9 ESP32 & The DHT Sensor скачать в хорошем качестве

9 ESP32 & The DHT Sensor

This guide demonstrates how to integrate DHT11 or DHT22 sensors with an ESP32 microcontroller to monitor environmental data. The process involves connecting the sensor’s power, ground, and signal pins to the board, specifically utilizing a GPIO pin for data transmission. To simplify the programming, the author utilizes the DHT sensor library within the Arduino IDE to initialize the hardware and capture readings. The provided code facilitates the collection of temperature and humidity levels, which are then formatted and displayed through the serial monitor. Users are advised to include delays between readings to ensure the sensor provides the most accurate data possible. Ultimately, this tutorial serves as a foundational step toward more advanced projects, such as building a wireless web server for remote monitoring. The video you provided serves as a tutorial for connecting and programming DHT11 or DHT22 temperature and humidity sensors using an ESP32 board. Below is a comprehensive guide based on the sources regarding how to set up the hardware and software for this project. 1. Hardware Connections The DHT sensors typically have three pins that need to be hooked up to the ESP32: • GND (labeled "-"): Connect this to the GND pin of the ESP32. • VCC: This can be connected to either the 5V or 3.3V pin on the ESP32, as these sensors do not require high voltage to power up. • Signal (labeled "S"): This is the data pin. While it can be connected to any GPIO pin, the tutorial specifically uses GPIO 26,. 2. Software Setup To interact with the sensor, you must use the DHT sensor library (the tutorial utilizes version 1.4.4) within the Arduino IDE. • Initialization: After including the DHT.h library, you must create a DHT object by specifying the GPIO pin used and the sensor type (DHT11 or DHT22),. • Setup Function: You initialize the sensor using the begin() method. It is also necessary to initialize the Serial Monitor at a baud rate of 115200 to view the data. • Timing: The sources recommend adding a 2-second delay in the setup and loop functions because these sensors require time to load values and provide accurate results,. 3. Reading and Displaying Data The library provides simple functions to extract environmental data into float variables (decimal numbers): • Temperature: Use readTemperature(). This returns the value in Celsius by default, though passing true as a parameter will return the value in Fahrenheit. • Humidity: Use readHumidity(), which returns the value as a percentage. To see the results, the code uses Serial.print to display the values and units on the Serial Monitor. When uploading the code to a board like the NodeMCU-32S, you may need to hold down the boot key during the process. 4. Summary of Key Steps Step Action Wiring Connect VCC, GND, and Signal (GPIO 26),. Library Install and include DHT sensor library. Coding Define sensor type, use dht.begin(), and readTemperature()/readHumidity(),. Output Monitor data at 115200 baud with a 2-second polling interval,. -------------------------------------------------------------------------------- Analogy for Understanding Think of the DHT sensor like a weather reporter standing outside a station (the ESP32). The reporter needs a power source (VCC) and a ground to stand on (GND). Every few seconds (the delay), the station asks for an update. The reporter then sends a specific signal (the data pin) back to the station, which translates those signals into a clear temperature and humidity report for the public to see on a screen (the Serial Monitor). Describe the three pin connections for the DHT sensor. Which Arduino library is required to interface the DHT sensor? Explain the process for initializing the DHT sensor in code.