ThingSpeak with SIM900 and DHT11 sensor

Other Hardware Home Automation
1

I am trying to send data from DHT11 Sensor to Thingspeak using SIM900. I am able to send data(temperature) to one field of Thingspeak. However my humidity chart is getting updated. I am unsure as to how to modify the code for that to happen. Also, how do I change the time scale on Thingspeak? This is my code:
I have also attached a picture of my Thingspeak channel

#include <SoftwareSerial.h>
#include <String.h>

SoftwareSerial mySerial(7, 8);

#include <Adafruit_Sensor.h>
#include <DHT.h>
//#include <DHT_U.h>

#define DHTPIN 2 // Pin which is connected to the DHT sensor.

float temp=0.0;
float humidity=0.0;

// Uncomment the type of sensor in use:
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT21 // DHT 21 (AM2301)

// See guide for details on sensor wiring and usage:
// Overview | DHT11, DHT22 and AM2302 Sensors | Adafruit Learning System

DHT dht(DHTPIN, DHTTYPE);

uint32_t delayMS;

void setup()
{
mySerial.begin(9600); // the GPRS baud rate
Serial.begin(9600); // the GPRS baud rate
}

void loop()
{
temp=dht.readTemperature();
humidity=dht.readHumidity();
Serial.println(String(temp)+"*C\t"+String(humidity)+"%");
delay(2);
Send2Pachube();

if (mySerial.available())
Serial.write(mySerial.read());
}
void Send2Pachube()
{
mySerial.println("AT");
delay(1000);

mySerial.println("AT+CPIN?");
delay(1000);

mySerial.println("AT+CREG?");
delay(1000);

mySerial.println("AT+CGATT?");
delay(1000);

mySerial.println("AT+CIPSHUT");
delay(1000);

mySerial.println("AT+CIPSTATUS");
delay(2000);

mySerial.println("AT+CIPMUX=0");
delay(2000);

ShowSerialData();

mySerial.println("AT+CSTT="internet"");//start task and setting the APN,
delay(1000);

ShowSerialData();

mySerial.println("AT+CIICR");//bring up wireless connection
delay(3000);

ShowSerialData();

mySerial.println("AT+CIFSR");//get local IP adress
delay(2000);

ShowSerialData();

mySerial.println("AT+CIPSPRT=0");
delay(3000);

ShowSerialData();

mySerial.println("AT+CIPSTART="TCP","api.thingspeak.com","80"");//start up the connection
delay(6000);

ShowSerialData();

mySerial.println("AT+CIPSEND");//begin send data to remote server
delay(4000);
ShowSerialData();

String str1="GET http://api.thingspeak.com/update?api_key=2YEHVB0FC87OUPTX&field1=" + String(temp);

String str2="GET http://api.thingspeak.com/update?api_key=2YEHVB0FC87OUPTX&field2=" + String(humidity);
mySerial.println(str1);//begin send data to remote server
delay(4000);
ShowSerialData();
mySerial.println(str2);
delay(4000);
ShowSerialData();

mySerial.println((char)26);//sending
delay(5000);//waitting for reply, important! the time is base on the condition of internet
mySerial.println();

ShowSerialData();

mySerial.println("AT+CIPSHUT");//close the connection
delay(100);
ShowSerialData();
}
void ShowSerialData()
{
while(mySerial.available()!=0)
Serial.write(mySerial.read());
}

Capture.JPG
Capture.JPG1342×640 47.6 KB

2

*Humidity chart is NOT getting updated

3

You forget to start the sensor in the setup.
Try like this:

void setup()
  {
    mySerial.begin(9600);               // the GPRS baud rate   
    Serial.begin(9600);    // the GPRS baud rate
    dht.begin(); //Se inicia el sensor
  }