Home / Roland Pelayo (page 2)

Roland Pelayo

I started TMM back in 2015. I’m a firmware and embedded systems engineer with over ten years of experience designing and developing electronic and microcontroller-based products. Over the years, I’ve worked on a wide range of projects, including medical devices, access control and security systems, automation, robotics, wireless communication modules, IoT systems, imaging and sensor instruments, and educational training tools. I’ve built systems using platforms such as PIC, AVR, ESP32, STM32, nRF52, and Raspberry Pi, and I regularly work with protocols like RS485/OSDP, CAN, TCP/IP, Wiegand, and a variety of sensor and communication interfaces. I also develop full-stack solutions for embedded projects, combining firmware, hardware, and web-based dashboards when needed. If there’s a topic you’d like me to write about, or if you need consultation or hands-on development for electronics, embedded, or firmware projects, I’m always open to working on new ideas and collaborations. You can reach me anytime through the contact page.

Raspberry Pi + Portable Monitor Use Cases 

raspberry pi portable monitor

In the realm of DIY electronics and compact computing, the Raspberry Pi stands as a titan. Since its inception, this credit-card-sized computer has evolved from a simple educational tool into a powerhouse capable of driving complex artificial intelligence, high-definition media centers, and professional-grade server environments. However, the true mobility of …

Read More »

Common Errors in LED Display Service for Traffic Signs

Variable message signs are the backbone of modern traffic management, delivering real-time information that keeps roads safe and traffic flowing. When these systems fail — even briefly — the consequences can range from driver confusion to serious safety hazards. Yet LED display errors in traffic sign service are far more …

Read More »

How to Use an NPK Soil Sensor with ESP32

ESP32 NPK Sensor

If you are building a smart agriculture project, one of the most useful things you can measure is the nutrient condition of the soil. Moisture sensors can tell you if the soil is wet or dry, but they cannot tell you whether the soil still has enough nutrients for healthy …

Read More »

ESP32 + INMP441 I2S Microphone with Live Web Graph

In this project, I’ll show you how I interface the ESP32 with the INMP441 I2S microphone module, starting from basic audio capture and then moving toward a more interactive application where the sound is visualized in real time on a web browser. When I first worked with microphones on microcontrollers, …

Read More »

Flexible PCB Assembly and Soldering

Flexible PCB Assembly

In today’s fast-evolving electronics landscape, PCB assembly has transcended traditional rigid boards to embrace the versatility of flexible PCBs. These bendable circuit boards enable innovative product designs across the medical, aerospace, automotive, and consumer electronics industries.  This guide dives deep into the process of flexible PCB assembly and soldering, outlining …

Read More »

What is a Flexible PCB?

What is Flexible PCB

What Is a Flexible PCB and How Does It Differ from Rigid PCBs? In the ever-shrinking world of electronic devices, flexibility isn’t just a luxury; it’s a necessity. That is why flexible PCBs, or flex circuits, are specially designed printed circuit boards that can bend, fold, and twist without breaking. …

Read More »