#ESP32CAM – Running a WebServer to Flash On 🔦🔦🔦 in the #Arduino board

Hi !

Still learning with the ESP32 CAM board.

In today’s post the scenario is simple:

• Connect the device to a WiFi network
• Run a webserver on the device and create an endpoint [/flash]
• Turn on the Flash for 1 second when the endpoint receives a request.

As the previous sample, I’ll write this using Visual Studio Code and PlatformIO project, using the AI Thinker ESP-32CAM board.

Full project working demo

Let’s review some noted from the code:

As usual, we need to define the WiFi credentials in the main.cpp file.

// Replace with your network credentials
const char *ssid = "IoTLabs2";
const char *password = "12345678";

The function [flashOnForNSeconds] turns the Flash ON for N seconds.

// ledPin refers to ESP32-CAM GPIO 4 (flashlight)
#define FLASH_GPIO_NUM 4

void flashOnForNSeconds(int seconds)
{
  digitalWrite(FLASH_GPIO_NUM, HIGH);
  delay(seconds * 1000);
  digitalWrite(FLASH_GPIO_NUM, LOW);
}

Once the device is connected, a new endpoint [/flash] is created and it will trigger the Flash for 1 second.

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

  // Route for trigger flash
  server.on("/flash", HTTP_GET, [](AsyncWebServerRequest *request)
            {
              flashOnForNSeconds(1);
              request->send_P(200, "text/plain", "Flash Triggered"); });

  // Start server
  server.begin();

And tha’t basically it ! Once we know the IP for our device, we can make the HTTP call.

Full code available in my ESP32 Cam Demo repository.