// Example 1 - check the chip, flash and PSRAM, then cycle the onboard RGB LED
// Board: ESP32S3 Dev Module | Flash Size: 16MB (128Mb) | PSRAM: OPI PSRAM
// Upload through the CH343P (USB-to-serial) USB-C port, Serial Monitor at 115200 baud

const uint8_t LED_PIN = 48;   // onboard WS2812 RGB LED

void setup() {
  Serial.begin(115200);
  delay(1000);                // give the Serial Monitor a moment to open

  Serial.printf("Chip: %s, %d cores, %lu MHz\n",
                ESP.getChipModel(), ESP.getChipCores(),
                (unsigned long)ESP.getCpuFreqMHz());
  Serial.printf("Flash size: %lu MB\n",
                (unsigned long)(ESP.getFlashChipSize() / (1024 * 1024)));

  if (psramFound()) {
    Serial.printf("PSRAM size: %lu KB\n", (unsigned long)(ESP.getPsramSize() / 1024));
  } else {
    Serial.println("PSRAM not found - set Tools > PSRAM to OPI PSRAM");
  }
}

void loop() {
  rgbLedWrite(LED_PIN, 40, 0, 0);   // red   (0-255, kept low so it is not too bright)
  delay(500);
  rgbLedWrite(LED_PIN, 0, 40, 0);   // green
  delay(500);
  rgbLedWrite(LED_PIN, 0, 0, 40);   // blue
  delay(500);
  rgbLedWrite(LED_PIN, 0, 0, 0);    // off
  delay(500);
}

// Example 2 - Wi-Fi web page that sets the RGB LED colour and shows free PSRAM
// Same Tools settings as Example 1. Your Wi-Fi must be 2.4 GHz.

#include <WiFi.h>
#include <WebServer.h>

const char* WIFI_SSID = "YourNetworkName";   // change to your Wi-Fi name
const char* WIFI_PASS = "YourPassword";      // change to your Wi-Fi password
const uint8_t LED_PIN = 48;                  // onboard WS2812 RGB LED

WebServer server(80);

void setColour(uint8_t r, uint8_t g, uint8_t b) {
  rgbLedWrite(LED_PIN, r, g, b);
}

void handleRoot() {
  if (server.hasArg("c")) {               // e.g. http://<ip>/?c=red
    String c = server.arg("c");
    if (c == "red")        setColour(40, 0, 0);
    else if (c == "green") setColour(0, 40, 0);
    else if (c == "blue")  setColour(0, 0, 40);
    else                   setColour(0, 0, 0);
  }

  String html = "<!DOCTYPE html><html><head>"
                "<meta name='viewport' content='width=device-width, initial-scale=1'>"
                "<title>ESP32-S3 N16R8</title></head>"
                "<body style='font-family:sans-serif; padding:16px'>"
                "<h1>ESP32-S3 N16R8</h1>"
                "<p><a href='/?c=red'>Red</a> | <a href='/?c=green'>Green</a> | "
                "<a href='/?c=blue'>Blue</a> | <a href='/?c=off'>Off</a></p>"
                "<p>Free PSRAM: " + String(ESP.getFreePsram() / 1024) + " KB</p>"
                "<p>Uptime: " + String(millis() / 1000) + " s</p>"
                "</body></html>";
  server.send(200, "text/html", html);
}

void setup() {
  Serial.begin(115200);
  setColour(0, 0, 0);

  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASS);
  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Open this address in your browser: http://");
  Serial.println(WiFi.localIP());

  server.on("/", handleRoot);
  server.begin();
}

void loop() {
  server.handleClient();   // answer browser requests
}