Roland Pelayo | Microcontroller Tutorials

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.

Input and Output with STM32 Nucleo

March 13, 2018 STM32 Tutorial

We managed to blink an LED in the previous tutorial. This time, still featuring the STM32F1 Nucleo, we will add a button that will control the attached LED and a simple clap switch.

Blink a LED with STM32 Nucleo

March 10, 2018 STM32 Tutorial

On the previous tutorial, we managed to create our first program with the STM32 Nucleo board. Now we will dig deeper on the pinout and other functionalities of the board.

Getting Started with STM32 Nucleo and Mbed

March 9, 2018 STM32 Tutorial

The STM32 Nucleo boards by ST pack a lot more power than an Arduino UNO and have headers aligned the same way with the latter which makes it compatible with Arduino shields.

How to Interface a Thermistor

February 28, 2018 Arduino Tutorial

A thermistor is a special resistor whose resistance varies with temperature. Learn how to interface a thermistor with a microcontroller in this tutorial.

How to Use a Web Cam with Raspberry Pi

February 22, 2018 Raspberry Pi Tutorial

The Raspberry Pi comes with a camera connector on board. But if you don't want to buy the official camera and use a web camera instead, you can! I'll show you how to display a video from the webcam on a web server hosted by a Raspberry Pi

Setting up a Raspberry Pi Zero Web Server

February 22, 2018 Raspberry Pi Tutorial

I finally got my hands on a Raspberry Pi Zero W and started the usual tinkering. For those unaware, this smaller version of the Raspberry Pi packs a 1 GHz CPU and 512 MB of RAM. But what excites me the most is the WiFI and Bluetooth connectivity that comes …

How to Use LCD without Potentiometer

February 15, 2018 General

Maybe you’ve used an HD4480-based LCD before (pictured) and you know that it requires a potentiometer for adjusting contrast. Is there a way to remove this potentiometer completely?

All About Microcontroller Power

February 9, 2018 General

I got plenty of questions regarding microcontroller power outputs and requirements especially for popular ones like PIC or the Arduino. So I decided to answer all of them in this post. Technically, Raspberry Pi and BeagleBone Black are not microcontrollers (I like to call them microcomputers) but I decided to …

Creating NodeMCU WiFi Access Point

February 8, 2018 ESP8266 Tutorial

You can use WiFi with the NodeMCU (ESP8266) even without a WiFi router. All you need to do is create a NodeMCU WiFi Access Point and the device will now act as a WiFi gateway.

Web Server with NodeMCU WebSocket

February 8, 2018 ESP8266 Tutorial

Uploading sensor data to web servers is one of the core ideas for Internet of Things (IoT). Such data are often small-sized and are continuously updated over time. And while HTTP performs satisfactorily for simple applications, like how I showed in my NodeMCU web server tutorial, there is a need …