co2-with-hue.ino

/*
  Basic Arduino example for K-Series sensor
  Created by Jason Berger
  Co2meter.com

  Rewritten for WiFi-functionality of an ESP8266
  and connected to a Senseair S8 CO2-sensor
  20151116: Added Philips Hue functionality
  by Markus Ulsass
*/

#include <ESP8266WiFi.h>

const char* ssid     = "yourSSIDHere";
const char* password = "yourPasswordHere";

// const char* host = "192.168.178.42"; // VM Ubunto local IP
// const char* host = "172.16.10.248"; // VM Ubunto local IP
const char* host = "IP.of.your.platform"; // AAL markus1.protonet.info

byte valCo2Status = 0;

byte readCO2[] = {0xFE, 0X44, 0X00, 0X08, 0X02, 0X9F, 0X25};  //Command packet to read Co2 (see app note)
byte response[] = {0, 0, 0, 0, 0, 0, 0}; //create an array to store the response

//multiplier for value. default is 1. set to 3 for K-30 3% and 10 for K-33 ICB
int valMultiplier = 1;

// Philips Hue settings

const char* bridge_ip = "172.16.10.49"; // Hue Bridge IP
const int port = 80;
String user = "3888d6d56bbdd14a78eb87cf131ec0cd";
String light = "2";

// Philips Hue commands

String hue_green = "{\"on\":true, \"sat\":254, \"bri\":64,\"hue\":25500}";
String hue_yellow = "{\"on\":true, \"sat\":254, \"bri\":128,\"hue\":12750}";
String hue_red = "{\"on\":true, \"sat\":254, \"bri\":192,\"hue\":0}";

void setup()
{
  Serial.begin(9600);    //Opens the virtual serial port with a baud of 9600
  Serial.swap();  // Serial on ESP8266 normally connected to GPIO1 (TX) and GPIO3 (RX), swap
  // maps it to GPIO15 (TX) and GPIO13 (RX) which is Pin 8 and 7 on ESPToy

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
}

void sendRequest(byte packet[])
{
  while (!Serial.available()) //keep sending request until we start to get a response
  {
    Serial.write(readCO2, 7);
    delay(50);
  }

  int timeout = 0; //set a timeoute counter
  while (Serial.available() < 7 ) //Wait to get a 7 byte response
  {
    timeout++;
    if (timeout > 10)   //if it takes to long there was probably an error
    {
      while (Serial.available()) //flush whatever we have
        Serial.read();

      break;                        //exit and try again
    }
    delay(50);
  }

  for (int i = 0; i < 7; i++)
  {
    response[i] = Serial.read();
  }
}

unsigned long getValue(byte packet[])
{
  int high = packet[3];                        //high byte for value is 4th byte in packet in the packet
  int low = packet[4];                         //low byte for value is 5th byte in the packet


  unsigned long val = high * 256 + low;              //Combine high byte and low byte with this formula to get value
  return val * valMultiplier;
}

// Function to control Philips Hue light by sending
// a HTTP-PUT

void hueControl(String color) {
  // Serial.print("Connecting to ");
  // Serial.println(bridge_ip);

  // Use WiFiClient class to create TCP connections
  WiFiClient client;

  if (!client.connect(bridge_ip, port)) {
    // Serial.println("Connection failed");
    return;
  }

  // This will send the request to the server
  client.println("PUT /api/" + user + "/lights/" + light + "/state");
  client.println("Host: " + String(bridge_ip) + ":" + String(port));
  client.println("User-Agent: ESP8266/1.0");
  client.println("Connection: close");
  client.println("Content-type: text/xml; charset=\"utf-8\"");
  client.print("Content-Length: ");
  client.println(color.length()); // PUT COMMAND HERE
  client.println();
  client.println(color); // PUT COMMAND HERE

  delay(10);

  // Read all the lines of the reply from server and print them to Serial
  /* while (client.available()) {
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }

  Serial.println();
  Serial.println("Closing connection"); */
}

void loop()
{

  sendRequest(readCO2);
  unsigned long valCO2 = getValue(response);

if (valCO2 <=1000 && valCo2Status != 1) {
  hueControl(hue_green);
  valCo2Status = 1;
} else if (valCO2 >1000 && valCO2<=1500 && valCo2Status != 2) {
  hueControl(hue_yellow);
  valCo2Status = 2; 
} else if (valCO2 >1500 && valCo2Status != 3) {
  hueControl(hue_red );
  valCo2Status = 3;
  }

  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  const int httpPort = 5000;
  if (!client.connect(host, httpPort)) {

    return;
  }
  // We now create a URI for the request
  String url = "/update?status=";
  url += valCO2;
  url += "&location=HardwareDev";

  // This will send the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "Connection: close\r\n\r\n");
  delay(10);

  /*int num = 0;
    String var = "?co2=" + String(valCO2);
    // String var = "{\"rf\":" + String(humidity) + ",\"C\":" + String (celsius) + "}";
    num = var.length();

    // Sending the http post to the host

    client.println("POST /172.16.10.66/co2/ HTTP/1.1");
    client.println("Host: 172.16.10.66");
    client.println("Content-Type: text/plain");
    client.println("Content-Length: " + String(num));
    client.println();
    client.print(var);
    client.println();

    delay(10);*/

  /* Read all the lines of the reply from server and print them to Serial
    while (client.available()) {
    String line = client.readStringUntil('\r');
    Serial.print(line);
    }

    Serial.println();
    Serial.println("closing connection");*/

  // Delay between URL-requests
  // Do not keep the host too busy ;)

  delay(1000);

}