In this project, we will learn to publish BME280 sensor readings to Node-Red with ESP32 MQTT using ESP-IDF. We will perform MQTT communication with ESP32 and Node-Red and publish and subscribe to MQTT topics. The ESP32 will act as an MQTT client publisher and Node-Red will act as a subscriber. Using MQTT protocol, the ESP32 … Read more
In this tutorial, we will learn to use ESP32 as an MQTT client using ESP-IDF mqtt_client library. We will learn to publish and subscribe to MQTT topics with ESP32. Firstly, we will see how to make an ESP32 connection with a mosquito MQTT broker as a client. Secondly, we will learn to use mqtt_client library … Read more
In this ESP32 user guide, we will show you how to use FreeRTOS event groups for task synchronization. Often times we come across the situation where multiple tasks are running and task synchronization is required. This may include conjunction or disjunction of events or synchronization checks between different tasks. The FreeRTOS library in ESP-IDF provides … Read more
In this ESP32 user guide, we will learn how to control a DC motor using L289N motor driver and ESP-IDF MCPWM motor driver library. We will briefly discuss L298N motor driver including its specifications, pinout, interfacing with ESP32 board, and then focus on programming our board in VS Code with ESP-IDF extension. We will create … Read more
In this tutorial, we will learn to interface temperature sensor DS18B20 with ESP32 using ESP-IDF library. This guide will include a brief description of DS18B20 sensor, pinout, connection with ESP32 board and then setting up a project in VS Code with ESP-IDF extension to acquire the sensor data and display it both on the console … Read more
In this tutorial, we will learn about DHT22, which is a widely used sensor to obtain current temperature and humidity readings using ESP32 and ESP-IDF. This guide will include a brief description of the sensor, connection with ESP32 board and then setting up a project in VS Code with ESP-IDF extension to acquire the sensor … Read more
In this tutorial, we will learn about one of the most commonly used sensor called BME280 to get temperature, pressure, and humidity readings using ESP32 and ESP-IDF. This guide will include a brief description of the sensor, connection with ESP32 board and then setting up a project in VS Code with ESP-IDF extension to acquire … Read more
In this ESP-IDF tutorial, we will show you how to interface SSD1306 OLED with ESP32. Organic Light Emitting Diode commonly known as OLED is used to display texts, bitmap images, and shapes. Due to its cost-effective nature and great view angle and pixel density. This guide includes a brief introduction to the 0.96-inch OLED display, … Read more
In this tutorial, we will learn to use ESP32 FreeRTOS mutex semaphore and how to use it with ESP-IDF. Resource management is an important and critical feature in RTOS based applications. In RTOS, we may have more than one tasks that share resources with each other such as peripherals, data, or external devices, etc. For … Read more
In this ESP-IDF tutorial, we will learn to use ESP32 GPIO Interrupts using ESP-IDF. We will demonstrate GPIO Interrupts through an example that uses a push button and an LED. The external interrupt ISR routine will provide a signal to FreeRTOS task functions to control the onboard LED. One of the GPIO pin will be … Read more