Temperature Monitor GUI Using Processing [PDF]

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DECLARATION

I hereby declare the following article and all the content associated with it to be my own original work. I am submitting it for publication in Electronics for You magazine.

Deepankar Maithani

Temperature Monitor GUI and voice alerts using Processing & Arduino. Arduino Introduction Processing is a languagee and a development environment used by artists, designers, researchers and hobbyists to create amazing visual arts and software. It is built on top of java, and it has something for everyone no matter which domain of software development you fall into. It has various modes to cater the needs of different domains of development like android mode, python mode, JavaScript mode. These modes lets you use the prior knowledge of that language and additional processing specific syntax to create innovative and intuitive software. software Many people don't know but Arduino IDE has come out from processing. Hence it can be seamlessly integrated into any Arduino project. This article will go through the process to create a GUI for displaying the temperature from a LM35 sensor on the GUI and give voice warnings when the temperature is above a certain limit. The wiring of LM35 with the Arduino rduino is shown in figure. figure Below is the snapshot of the GUI. There are two software involved in this project one is written in processing language and the other one is written in Arduino. The Arduino is monitoring the output pin of the LM35 and using the data obtained it is calculating ambient temperature. Then it is sending the value on the Serial port to which it is connected. The processing software listens to the data coming on the port and then displays it on the GUI. It also checks the value of temperature if the temperature is below 40 the he green LED glows else red LED glows and a warning audio is pl played.

Software Arduino Source Code int val;

// variable to store analog value

int tempPin = A0; // giving name to temp pin float temperature; void setup() { Serial.begin(9600);

// start serial at 9600 baud rate

} void loop() { val = analogRead(tempPin); temperature = (val * 4.88)/10;

//multiplication factor to convert the value into ambient temp.

Serial.println(temperature); delay(1000); }

// delay of 1s so that the serial doesn’t runs mad

Explanation: Using its 10 bit ADC Arduino is monitoring the output of the LM35 through the A0 pin. Then it do multiplication and division by a certain factor to give the actual temperature as shown below. temperature = (val * 4.88)/10;

//multiplication factor to convert the value

into temp.

The ADC on the Arduino gets a 5v as reference by default. So in order to calculate the step size Stepsize= Vref/2^n n=no of bits Here we have a 10bit ADC on Arduino. Stepsize= 5/1024 =0.0048828 = 4.88mV from data sheet of LM35 we know for every 1 degree C rise there is increase of 10mv in the output. Hence temperature= (val*4.88mV)/10mv.

Processing Source code

// This software is written by DeepankarMaithani. The code is // is tested on PROCESSING 3.0 (REV 0246) - 30 September 2015 importddf.minim.*;// this library handles the audio file playback importprocessing.serial.*; // this library handles the serial talk Serial myPort; // Create object from Serial class String data="" ; // empty string to gather the temperature values floatConvertedData=0; PFontmyFont; // object from the font class booleanstateChange=true; // Boolean for storing the state Minim minim; //object from minim class AudioSample warning; // a name is assigned to the audio sample AudioSample safe; void setup()// this runs just once { size(500,500); // size of processing window background(0);// setting background color to black myPort = new Serial(this, "COM12", 9600);// giving parameters to object of serial class,put the com to which your arduino is connected and the baud rate myPort.bufferUntil('\n');// gathers data till new line character myFont=loadFont("Arial-Black-48.vlw");// font type see the data folder of your sketch textFont(myFont,70);// font size minim = new Minim(this); //we pass this to Minim so that it can load files from the data directory ////////////////audio samples//////////////////////// warning = minim.loadSample("tempWar.mp3");// A .mp3 file is loaded to the audiosample named warning safe=minim.loadSample("tempSafe.mp3"); // A .mp3 file is loaded to the audiosample named safe } void draw() { background(0);//refreshing background everytime the draw runs noStroke();// disable drawing the outline of text textAlign(CENTER);// align text to the centre of coordinates fill(255);// fill white color to text text(data,410,155);// display the data at 350,155 coordinate textSize(40); // size of text fill(#4B5DCE);// fillin blue color on the text

text("Temp. Reading",180,150);// write text "Temp. Reading" at the coordinates 180,150 noFill();//the upcoming rect will not have anything inside strokeWeight(2); stroke(#4B5DCE);// color of boader of rectangle rect(5,100,470,80); //rectangle Led(); } Void serialEvent(Serial myPort)// whenever serial event happens it runs { data=myPort.readStringUntil('\n'); //gathering data from pot in a variable ConvertedData=parseFloat(data);// converting string into float ; } void Led() { strokeWeight(5);// thickness of outline stroke(255);// white color outline around LED fill(#67F50A); // ellipse(180,240,55, 55);// green LED fill(#CE6668); ellipse(280,240,55, 55); // Red LED if(ConvertedData>40) { fill(#AED691);// green dull ellipse(180,240,55, 55); fill(#FC0004);// red bright ellipse(280,240,55, 55); if(stateChange==true) { warning.trigger(); println("Warning is given out");// for debugging stateChange=false; // this Boolean takes care that the audio is played only when temperature comes down from the threshold. } } if(ConvertedDataimportlibrary>Serial I/O and Sketch>import library>minim. The minim library doesnot come preinstalled it needs to be downloaded first by going to sketch>importlibrary>add and then search for minim in the search tab. The code within setup() runs once and sets the size of GUI window and loads the essential dependencies. The code inside the draw loop runs again and again repeatedly. The serialEvent() function is called every time data comes on the serial port. Processing reads it as string and stores it in variable named data. The LED function takes care of turning on the RED or green LED based on the value of temperature. If the value is less than 40*c green LED is on while when temperature exceeds 40*c the red LED glows. It also plays the warning audio. The hash code for colors can be obtained by going to tools>colorselector. And the font used in the GUI should be selected from tools>createfont. Save the sketch before running it and audio files to be played and font used should be inside the data folder of sketch. The application can also be exported to run as a stand alone app for Windows,Mac or Linux platforms by going to file>exportapplication. Then chose the platform for which you want to export and click Ok. The IDE will give you an exported application.

Note: Video of project is attached in the mail Deepankar Maithani