Smart Campus Remote Sensing Station

#include <Wire.h>
#include <DFRobot_SGP40.h>
#include <DFRobot_EnvironmentalSensor.h>
#include <WiFi.h>
#include "secrets.h" //this is a local header file created which contains SSID, Pass, API Keys etc. You will need to create this file "secrets.h" and place your SSID and define the variables SECRET_SSID and SECRET_PASS Password there.
#include <ThingSpeak.h>



#if defined(ARDUINO_AVR_UNO)||defined(ESP8266)
#include <SoftwareSerial.h>
#endif


/*NOTES:
SEN0500 Pinout: TX::D3, RX::D2
*/

#define MODESWITCH        /*UART:*/1 /*I2C: 0*/

#if MODESWITCH
#if defined(ARDUINO_AVR_UNO)||defined(ESP8266)
  SoftwareSerial mySerial(/*rx =*/4, /*tx =*/5);
  DFRobot_EnvironmentalSensor environment(/*addr =*/SEN050X_DEFAULT_DEVICE_ADDRESS, /*s =*/&mySerial);
#else
  DFRobot_EnvironmentalSensor environment(/*addr =*/SEN050X_DEFAULT_DEVICE_ADDRESS, /*s =*/&Serial1);
#endif
#else
DFRobot_EnvironmentalSensor environment(/*addr = */SEN050X_DEFAULT_DEVICE_ADDRESS, /*pWire = */&Wire);
#endif



char ssid[] = SECRET_SSID;   // your network SSID (name) 
char pass[] = SECRET_PASS;   // your network password
WiFiClient  client;
DFRobot_SGP40 mySgp40;
unsigned long myChannelNumber = SECRET_CH_ID;
const char* myWriteAPIKey = SECRET_WRITE_APIKEY;


void setup() {
  WiFi.mode(WIFI_STA);   
  ThingSpeak.begin(client);  // Initialize ThingSpeak
  Serial.println("----------------------------------------------");
//LED test
pinMode(2, OUTPUT);
digitalWrite(2, HIGH);
delay(2000); 
digitalWrite(2, LOW);

//START THE EXTREMLEY TOUCHY SEN0500 BREAKOUT BOARD
#if MODESWITCH
  //Init MCU communication serial port
#if defined(ARDUINO_AVR_UNO)||defined(ESP8266)
  mySerial.begin(9600);
#elif defined(ESP32)
  Serial1.begin(9600, SERIAL_8N1, /*rx =*/D3, /*tx =*/D2);
#else
  Serial1.begin(9600);
#endif
#endif
  Serial.begin(115200);
  while(environment.begin() != 0){
    Serial.println(" SEN0500 initialize failed!!");
    delay(1000);
  }
  Serial.println(" SEN0500  initialize success!!");

//CONNECT TO WIFI
  Serial.println("Starting WiFi...");
  WiFi.begin(ssid, pass);
  Serial.print("Connecting to network...");

  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("Connected to network!!!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

//START AND CAL SGP40
  Serial.println("SGP40 is starting, the reading can be taken after 10 seconds...");
  //The preheating time of the sensor is 10s.
  //duration:Initialize the wait time. Unit: millisecond. Suggestion: duration > = 10000 ms
  while(mySgp40.begin(/*duration = */10000) !=true){
    Serial.println("failed to init chip, please check if the chip connection is fine");
    delay(1000);
  }
  Serial.println("sgp40 initialized successfully!");
  Serial.println("----------------------------------------------");
}




void loop() {
//CHECK WIFI STATUS
  if((WiFi.status() != WL_CONNECTED)){
    Serial.println("!!!!!!!!!!!!!!! NETWORK DISCONNECTED !!!!!!!!!!!!!!!");
    digitalWrite(2, LOW);
    WiFi.begin(ssid, pass);
  }
  if((WiFi.status() == WL_CONNECTED)){
    digitalWrite(2, HIGH);
  }



  ThingSpeak.setField(1, environment.getTemperature(TEMP_F));
  ThingSpeak.setField(2, environment.getHumidity());
  ThingSpeak.setField(3, environment.getUltravioletIntensity());
  ThingSpeak.setField(4, environment.getLuminousIntensity());
  ThingSpeak.setField(5, environment.getAtmospherePressure(HPA));
  ThingSpeak.setField(6, environment.getElevation());
  ThingSpeak.setField(7, analogRead(A4));
  ThingSpeak.setField(8, mySgp40.getVoclndex());

  Serial.println("Sensor Scan Successful");

  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));
  }

/*
//PRINT ALL VOC INDEX SGP40 
  Serial.println();
  Serial.print("VOC_Index:");
  Serial.println(mySgp40.getVoclndex());



//PRINT MOISTURE SENSOR READING
  Serial.print("Moisture:");
  Serial.println(analogRead(A4));



//PRINT RESULTS OF ALL SEN0500 SENSORS
  Serial.print("Temp: ");
  Serial.print(environment.getTemperature(TEMP_C));
  Serial.println("C");
  Serial.print("Temp: ");
  Serial.print(environment.getTemperature(TEMP_F));
  Serial.println("F");
  Serial.print("Humidity: ");
  Serial.print(environment.getHumidity());
  Serial.println(" %");
  Serial.print("Ultraviolet intensity: ");
  Serial.print(environment.getUltravioletIntensity());
  Serial.println(" mw/cm2");
  Serial.print("LuminousIntensity: ");
  Serial.print(environment.getLuminousIntensity());
  Serial.println(" lx");
  Serial.print("Atmospheric pressure: ");
  Serial.print(environment.getAtmospherePressure(HPA));
  Serial.println(" hpa");
  Serial.print("Altitude: ");
  Serial.print(environment.getElevation());
  Serial.println(" m");
  Serial.println();
*/



  delay(100000);
}



/*
String moistStatus(){

  int waterlevel = analogRead(A4);
  Serial.print(waterlevel);
  String moist = "";
  if (waterlevel >= 3000){
    moist = "Dry";
  }
  else if (waterlevel < 3000 && waterlevel >= 2000){
    moist = "Damp";
  }
  else if (waterlevel < 2000){
    moist = "Saturated";
  }
  return moist;
}



String vocStatus(){

  int index = mySgp40.getVoclndex();
  Serial.print(index);
  String safeLevel = "";

  if (index <= 100){
    safeLevel = "Very Safe";
  }
  else if (index > 100 && index <= 200){
    safeLevel = "Safe";
  }
  else if (index > 200 && index <= 400){
    safeLevel = "Ventilate";
  }
  else if (index > 400 && index <= 500){
    safeLevel = "Ventilate Immediately";
  }
  else{
    safeLevel = "Error: No Index";
  }
  
  delay(1000);

  return safeLevel;
}
*/