ESP32 Tutorial 45/55 - Custom Streamign Server with LED control CAM-3 l SunFounder's ESP32 Learning kit

本课是……的一部分: 基于 SunFounder ESP32 IoT 学习套件的 ESP32 Arduino 课程（55 个教程/视频）

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ESP32 Tutorial 45/55 - Custom Streamign Server with LED control CAM-3 l SunFounder's ESP32 Learning kit

In this tutorial, we'll explore how to set up a custom streaming server using the ESP32 extension board from SunFounder. The project allows you to stream live video to your browser while also controlling an LED directly from the interface. This combination of features enables a hands-on learning experience with IoT and web technologies.

We'll be using the ESP32's built-in Wi-Fi capabilities to create a web server that streams video and handles LED control commands. The project involves coding, wiring, and understanding how the components interact. If you want a clearer understanding of the setup, be sure to check out the video at (in video at 00:00).

Hardware Explained

The main components for this project include the ESP32 microcontroller, a camera module, an LED, and a resistor. The ESP32 is a versatile microcontroller with built-in Wi-Fi and Bluetooth, making it perfect for IoT applications. The camera module allows us to capture video, while the LED provides a simple output device for control.

The LED is connected through a resistor to limit the current, preventing damage to both the LED and the microcontroller. This setup will allow us to turn the LED on and off via our web interface, showcasing the capabilities of the ESP32 in handling inputs and outputs over a network.

Datasheet Details

Manufacturer	Espressif
Part number	ESP32-WROOM-32
Logic/IO voltage	3.3 V
Supply voltage	3.0–3.6 V
Output current (per channel)	12 mA
Peak current (per channel)	40 mA
PWM frequency guidance	1 kHz
Input logic thresholds	0.2 V (low) / 0.8 V (high)
Voltage drop / R_DS(on) / saturation	0.2 V (typ.)
Thermal limits	Maximum junction temperature: 125 °C
Package	QFN48
Notes / variants	Available in various configurations

Ensure the ESP32 is powered with a regulated 3.3 V supply.
Use a current-limiting resistor (220 Ohm) with the LED to prevent damage.
Maintain proper connections to avoid floating inputs.
Check Wi-Fi credentials are correct and case-sensitive.
Use a stable power source for consistent performance.
Consider heat dissipation in enclosed spaces.

Wiring Instructions

To wire the ESP32 and the LED, start by connecting the longer pin of the LED to a suitable GPIO pin, in this case, we will use pin 14. The shorter pin should connect to the ground line on your breadboard. Next, place a 220 Ohm resistor in series with the LED, connecting one end to the GPIO pin (pin 14) and the other end to the ground. Ensure that the ESP32 is powered correctly, either through the micro USB port or with a 18650 lithium battery.

For the camera module, make sure to connect the necessary pins according to the camera model you are using, as the wiring may slightly vary. The ESP32 will handle the video stream via its built-in capabilities, and the LED control will be managed through the web interface we will set up in the code.

Code Examples & Walkthrough

The program begins by including necessary libraries and defining the Wi-Fi credentials. You will need to replace ssid and password with your actual Wi-Fi credentials to connect the ESP32 to your network.

const char* ssid = "SSID";
const char* password = "PASSWORD";

Next, we define the LED pin and set up the camera configurations. The pin used for the LED is defined as LED_PIN, which will be used later in the code to control the LED's state.

#define LED_PIN    14
pinMode(LED_PIN, OUTPUT);

In the request handler for the LED control, we check the command received from the web interface. Depending on whether the command is "on" or "off", we use digitalWrite(LED_PIN, 1); to turn the LED on and digitalWrite(LED_PIN, 0); to turn it off.

if(!strcmp(variable, "on")) {
  Serial.println("ON");
  digitalWrite(LED_PIN, 1);
}
else if(!strcmp(variable, "off")) {
  Serial.println("OFF");
  digitalWrite(LED_PIN, 0);
}

This logic allows the web interface to communicate effectively with the ESP32, enabling real-time control of the LED based on user interactions. The full code loads below the article for further exploration.

Demonstration / What to Expect

Once everything is set up and the code is uploaded, you should be able to access the ESP32's IP address in your web browser. The streaming video will appear, and you can control the LED using the buttons on the interface. Clicking "ON" will light up the LED, while "OFF" will turn it off. Make sure that the ESP32 and your computer are connected to the same network to ensure proper functionality (in video at 12:30).