pool-duino.c

#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>        // Include the mDNS library

const char* ssid     = "JJAGD";
const char* password = "";

// Assign output variables to GPIO pins
const int pinHeater = 4;
const int pinPump1 = 5;
const int pinPump2 = 12;
const int pinPump3 = 14;


// Set web server port number to 80
WiFiServer server(80);

// Variable to store the HTTP request
String header;

int heaterState = 0;
int pumpState = 0;
double tempState = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(pinHeater, OUTPUT);
  pinMode(pinPump1, OUTPUT);
  pinMode(pinPump2, OUTPUT);
  pinMode(pinPump3, OUTPUT);

  // Relays are closed HIGH
  digitalWrite(pinHeater, HIGH);
  digitalWrite(pinPump1, HIGH);
  digitalWrite(pinPump2, HIGH);
  digitalWrite(pinPump3, HIGH);

  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  // Begin mDNS so we can discover the device on the network from the client
  if (MDNS.begin("poolduino")) {
    MDNS.addService("http", "tcp", 80);
  }
  
  server.begin();
}


// HTTP Paths
// /heater/0
// /heater/1
// /pump/0
// /pump/1
// /pump/2
// /pump/3

// JSON Response
// { "heater" : 0, "pump" : 0, "temp" : 82.1 }

void loop() {

  // Update mDNS in case something changes (Like our IP)
  MDNS.update();
  
  WiFiClient client = server.available();   // Listen for incoming clients

  if (client) {                             // If a new client connects,
    Serial.println("New Client.");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;

        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type: application/json");
            client.println("Connection: close");
            client.println();

            bool heaterChanged = false;
            bool pumpChanged = false;
            
            // turns the GPIOs on and off
            if (header.indexOf("GET /heater/0") >= 0) {
              heaterState = 0;
              heaterChanged = true;
            } else if (header.indexOf("GET /heater/1") >= 0) {
              heaterState = 1;
              heaterChanged = true;
            } else if (header.indexOf("GET /pump/0") >= 0) {
              pumpState = 0;
              pumpChanged = true;
            } else if (header.indexOf("GET /pump/1") >= 0) {
              pumpState = 1;
              pumpChanged = true;
            } else if (header.indexOf("GET /pump/2") >= 0) {
              pumpState = 2;
              pumpChanged = true;
            } else if (header.indexOf("GET /pump/3") >= 0) {
              pumpState = 3;
              pumpChanged = true;
            }

            if (heaterChanged) {
              Serial.println("Heater Changed to: " + heaterState);
              digitalWrite(pinHeater, heaterState == 1 ? LOW : HIGH);
            }

            if (pumpChanged) {
              Serial.println("Pump Changed to: " + pumpState);

              // First make sure all pump relays are off
              digitalWrite(pinPump1, HIGH);
              delay(250);
              digitalWrite(pinPump2, HIGH);
              delay(250);
              digitalWrite(pinPump3, HIGH);
              delay(250);

              // Now turn the correct one on:
              if (pumpState == 1) {
                digitalWrite(pinPump1, LOW);
              } else if (pumpState == 2) {
                digitalWrite(pinPump2, LOW);
              } else if (pumpState == 3) {
                digitalWrite(pinPump3, LOW);
              }
            }
            
            // Print back JSON to the client
            client.println("{ \"heater\" : " + heaterState + ", \"pump\" : " + pumpState + ", \"temp\" : " + tempState + " } ");
            
            // The HTTP response ends with another blank line
            client.println();
            // Break out of the while loop
            break;
            
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    
    // Clear the header variable
    header = "";
    
    // Close the connection
    client.stop();
    
    Serial.println("Client disconnected.");
    Serial.println("");
  }

}