CiaoMQTTBluemix

Ciao MQTT Bluemix

This example uses Ciao MQTT connector. The sketch sends via MQTT brightness and temperature information that will be shown graphically on the blueMix IBM system. Upload your sketch and then connect to the webpage: https://quickstart.internetofthings.ibmcloud.com/#/device/BlueMixTest902345/sensor/

Hardware Required

Circuit

There is no circuit for this example.

image developed using Fritzing. For more circuit examples, see the Fritzing project page

Code

/*
Arduino Ciao example

This sketch uses Ciao mqtt connector. Sketch sends via MQTT brightness and temperature information that will be shown graphically in the blueMix IBM system.
Upload your sketch an than connect to the webpage:
https://quickstart.internetofthings.ibmcloud.com/#/device/BlueMixTest902345/sensor/

NOTE: be sure to activate and configure mqtt connector on Linino OS.
http://www.arduino.org/learning/reference/ciao-library

created September 2015
by andrea[at]arduino[dot]org

*/

#include <Ciao.h>

int ctrl=0;
void setup()
{
Ciao.begin(); //Start the serial connection with the computer
//to view the result open the serial monitor
pinMode(9,OUTPUT);
}

void loop() // run over and over again
{
//getting the voltage reading from the temperature sensor
int readingTemp = analogRead(A0);
// converting readingTemp to voltage
float voltage = readingTemp * 4.56;
voltage /= 1024;
// now print out the temperature
float temperatureC = (voltage - 0.5) * 100 ;
int readingLum = analogRead(A2);

analogWrite(9,map(readingLum,0,1023,0,255));

if (ctrl>=10){
Ciao.write("mqtt","iot-2/evt/status/fmt/json","{\"d\": {\"temperature\":"+String(temperatureC)+",\"luminosity\":"+String(readingLum)+"}}");
ctrl=0;
}
ctrl++;
delay(100);

}

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