loadCell

#include <ESP8266WiFi.h>
#include<Wire.h>

#include "HX711.h"
#define DOUT  D2
#define CLK  D3
#include "SSD1306.h"
SSD1306 display(0x3c,D2,D3);

String apiKey = "G48TG9O3R13EP3T7";
const char* ssid = "rizkissid";
const char* password = "qwertyuiop";

const char* server = "api.thingspeak.com";

HX711 scale(DOUT, CLK);
float calibration_factor = 550.10;
int GRAM;

WiFiClient client;
void setup() {
  Serial.begin(9600);
  scale.set_scale();
  scale.tare();
  display.init();
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);

  delay(10);
  WiFi.begin(ssid, password);

  while(WiFi.status() !=WL_CONNECTED){
    delay(500);
    Serial.print(".");
  }
  Serial.print("");
  Serial.print("WiFi connected");
}

void loop() {
  display.clear();
  scale.set_scale(calibration_factor);
  GRAM = scale.get_units(), 4;
  if(client.connect(server,80)){
    String postStr = apiKey;
           postStr += "&field1=";
           postStr += String(GRAM);
           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);

           Serial.print("Berat :  ");
           Serial.print(GRAM);
           display.drawString(0, 20,"Berat : ");
           display.drawString(0, 20,String(GRAM));
           Serial.println(" Kirim ke Thingspeak");
           display.drawString(0, 10, "Kirim ke Thingspeak");
           display.display();
  }
  client.stop();

  Serial.println("Waiting .....");

  for(unsigned int i=0; i<20; i++){
    delay(1000);
  }

}