Published April 5, 2016 © CC0

Arduino YUN IoT for Home monitoring using dweet.io

Practicing with IoT using dweet.io service from YUN.

BeginnerProtip2 hours4,380

Arduino YUN IoT for Home monitoring using dweet.io

Things used in this project

Hardware components

Arduino Yun

http://dweet.io/

LM35

Resistor 10k ohm

LDR

Story

Use of the httpclient library to create a "thing" in dweet.io using an Arduino YUN.

YUN with the protoype PCB showing LM35, the LDR and 2 off 10kOhm resisors

PCB

/* LDR CONECTION.
----------------------------------------------------
         LDR 10K     10K
+5 o---/\/\/--.--/\/\/---o GND
                                |
 A0 o---------'
----------------------------------------------------
LM35 CONNECTION

Front view of the encapsulation. From left to right.

Pin 1 --> +5V in the YUN
Pin 2 --> Output to the A1 in the YUN.
One 10kOhm resistor from this point to the GND.
Pin 3 --> GND in the YUN

Monitorizing Home from dweet.io

.........................................

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Code

Room monitoring, temperature and light just using the component LM35 and one LDR divider

Room monitoring, temperature and light just using the component LM35 and one LDR divider

Arduino

The input from theLM35 sensor is connected to the Analog input A1, its value is multipled by 0.4689455791989076 to convert it in ºC and proper calibration. One 10KOhm resistor from this point to the GND is needed to stabilize the Reading.
The center point from the divider of 10kOhm resitor and the LDR is connecte to the Analog input A0, its value is mapped from its min and max values meassured with min and max lighting to scale it into a range from 0 to 100, like of the 0 - 100% of the room lighting values.
The Timestamp of the readying is also added.

#include <Bridge.h>
#include <HttpClient.h>
int analogIn = A0; int analogVal = 0; int analogIn1 = A1; int analogVal1 = 0;int light = 0;
float temp;
void setup() {
  // Bridge takes about two seconds to start up
  // it can be helpful to use the on-board LED
  // as an indicator for when it has initialized
  pinMode(13, OUTPUT);
  digitalWrite(13, LOW);
  Bridge.begin();
  digitalWrite(13, HIGH);
}

void loop() {
// Initialize the client library
String dataString;
  analogVal = analogRead(analogIn);analogVal1 = analogRead(analogIn1);
  light=map(analogVal,0,1024,0,100);// To convert Analog values to % of luminosity
  temp=analogVal1*0.4689455791989076; //Sensor Calibration
  HttpClient client;
  dataString += getTimeStamp(); // CAll routine to obtain current timestamp from the linino side of the YUN
  // Make a HTTP request:To send analog input values of A0 and A1
  client.get("http://www.dweet.io/dweet/for/YUN_ANALOG_IN_DWEETING?A0_Home_Light="+String(light)+"&A1_Home_Temp="+String(temp)+"&TimeStamp="+String(dataString)+"&Visit=https://www.hackster.io/Rjuarez7");
  delay(1000); // To give time to the server for answering
}

String getTimeStamp() {
   String result;
   Process time;
   time.begin("date");
   time.addParameter("+%D-%T");  
   time.run(); 
   while(time.available()>0) {
     char c = time.read();
     if(c != '\n')
       result += c;
   }
   return result;
}