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 …

When 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 …

Bittele Electronics provides PCB manufacturing and assembly services for Arduino and microcontroller-based projects, supporting designs that move from breadboard prototypes to assembled printed circuit boards. For developers building sensor boards, data loggers, automation controllers, or custom Arduino-compatible hardware, Bittele’s turnkey PCB assembly service can help combine PCB fabrication, component sourcing, …

Most of the projects I build on TeachMeMicro involve sensors, microcontrollers, displays, and simple control systems. At first glance, that may seem far from home heating systems, but the basic idea is actually very similar. A heating system depends on temperature measurement, switching, timing, airflow, and feedback. These are the …

Web developers frequently construct bespoke applications to solve specific data problems. When it comes to search engine optimisation, standard out-of-the-box software often lacks the granular flexibility needed for highly specialised analytics. By combining advanced web scraping techniques with official application programming interfaces, developers can build custom tracking dashboards that deliver …

Access control systems are commonly used in offices, schools, laboratories, apartments, and industrial facilities. At the center of these systems is a controller that decides whether a person is allowed to enter, controls the door lock, and monitors alarm inputs. In this tutorial, I will build a small access control …