# Kombi Thingspeak und SCD30

/*
  WriteMultipleFields
  
  Description: Writes values to fields 1,2,3,4 and status in a single ThingSpeak update every 20 seconds.
  
  Hardware: ESP8266 based boards
  
  !!! IMPORTANT - Modify the secrets.h file for this project with your network connection and ThingSpeak channel details. !!!
  
  Note:
  - Requires ESP8266WiFi library and ESP8622 board add-on. See https://github.com/esp8266/Arduino for details.
  - Select the target hardware from the Tools->Board menu
  - This example is written for a network using WPA encryption. For WEP or WPA, change the WiFi.begin() call accordingly.
  
  ThingSpeak ( https://www.thingspeak.com ) is an analytic IoT platform service that allows you to aggregate, visualize, and 
  analyze live data streams in the cloud. Visit https://www.thingspeak.com to sign up for a free account and create a channel.  
  
  Documentation for the ThingSpeak Communication Library for Arduino is in the README.md folder where the library was installed.
  See https://www.mathworks.com/help/thingspeak/index.html for the full ThingSpeak documentation.
  
  For licensing information, see the accompanying license file.
  
  Copyright 2018, The MathWorks, Inc.
*/
#include <Wire.h>
#include "SparkFun_SCD30_Arduino_Library.h" //Click here to get the library: http://librarymanager/All#SparkFun_SCD30
SCD30 airSensor;
#include "ThingSpeak.h"
#include "secrets.h"
#include <ESP8266WiFi.h>

char ssid[] = SECRET_SSID;   // your network SSID (name) 
char pass[] = SECRET_PASS;   // your network password
int keyIndex = 0;            // your network key Index number (needed only for WEP)
WiFiClient  client;

unsigned long myChannelNumber = SECRET_CH_ID;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;

// Initialize our values
int number4 = 12;
String myStatus = "";

void setup() {
  Serial.begin(115200);  // Initialize serial
  Serial.println("SCD30 Example");
  Wire.begin();
  WiFi.mode(WIFI_STA); 
  ThingSpeak.begin(client);  // Initialize ThingSpeak
if (airSensor.begin() == false)
  {
    Serial.println("Air sensor not detected. Please check wiring. Freezing...");
    while (1)
      ;
  }

  airSensor.setMeasurementInterval(4); //Change number of seconds between measurements: 2 to 1800 (30 minutes)

  //My desk is ~1600m above sealevel
  airSensor.setAltitudeCompensation(1600); //Set altitude of the sensor in m

  //Pressure in Boulder, CO is 24.65inHg or 834.74mBar
  airSensor.setAmbientPressure(835); //Current ambient pressure in mBar: 700 to 1200

  float offset = airSensor.getTemperatureOffset();
  Serial.print("Current temp offset: ");
  Serial.print(offset, 2);
  Serial.println("C");

  //airSensor.setTemperatureOffset(5); //Optionally we can set temperature offset to 5°C
}

void loop() {

  // Connect or reconnect to WiFi
  if(WiFi.status() != WL_CONNECTED){
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(SECRET_SSID);
    while(WiFi.status() != WL_CONNECTED){
      WiFi.begin(ssid, pass);  // Connect to WPA/WPA2 network. Change this line if using open or WEP network
      Serial.print(".");
      delay(5000);     
    } 
    Serial.println("\nConnected.");
  }
  
  if (airSensor.dataAvailable())
  {
    Serial.print("co2(ppm):");
    Serial.print(airSensor.getCO2());

    Serial.print(" temp(C):");
    Serial.print(airSensor.getTemperature(), 1);

    Serial.print(" humidity(%):");
    Serial.print(airSensor.getHumidity(), 1);

    Serial.println();
    
  }
  else
    Serial.print(".");

  delay(1000);

  // set the fields with the values
  ThingSpeak.setField(1, airSensor.getCO2());
  ThingSpeak.setField(2, airSensor.getTemperature());
  ThingSpeak.setField(3, airSensor.getHumidity());
  ThingSpeak.setField(4, number4);

  // set the status
  ThingSpeak.setStatus(myStatus);
  
  // write to the ThingSpeak channel
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if(x == 200){
    Serial.println("Channel update successful.");
  }
  else{
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }
  
  // change the values
  
  delay(20000); // Wait 20 seconds to update the channel again
}

## secrets.h von Jörg (WLAN und Thingspeak-API)

// Use this file to store all of the private credentials 
// and connection details

#define SECRET_SSID "Jorgs-iMac"		// replace MySSID with your WiFi network name
#define SECRET_PASS "12341007"	// replace MyPassword with your WiFi password

#define SECRET_CH_ID 1165964			// replace 0000000 with your channel number
#define SECRET_WRITE_APIKEY "XFH8DFHAA2TVH48K"   // replace XYZ with your channel write API Key

## Public View Thingspeak
https://thingspeak.com/channels/1165964