Sending Data to Things Speak Server With HTTP Post Using SIM7600 and Arduino.

In this project, we will learn how we can send data to things speak server with http post using SIM7600 and Arduino.

In our previous projects, We used SIM800 / SIM900 series of 2G GSM module to send HTTP requests but 2G services is band in most of the European Countries. So, there might be problem in remote monitoring or sending data to server using wireless communications. We can solve this problem by using 4G LTE module SIM7600 and Arduino.

This 4G GSM LTE Module allows you to add voice, text, location-tracking, voice, SMS, and data to your application.One of the big advantage of Sim7600 4G LTE module is its covers a wide range of area and signal/connectivity is available almost everywhere.

In this project,We use Cellular IOT with 4G LTE SIM7600 Modem and Send Data to Server with HTTP Post using SIM7600 LTE module

This project is sponsored by PCBWAY. It is world fastest pcb manufacturing company.

You Will get FREE prototype pcb from PCBWAY. So do not be late to register and place your first order from PCBWAY

If you want to order pcb from PCBWAY . CLICK IN THE LINK BELOW:

https://www.pcbway.com/QuickOrderOnline.aspx?from=electronicsworkshops



We are going to send DHT11 temperature and humidity data to things speak server using SIM7600 and Arduino. We will use HTTP Post method and with SIM7600 AT Commands. In our previous article also we have already tested AT commands for checking HTTP data.

DHT11 temperature and humidity sensor has 3 pins VCC ,GND and Data .

vcc is connected to 3.3 volt.

GND to Ground

Data to D3 pin of the module

#include <stdio.h>
#include <string.h>
#include <DHT.h>
  
//Change the API key to yours
String Apikey = "***************";
  
#define DEBUG true
#define LTE_RESET_PIN 6
#define LTE_PWRKEY_PIN 5
#define LTE_FLIGHT_PIN 7
#define Sensor_PIN 3  //D3-DHT11
  
DHT  dht(Sensor_PIN,DHT11);
  
void setup()
{
    SerialUSB.begin(115200);
    //while (!SerialUSB)
    {
      ; // wait for Arduino serial Monitor port to connect
    }
    Serial1.begin(115200);
   
    //Serial1.begin(UART_BAUD, SERIAL_8N1, MODEM_RXD, MODEM_TXD);
   
    pinMode(LTE_RESET_PIN, OUTPUT);
    digitalWrite(LTE_RESET_PIN, LOW);
   
    pinMode(LTE_PWRKEY_PIN, OUTPUT);
    digitalWrite(LTE_RESET_PIN, LOW);
    delay(100);
    digitalWrite(LTE_PWRKEY_PIN, HIGH);
    delay(2000);
    digitalWrite(LTE_PWRKEY_PIN, LOW);
     
    pinMode(LTE_FLIGHT_PIN, OUTPUT);
    digitalWrite(LTE_FLIGHT_PIN, LOW);//Normal Mode
     
    delay(5000);
  
     
    /*ModuleState = moduleStateCheck();
    if (ModuleState == false) //if it's off, turn on it.
    {
        digitalWrite(PWR_KEY, LOW);
        delay(3000);
        digitalWrite(PWR_KEY, HIGH);
        delay(10000);
        SerialUSB.println("Now turnning the SIM7600 on.");
    }*/
     
  
    sendData("AT+CCID", 3000, DEBUG);
    sendData("AT+CREG?", 3000, DEBUG);
    sendData("AT+CGATT=1", 1000, DEBUG);
    sendData("AT+CGACT=1,1", 1000, DEBUG);
    sendData("AT+CGDCONT=1,\"IP\",\"apn\"", 1000, DEBUG);
  
    //sendData("AT+CIPSTART=\"TCP\",\"www.mirocast.com\",80", 2000, DEBUG);
    SerialUSB.println("4G HTTP Test Begin!");
  
    dht.begin();
    delay(1000);
}
  
void loop()
{
    //--------Get temperature and humidity-------------
    float h = dht.readHumidity();
    float t = dht.readTemperature();
     SerialUSB.print("Humidity: ");
     SerialUSB.print(h);
     SerialUSB.println("%");
     SerialUSB.print("Temperature: ");
     SerialUSB.print(t);
     SerialUSB.println("*C");
     delay(1000);
  
    //-----------HTTP---------------------
    String http_str = "AT+HTTPPARA=\"URL\",\"https://api.thingspeak.com/update?api_key=" + Apikey + "&field1=" + (String)t + "&field2=" + (String)h + "\"\r\n";
    SerialUSB.println(http_str);
  
    sendData("AT+HTTPINIT\r\n", 2000, DEBUG);
    sendData(http_str, 2000, DEBUG);
    sendData("AT+HTTPACTION=0\r\n", 3000, DEBUG);
    sendData("AT+HTTPTERM\r\n", 3000, DEBUG);
  
    delay(5000);  
}
  
bool moduleStateCheck()
{
    int i = 0;
    bool moduleState = false;
    for (i = 0; i < 5; i++)
    {
        String msg = String("");
        msg = sendData("AT", 1000, DEBUG);
        if (msg.indexOf("OK") >= 0)
        {
            SerialUSB.println("SIM7600 Module had turned on.");
            moduleState = true;
            return moduleState;
        }
        delay(1000);
    }
    return moduleState;
}
  
String sendData(String command, const int timeout, boolean debug)
{
  String response = "";
  Serial1.println(command);
   
  long int time = millis();
  while ( (time + timeout) > millis())
  {
    while (Serial1.available())
    {
      char c = Serial1.read();
      response += c;
    }
  }
  if (debug)
  {
    SerialUSB.print(response);
  }
  return response;
}