Code for Particle Core/Photon to upload readings from SHT11 to Thingspeak.com

Thingspeak_SHT11_Particle

#define PARTICLE_PHOTON
#include "ThingSpeak/ThingSpeak.h"
#include "SHT1x/SHT1x.h"


//ThingSpeak.com configurations:
TCPClient client;
unsigned long myChannelNumber = REPLACE_WITH_YOUR_CHANNEL_NUMBER;
const char * myWriteAPIKey = "REPLACE_WITH_YOUR_API_KEY";
// Channel 1 is Temperature (deg C)
// Channel 2 is Humidity (%)

//SHT11 Configuration:
#define dataPin  D0
#define clockPin D1
SHT1x sht1x(dataPin, clockPin);


void setup() {
    ThingSpeak.begin(client);
}

void loop() {
    float temp_c;
    float humidity;

    temp_c = sht1x.readTemperatureC();
    humidity = sht1x.readHumidity();
    
    ThingSpeak.setField(1,temp_c);
    ThingSpeak.setField(2,humidity);
    
    ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);  

    delay(20000); // ThingSpeak will only accept updates every 15 seconds. 
}