Good evening all,

I am trying to send data to ThingSpeak using a Makerfabs 4g LTE and arduino IDE.

Makerfabs board: https://www.makerfabs.com/maduino-zero-4g-lte-sim7600.html
Sensor: Ultrasonic sensor SEN0311.

Using the code from https://how2electronics.com/http-post-with-sim7600-arduino-send-data-to-server/, I have managed to send temp and humidity data (from a DTH11) to Thingspeak. Also copied below (note, I have added my Thingspeak API in my code).

I have got the SEN0311 working on my arduino UNO R3 using the code from https://wiki.dfrobot.com/_A02YYUW_Waterproof_Ultrasonic_Sensor_SKU_SEN0311 (also below), but I cannot get it to work on the Makerfabs board. I receive the error message “Compilation error: SoftwareSerial.h: No such file or directory”.

I would be super grateful if this community could help me answer 2 questions please:

1. How do I get the SEN0311 working on Makerfabs board? Is it possible or is it a hardware issue?
2. How do I integrate these codes to send the SEN0311 data to thingspeak?

Thank you in advance for your help.

CODE 1: Send DHT11 data to thingspeak:

#include <stdio.h>
#include <string.h>
#include <DHT.h>
 
//Change the API key to yours
String Apikey = "XXXXXXXXXX";
 
#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","wap.vodafone.co.uk"", 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 + ""rn";
    SerialUSB.println(http_str);
 
    sendData("AT+HTTPINITrn", 2000, DEBUG);
    sendData(http_str, 2000, DEBUG);
    sendData("AT+HTTPACTION=0rn", 3000, DEBUG);
    sendData("AT+HTTPTERMrn", 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;

**CODE 2: SEN0311 on Arduino UNO. **

#include <SoftwareSerial.h>

SoftwareSerial mySerial(11,10); // RX, TX
unsigned char data[4]={};
float distance;

void setup()
{
 Serial.begin(57600);
 mySerial.begin(9600); 
}

void loop()
{
    do{
     for(int i=0;i<4;i++)
     {
       data[i]=mySerial.read();
     }
  }while(mySerial.read()==0xff);

  mySerial.flush();

  if(data[0]==0xff)
    {
      int sum;
      sum=(data[0]+data[1]+data[2])&0x00FF;
      if(sum==data[3])
      {
        distance=(data[1]<<8)+data[2];
        if(distance>30)
          {
           Serial.print("distance=");
           Serial.print(distance/10);
           Serial.println("cm");
          }else 
             {
               Serial.println("Below the lower limit");
             }
      }else Serial.println("ERROR");
     }
     delay(100);
}

I was able to send temp and humidity data to thingspeak. I plugged the SEN0311 to the Makerfabs board (Black > GND, Red > 3.3v, Green > 11, Blue > 10) and was expecting to use the same code that worked for the arduino UNO.