An SSH server on ESP32 lets you log in to your microcontroller over Wi-Fi using a secure terminal connection. Instead of opening the Arduino Serial Monitor through USB, you can connect from a computer, phone, or another device on the same network and send commands remotely. In this tutorial, you …

The TP4056 charging module is one of the most common boards used for adding USB charging to small battery-powered electronics projects. If you are building an Arduino, ESP32, Raspberry Pi Pico, sensor, robot, or portable display project, this module can charge a single 3.7 V lithium-ion or lithium-polymer battery from …

The Raspberry Pi 5 is powerful enough to run vision, robotics, and automation projects, but its GPIO pins cannot directly drive DC motors. A motor needs more current than a Raspberry Pi GPIO pin can provide, and motors also generate electrical noise that can damage sensitive electronics. That is where …

The ESP32-S3 is one of the most useful ESP32 boards for modern microcontroller projects. It keeps the Wi-Fi and Bluetooth features that made the original ESP32 popular, but adds better USB support, more memory options, and features aimed at AI, signal processing, and Human Interface Device applications. If you are …

The ESP32 is powerful enough to host a small web server directly on the board. This means you can control LEDs, read sensor values, update a webpage, or build a simple browser-based dashboard without needing a separate computer or cloud server. One of the most useful libraries for this is …

If you are connecting an ESP32 to a UART device, both sides normally need to use the same baud rate. For example, if your external module is sending data at 9600 baud but your ESP32 is listening at 115200 baud, the data will not be read correctly. Fortunately, some ESP32 …

flashWhen compiling embedded C or C++ firmware, you will often see compiler flags such as -O0, -O1, -O2, -O3, -Os, and -Og. These are compiler optimization levels. They tell the compiler how much effort it should spend improving the generated machine code. For desktop applications, optimization usually means “make the …

In embedded systems, every byte matters. Whether you are working with a small 8-bit microcontroller, an ARM Cortex-M device, or a memory-constrained IoT module, understanding how data is stored in memory can help you write more efficient and reliable firmware. One common source of confusion is the size of struct …

Attackers rarely announce themselves. More often, they find a quiet side entrance, and firmware is exactly that. It's the invisible software layer that wakes your device before anything else does, and it's become one of the most exploited attack surfaces in modern security. The numbers are hard to ignore: only …

When building a prototype on a breadboard, it is easy to move jumper wires around until everything works. But once you turn that circuit into a printed circuit board, every pin choice becomes much more permanent. A poorly chosen GPIO can cause boot problems, programming issues, noisy analog readings, or …