Data not show in thingspeak using sim800l

Question

tasya thifali 2022-6-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1731675-data-not-show-in-thingspeak-using-sim800l

回答： Christopher Stapels 2022-6-1

I'm using sim800l and arduino uno for monitoring battery. The code has no error, but data not show in thingspeak. this is the code:

#include <SoftwareSerial.h>
#include <String.h>
SoftwareSerial SIM800L(6,7);                //Serial SIM800L pin
String Write_API_key = "xxxxxxxxxxxxxxxx";  //Thingspeak Write API Key
String apn = "internet";   
int analogPin = A0; // pin arduino yang terhubung dengan pin S modul sensor tegangan
float Vmodul = 0.0; 
float hasil = 0.0;
float R1 = 10000.0; //10k
float R2 = 220.0; //220 ohm resistor, 
float value = 0.0;
int persen = 0;
void setup(){
Serial.begin(115200); 
SIM800L.begin(9600);      
pinMode(analogPin,INPUT);
Serial.println("SIM800L GPRS Test");
delay(2000);
}
void loop(){
SetupModule();
SIM800L.println("AT+CIPSTART=\"TCP\",\"api.thingspeak.com\",\"80\"");
delay(3000);
ShowSerialData();
SIM800L.println("AT+CIPSEND");
delay(2000);
Serial.println();
ShowSerialData();
ReadSensor();
String str="GET https://api.thingspeak.com/update?api_key="+Write_API_key+"&field1=" + String(hasil) +"&field2="+String(persen);
Serial.println(str);  delay(2000);
SIM800L.println(str); delay(4000);
ShowSerialData();
SIM800L.println((char)26); delay(4000); 
SIM800L.println();
ShowSerialData();
SIM800L.println("AT+CIPSHUT");//close the connection
delay(500); 
ShowSerialData();
str="";
//total delay looping 50s
delay(10000); //add 10s for 60s total delay looping 
    } 
    
    void ReadSensor(){
    value = analogRead(analogPin);
    Vmodul = (value * 5) / 1024.0;
    hasil = Vmodul / (R2/(R1+R2));
    persen = (hasil/60)*100;
    
    Serial.print("\t Tegangan Pembagi = ");
    Serial.print(Vmodul,2);
    Serial.print("volt");
    Serial.print("\t Hasil pengukuran asli = ");
    Serial.print(hasil,1);
    Serial.println("volt");
    Serial.print("\t Persentase baterai = ");
    Serial.print(persen);
    Serial.println("%");    
    
    }
    
    void SetupModule(){  
    if (SIM800L.available())Serial.write(SIM800L.read());
        SIM800L.println("AT"); delay(1000);
        SIM800L.println("AT+CPIN?"); delay(1000);
        SIM800L.println("AT+CREG?"); delay(1000);
        SIM800L.println("AT+CGATT?"); delay(1000);
        SIM800L.println("AT+CIPSHUT");delay(1000);
        SIM800L.println("AT+CIPSTATUS"); delay(2000);
        SIM800L.println("AT+CIPMUX=0");  delay(2000);
        
        //setting the APN,
        SIM800L.println("AT+CSTT=\""+apn+"\"");delay(1000);
        ShowSerialData();
        SIM800L.println("AT+CIICR");    delay(2000);
        ShowSerialData();
        
        //get local IP adress
        SIM800L.println("AT+CIFSR");    delay(2000);
        ShowSerialData();
        
        SIM800L.println("AT+CIPSPRT=0");delay(2000);
        ShowSerialData();
        }
        
        void ShowSerialData(){
        while(SIM800L.available()!=0)
            Serial.write(SIM800L.read());
            delay(2000); 
            }

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Answer 1

Christopher Stapels 2022-6-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1731675-data-not-show-in-thingspeak-using-sim800l#answer_975970

Here is a sim 800l example, that the autor says is working. Can you compare to that one and see what is different? There should be something in the serial monitor that indicated what the device is doing.

You might try hard codng a value to write to ThingSpeak (in place of String(hasil)), just to make sure there isnt a problem with your sensor.