// Program for esp32 to connect to wifi (broadband)
// created by Jans Hendry
// Universitas Gadjah Mada, Indonesia
// Kamakura Node, Japan
// fab academy MIT - 2022

#include <WiFi.h> // for wifi
#include "ThingSpeak.h" // cloud
#include "dht.h" // sensor

const char* ssid = "Baskom";   // your network SSID (name) 
const char* password = "masukajah";   // your network password

WiFiClient  client; // client object
dht DHT; // create object from sensor

//int numChannel = 3; // number of field
unsigned long waitagain = 100; // msec
unsigned long tdelta = 0;

// variable temperature and humidity
float temper = 0;
float humid = 0;

// API Key for thingspeak
const char * WriteAPIKey = "KDYMEB4XN07UIPC0";
const char * ReadAPIKey = "MBO0T61W0SSTHDVF";
unsigned long channID = 1720749;

// signaling from attiny3216
const int sigFromat = 2;
const int sigToat = 15;
const int sens = 4;

void setup() {
  // Prepare serial2
  Serial.begin(115200); // for computer communication
  WiFi.mode(WIFI_STA); // Initialize WIFI
  ThingSpeak.begin(client);  // Initialize ThingSpeak
  WiFi.disconnect();

  // setup signal
  pinMode(sigFromat, INPUT);
  pinMode(sens, INPUT);
  pinMode(sigToat, OUTPUT);
  digitalWrite(sigToat, LOW);

  while (digitalRead(sigFromat) != HIGH){
    // do nothing
   }
   
  // Connect to wifi
  while (WiFi.status() != WL_CONNECTED){
    WiFi.begin(ssid, password); // input credentials
    Serial.println("Connected");
    delay(100);
  }
    
  delay(500); // delay 0.5 second
}

void loop() {
  if ((millis() - tdelta) > waitagain){
    // read sensor
    float dt = DHT.read11(sens);
    temper = DHT.temperature - 5;
    humid = DHT.humidity - 10;

    // send to cloud
    ThingSpeak.setField(1, temper);
    ThingSpeak.setField(2, humid);
    int dt1 = ThingSpeak.writeFields(channID, WriteAPIKey);

    // display to serial
    Serial.print("temperature:");
    Serial.println(temper);
    Serial.print("humidity:");
    Serial.println(humid);
    tdelta = millis();

    // read data directly from cloud using same micro
    float cloud_temper = ThingSpeak.readLongField(channID, 1, ReadAPIKey);
    int statusCode = ThingSpeak.getLastReadStatus(); 
    Serial.print("Cloud temperature: ");
    Serial.println(cloud_temper);
    if (statusCode == 200){
      if (cloud_temper >= 30){
        digitalWrite(sigToat, HIGH);
      }
      else{
        digitalWrite(sigToat, LOW);
      }
    }
  }
}