIO pins open up lots of possibilities—from switching devices on and off, blinking LEDs, and reading button presses to connecting simple sensors and handling serial protocols like UART, I2C, and SPI. You can even expand with HATs for storage, power, or touch screens.

Switch a relay module on and off using MicroPython on the Raspberry Pi Pico, just like turning an LED on or off. This lets the Pico control bigger devices like motors and lights by acting as an electronic switch.

Voltage sag in high C-rating LiPo batteries happens due to unavoidable internal resistance and transient current spikes during aggressive use. Cold weather, ageing cells, and wiring resistance make it worse, while battery chemistry can't instantly handle rapid load changes. You can cut sag by warming batteries, improving wiring, and choosing larger capacity cells.

Keymera is a fully functional key-chain camera you can build yourself using the XIAO ESP32S3 Sense and 3D printing. It captures 3MP photos, stores them on microSD, and lets you browse them over Wi-Fi, all without needing an app or cloud service.

Matt Deeds shows how to turn a Raspberry Pi Pico 2W into a WiFi router with 10baseT Ethernet using bit-banged software in Rust. It handles full-speed transmit and slower receive, combining wired and wireless connections on a tiny, low-cost setup.

The 2026.5.0 update turns ESPHome’s Device Builder into a workflow-focused tool letting you build many devices at once with job queues and selective updates. It highlights config differences, supports networked compilation, halves CPU use during builds, and adds a visual component editor with live validation.

The IIS3DWB10IS combines a 10 kHz+ bandwidth vibration sensor with an improved Intelligent Sensor Processing Unit, allowing faster data handling and real-time computations for predictive maintenance and robotics uses.

Built around the ESP32-C5-WROOM-1, Waveshare’s new board runs a 240MHz RISC-V core and supports Wi-Fi 6, BLE 5, Zigbee, and Thread, offering 16MB or 32MB flash and antenna options to suit different IoT projects.

Learn how to build a simple, low-cost device that brings per-app volume knobs and 16 macro buttons to your computer without breaking the bank.