EnvMonitor/src/main.cpp

#include <Arduino.h>
#include <WiFiClient.h>
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <EEPROM.h>
#include <DHT.h>

#define DHTPIN 0
#define DHTTYPE DHT22
DHT dht22(DHTPIN, DHTTYPE); // <-- Global object
#define ledPin 2
int wifiConnectStatus = 0; //WiFi connection status

WiFiServer server(80);

void loadWiFiSettings(char* ssid, char* password) { //Read WiFi settings from EEPROM
  EEPROM.begin(64); //Initialize EEPROM with size 64 bytes
  for (int i = 0; i < 32; i++) {
   char c = EEPROM.read(i);
  //  Serial.print(c);
  //  Serial.print(" ");
  //  Serial.print((int)c);
  //  Serial.print("  ");
   ssid[i] = c;
   if(c =='\0'){
    break;
   }
  }
  for (int i = 0; i < 32; i++) {
   char c = EEPROM.read(i + 32);
  //  Serial.print(c);
  //  Serial.print(" ");
  //  Serial.print((int)c);
  //  Serial.print("  ");
   password[i] = c;
   if(c == '\0'){
    break;
   }
  }
  EEPROM.end();
}

void saveWiFiSettings(const char ssid[32], const char password[32]) {
  EEPROM.begin(64); //Initialize EEPROM with size 64 bytes
  for(int i=0; i<32; i++) {
    // Serial.print(ssid[i]);
    // Serial.print(" ");
    // Serial.print((int)ssid[i]);
    EEPROM.write(i, ssid[i]); //Write SSID to EEPROM
    // Serial.print(ssid[i]);
    if(ssid[i] == '\0') {
      break;
    }
  }
  for(int i=0; i<32; i++) {
    // Serial.print(password[i]);
    // Serial.print(" ");
    // Serial.print((int)password[i]);
    EEPROM.write(i+32, password[i]); //Write Password to EEPROM
    // Serial.print(password[i]);
    if(password[i] == '\0') {
      break;
    }
  }
  Serial.println("EEPROM.end");
  EEPROM.end();
}

int connectWiFi(const char* ssid, const char* password) { //Connect to WiFi
  WiFi.begin(ssid,password);
  while(WiFi.status() !=WL_CONNECTED){ // Wait for WiFi connection || Blink LED while connecting
    digitalWrite(ledPin,LOW); // Turn on LED
    delay(250);
    Serial.println(".");
    digitalWrite(ledPin,HIGH);// Turn off LED
    delay(250);
  }
  wifiConnectStatus = 1;
  return (wifiConnectStatus); // Return Connected status when WiFi is connected
}

void setup() {
  Serial.begin(115200);
  Serial.println("");
  Serial.println("Environment Monitoring System - ESP8266 Firmware Ver.1.0.0.stable");
  Serial.println("Developed by Madobi Nanami");
  Serial.println("Personal site: https://nanami.tech");
  Serial.println("Tech support & Feedback: yzt114@yeah.net");
  dht22.begin();
  EEPROM.begin(64);
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
  char ssid[32];
  char password[32];
  loadWiFiSettings(ssid, password); //Load WiFi settings from EEPROM
  if(strlen (ssid) == 0 || strlen (password) == 0) { //If no WiFi settings found, set default values
    Serial.println("No WiFi settings found in EEPROM, please set WiFi settings.");
    Serial.println("Please enter WiFi SSID:");
    while(!Serial.available());
    String input_ssid = Serial.readStringUntil('\n');
    input_ssid.trim(); // Remove any leading/trailing whitespace
    if (input_ssid.length() > 32) {
      Serial.println("SSID is too long, please enter a valid SSID (max 32 characters).");
      return;
    }
    Serial.println("Please enter WiFi Password:");
    while(!Serial.available());
    String input_password = Serial.readStringUntil('\n');
    input_password.trim(); // Remove any leading/trailing whitespace
    if (input_password.length() > 32) {
      Serial.println("Password is too long, please enter a valid password (max 32 characters).");
      return;
    }
    if (int(connectWiFi(input_ssid.c_str(), input_password.c_str())) == 1) {
      saveWiFiSettings(input_ssid.c_str(), input_password.c_str()); //Save WiFi settings to EEPROM
      Serial.println("WiFi settings saved to EEPROM.");
    } else {
      Serial.println("Failed to connect to WiFi, please check your SSID and Password.");
      return;
    }
  } else {
    Serial.print("Loaded WiFi SSID: ");
    Serial.println(ssid);
    Serial.print("Loaded WiFi Password: ");
    Serial.println(password);
    if (connectWiFi(ssid, password) == 1){
      Serial.println("Connected to WiFi successfully.");
      Serial.print("IP Address: ");
      Serial.println(WiFi.localIP());
      server.begin();
      digitalWrite(ledPin, LOW); // Turn on LED after connection
    } //Connect to WiFi with loaded settings
  }
}

void loop() {
  String user_command;
  WiFiClient client; // Declare client at the start
  if(server.hasClient()) { // Check if there is a client connected
    Serial.println("A new client connected to web server.");
    server.setNoDelay(true);
    client = server.available(); // Assign client here
    if(client) {
      Serial.println("New client connected.");
      String currentLine = "";
      while(client.connected()) {
        if(client.available()) {
          char c = client.read();
          Serial.write(c);
          if(c == '\n') {
            currentLine.trim(); // Remove whitespace
            user_command = currentLine;
            Serial.printf("Received command: %s\n", user_command.c_str());
          }
        }
      }
    }
  }
  if (user_command == "temp.read") {
    float temperature = dht22.readTemperature();
    client.println(temperature);
    Serial.printf("Temperature: %.2f °C\n", temperature);
    user_command = ""; // Clear command after processing
  }
  if (user_command == "hum.read") {
    float humidity = dht22.readHumidity();
    client.println(humidity);
    Serial.printf("Humidity: %.2f %%\n", humidity);
    user_command = ""; // Clear command after processing
  }
}