Home / Roland Pelayo

Roland Pelayo

Roland is the brains of Teach Me Microcontrollers. He is a firmware engineer who have ten years (and counting) of experience in developing electronic and microcontroller-based systems. Roland's designs include medical devices, security and automation, robots, emergency alert systems and educational training modules.Besides writing for TMM, he currently heads the Electronics Engineering Program of Holy Cross College in Davao City. He was also once a technical editor of All About Circuits and Maker.ProRoland is open to consultation or microcontroller firmware projects: just contact him via the contact page.

ESP32 WiFi Manager | Dynamic SSID and Password

ESP32 WiFi Manager

If you've been following my tutorials on ESP32, then you'll notice that the WiFi SSID and password are always hardcoded. This tutorial will show you a way to change the WiFi credentials without needing to edit and re-upload your sketch. Our aim is to create a simple ESP32 WiFi manager. …

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Getting Started with Blue Pill and STM32Cube

Arduino is easy-to-use but that's at the expense of numerous features, most glaring of them is speed. Hence you would rarely see an Arduino in an embedded, industrial setting. ARM Cortex-M microcontrollers are low-cost, energy-efficient 32-bit devices with up to 2 DMIPS/MHz. They are the microcontroller of choice if you …

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Arduino State Machine Tutorial

Arduino State Machine Diagram

A finite state machine (FSM) is a theoretical machine that only has one action or state at a time. The machine may go from one state to another if there are inputs (or one input) that triggers the state change. In this article, I will guide you on how to …

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ESP8266 SPIFFs | File System for NodeMCU

ESP8266 NodeMCU SPIFFS

SPIFFS or Serial Peripheral Interface Flash File System is a system that utilizes extra flash memory on the ESP8266 and ESP32 for storing files. It’s so named because the user reads, writes or deletes files in the memory using the serial interface. In this article, I will show you how …

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How to Use MQ-4 Methane Gas Sensor

MQ-4 methane sensor breakout board

The MQ-4 is one of many gas sensors ready to be interfaced with microcontrollers. Just like the rest of the MQ sensors, the MQ-4 is most sensitive to a particular gas. This time, it’s methane, although the sensor can still detect other flammable gases like butane and propane.

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Using AD9833 Signal Generator with Arduino

Arduino AD9833 signal generator

Ever wondered how you can create sine, square or triangular waves with Arduino? Apparently, there’s a way with the help of an integrated circuit package called AD9833. With it, you can now create waveforms for communications, instrumentation or other related projects. My tutorial on building your own Arduino signal generator …

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