Wokwi - Online ESP32, STM32, Arduino Simulator

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int batPin = 35, loadPin = 32, voltPin = 34;
const float sensitivity = 0.066, dividerRatioBat = 19.8 / 3.3, dividerRatioSensor = 5 / 3.3;
const float zeroCurrentVoltageB = 2.3, zeroCurrentVoltageL = 2.3;
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Wi-Fi credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// Initialize Wi-Fi and server
WiFiServer server(80);

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  // Start the server
  server.begin();
}

void loop() {
  float voltBat = (readPin(voltPin) + 0.166) * dividerRatioBat;
  float powerBat = (readPin(batPin) * dividerRatioSensor - zeroCurrentVoltageB) / sensitivity;
  float powerLoad = (readPin(loadPin) * dividerRatioSensor - zeroCurrentVoltageL) / sensitivity;
  float powerTotal = max(powerBat + powerLoad, 0.0f);
  float wattTotal = max(voltBat * powerTotal, 0.0f);
  float wattLoad = max(voltBat * powerLoad, 0.0f);
  powerLoad = max(powerLoad, 0.0f);

  lcd.setCursor(0, 0);
  lcd.printf("%4.1fV %4.1fA %3.0fW", voltBat, powerTotal, wattTotal);

  lcd.setCursor(0, 1);
  lcd.printf("%4.1f%s %4.1fA %3.0fW", powerBat < 0 ? -powerBat : powerBat, powerBat < 0 ? "D" : "C", powerLoad, wattLoad);

  webServer();
  delay(1000);
}

void webServer() {
  // Handle incoming client requests
  WiFiClient client = server.available();
  if (client) {
    Serial.println("New client connected");
    String request = "";
    while (client.connected() || client.available()) {
      if (client.available()) {
        char c = client.read();
        request += c;
        if (c == '\n') {
          if (request.startsWith("GET / ")) {
            client.println("HTTP/1.1 200 OK");
            client.println("Content-Type: text/html");
            client.println("Connection: close");
            client.println();
            client.println(generateHTML());
          }
          break;
        }
      }
    }
    client.stop();
    Serial.println("Client disconnected");
  }
}

String generateHTML() {
  // Use the already calculated values to generate the HTML
  String html = R"rawliteral(
<!DOCTYPE html>
<html>
<head>
  <title>ESP32 Monitor</title>
</head>
<body>
  <h1>Battery Voltage: )rawliteral" + String(voltBat, 1) + R"rawliteral(V</h1>
  <h2>Total Power: )rawliteral" + String(powerTotal, 1) + R"rawliteral(A</h2>
  <h2>Total Wattage: )rawliteral" + String(wattTotal, 0) + R"rawliteral(W</h2>
  <h2>Battery Current: )rawliteral" + String(powerBat < 0 ? -powerBat : powerBat, 1) + (powerBat < 0 ? "D" : "C") + R"rawliteral(</h2>
  <h2>Load Current: )rawliteral" + String(powerLoad, 1) + R"rawliteral(A</h2>
  <h2>Load Wattage: )rawliteral" + String(wattLoad, 0) + R"rawliteral(W</h2>
</body>
</html>
)rawliteral";

  return html;
}

float readPin(int pin) {
  return analogRead(pin) * 3.3 / 4095.0;
}