/* ESP8266_DS18B20_7sg_display_T_speak

   this sketch programs a ESP8266 NodeMCU to:
   measure temperature with a Dallas DS18B20
   display live data on a TM1637 4-digit 7-segment display
   transmit data to a Thingspeak account named DS18B20  -- https//thingspeak.com
   nodeMCU v1.0 (black) programmable via Arduino IDE
   adapted from sketch by shin-ajaran.blogspot.com 
   Floris Wouterlood - 8 August 2018
   Public Domain
*/

   #include <TM1637Display.h>
   #include <WiFi.h>
   #include <OneWire.h>
   #include <DallasTemperature.h>

   #define myPeriodic 60                   // in sec | Thingspeak pub is 60sec
   #define ONE_WIRE_BUS 22                 // DS18B20 arduino pin 16 is the equivalent of NodeMCU pin D0

// DS18B20
   OneWire oneWire(ONE_WIRE_BUS);
   DallasTemperature DS18B20(&oneWire);
   float prevTemp = 0;

// IOT Thingspeaak
   const char* server = "api.thingspeak.com";
   String apiKey ="xxxxxxxxxxxxxxxx";      // fill in the apiKey you received from Thingspeak
   const char* MY_SSID = "wifcarjurnalku";      // your network SSID
   const char* MY_PWD = " wificarjurnalku";      // your network ID  
   int sent = 0;

// TM637 4-digit 7-segment led display
   const int CLK = 18;                     // arduino = 13 equivalent NodeMCU = D7
   const int DIO = 5;                     // arduino = 12 equivalent NodeMCU = D6
   TM1637Display display(CLK, DIO);        // set up the 4-Digit Display.


void setup() {
   Serial.begin(9600);
   clearscreen ();
   delay(200);
   display.setBrightness(0x0a);            // set display to maximum brightness

   delay(200);
   //connectWifi();
  
}

void loop() {
   float temp;
   DS18B20.requestTemperatures(); 
   temp = DS18B20.getTempCByIndex(0);
   Serial.print (String(sent)+" Temperature: ");
   Serial.println (temp);
   display.showNumberDec(temp); 
   sendTemperatureTS(temp);
   int count = myPeriodic;
   while(count--);
   delay(1000);
}

// subroutines

void connectWifi()
{
   Serial.print("Connecting to "+*MY_SSID);
   WiFi.begin(MY_SSID, MY_PWD);
   while (WiFi.status() != WL_CONNECTED) {
      delay(1000);
      Serial.print(".");
   }
   Serial.println("");
   Serial.println("Connected");
   Serial.println("");  
}

void sendTemperatureTS(float temp)
{  
   WiFiClient client;
   if (client.connect(server, 80)) {       // use ip 184.106.153.149 or api.thingspeak.com
   Serial.println("WiFi Client connected ");
   
   String postStr = apiKey;
   postStr += "&field1=";
   postStr += String(temp);
   postStr += "\r\n\r\n";
   
   client.print("POST /update HTTP/1.1\n");
   client.print("Host: api.thingspeak.com\n");
   client.print("Connection: close\n");
   client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
   client.print("Content-Type: application/x-www-form-urlencoded\n");
   client.print("Content-Length: ");
   client.print(postStr.length());
   client.print("\n\n");
   client.print(postStr);
   delay(1000);
   
   }
   sent++;
   client.stop();
}
void clearscreen(){

  uint8_t data []={0x0, 0x0, 0x0, 0x0};
  display.setSegments(data);
  delay (200);  
}