Arduino Projects
Android HMI development- control HMI touch screen using Bluetooth “TFT touch screen”
Table of Contents
Android HMI Development, Description:
Android HMI development– In this tutorial, you will learn how to control a 5 inch TFT HMI touch screen wirelessly using the Hc-05 or Hc-06 Bluetooth module and an android cell phone. This is a dual control system, the relays can be controlled using the HMI touch screen and can also be controlled using your android cell phone.
Any load which is turned on using the HMI touch screen can be turned off using the cell phone application, and any load which is turned on using the android cell phone application can also be turned off using the HMI TFT touch screen.
With the help of this project “Android HMI development” you can also monitor the sensor values on the screen and also in the application.
Android HMI development project is entirely based on my previous three tutorials. In first tutorial, I created one button to control an led and display the on time of a controller in seconds. In this tutorial I covered all the basic functions.
In the second tutorial, I converted two images and then displayed those images on the LCD. This tutorial is really important and explains how Pictures can be displayed on the HMI TFT touch screen.
While in the third tutorial I combined the techniques used in the first two tutorials, the sensor values as you can see on the screen are actually the images which I converted; in the second tutorial, I explained the image conversion in very detail.
So I highly recommend before you start working on the Android HMI development project you should watch my previous three tutorials otherwise you won’t be able to make this project. For the detailed discussion and explanation watch video tutorial given at the end. Without any further delay, let’s get started!!!
Amazon links:
ITDB02 Arduino mega shield 2.1:
*Disclosure: These are affiliate links. As an Amazon Associate I earn from qualifying purchases.
This Android HMI development Project is the modified version of the project which I explained in third tutorial. As you can see the GUI application is exactly the same, I am using the same relay module and the same variable resistor. In this project I made only three changes.
- I added a Bluetooth module with serial port 3.if you don’t know how to use the hc-05 or hc-06 Bluetooth module, then you should watch my getting started tutorial on how to use the Bluetooth module, in which I explained everything in very detail, like for example, how to change the name of the Bluetooth module, how to change the pin code or password etc. You can find this in the related projects section given at the end.
- I made a very little change in the controller programming, so that I can communicate with the HMI touch screen using my android cell phone. So in this project I will not explain the entire program, because I have already explained this program in my third tutorial on HMI touch screen. But I will explain the changes which I made.
- I fixed all the components on the hard board.
Circuit Diagram of Android HMI:
This is the circuit diagram of the relay module, if in case you want to make your own Relay module; otherwise you can purchase a readymade relay Module, Rest of the connections are already explained in my previous tutorials. Watch all the three tutorials given above.
Programming of the HMI Touch Screen:
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#include <UTouch.h> #include <UTouchCD.h> #define TOUCH_ORIENTATION LANDSCAPE #include <UTFT_Buttons.h> #include <UTFT.h> #include <avr/pgmspace.h> #include <SoftwareSerial.h> long int bdata; extern uint8_t SmallFont[]; extern uint8_t BigFont[]; extern uint8_t SevenSegNumFont[]; int button1on = 0; // this will be used as a flag for button1 int button2on = 0;// this will be used as a flag for button2 and so on int button3on = 0; int button4on = 0; int alert1 = 0; // this will be used as a flag int relay1 = 13; int relay2 = 12; int relay3 = 11; int relay4 = 10; int sensor1 = A1; // Sensor connected with A0 of the Mega int x, y; char stCurrent[20]=""; int stCurrentLen=0; char stLast[20]=""; int bg[] = { 0, 0, 255}; int fg[] = { 255, 255, 255}; UTFT myGLCD(ITDB50, 38,39,40,41); // Remember to change the model parameter to suit your display module! UTouch myTouch(6,5,4,3,2); extern unsigned int a0[0x76C]; extern unsigned int a1[0x76C]; extern unsigned int a2[0x76C]; extern unsigned int a3[0x76C]; extern unsigned int a4[0x76C]; extern unsigned int a5[0x76C]; extern unsigned int a6[0x76C]; extern unsigned int a7[0x76C]; extern unsigned int a8[0x76C]; extern unsigned int a9[0x76C]; int scale = 3; // for the pic size to make it large or small // for specifying the upper left x coordinates and y coordinates for buttons. // as the buttons will be displayed in the same row so the x values will be different and the y values will be the same. int imagex = 100; //for digit1 int imagey = 200; // for digit1 int imagex2 = 250; // for digit 2 int imagey2 = 200; // for digit2 int imagex3 = 400;// for digit 3 int imagey3 = 200;// for digit 3 // for button1 int button1x1 = 10; // 90 int button1y1 = 20; // 180 int button1x2 = 140; // 220 int button1y2 = 80; // 230 // for button2 int button2x1 = 160; // 160 int button2y1 = 20; // 20 int button2x2 = 290; // 290 int button2y2 = 80; // 80 // for button3 int button3x1 = 310; // 310 int button3y1 = 20; // 20 int button3x2 = 450; // 450 int button3y2 = 80; // 80 // for button4 int button4x1 = 470; // 160 int button4y1 = 20; // 20 int button4x2 = 610; // 290 int button4y2 = 80; // 80 int data1 = 0; // new code // on off codes for device1 long int password1 = 555;// to on long int password2 = 551;// to off //device2 long int password3 = 777; // TO TURN ON long int password31 = 222; // to turn off //device3 long int password4 = 221; // to turn on long int password41 = 444; // to turn off //device4 long int password5 = 441; // to turn on long int password51 = 888; // to turn off // new code end // Finally we set up UTFT_Buttons :) void drawButtons() { // Draw the upper row of buttons myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.print(" ON", 50, 40); // 115, 195 myGLCD.setBackColor (0, 0, 255); // button2 codding myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.print(" ON", 200, 40); // 115, 195 myGLCD.setBackColor (0, 0, 255); // button3 codding myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.print(" ON", 350, 40); // 115, 195 myGLCD.setBackColor (0, 0, 255); // button4 codding myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.print(" ON", 500, 40); // 115, 195 myGLCD.setBackColor (0, 0, 255); myGLCD.setColor(fg[1], fg[3], fg[6]); myGLCD.setBackColor (0, 0, 0); myGLCD.print("Device1", 10, 100); myGLCD.print("Device2", 160, 100); myGLCD.print("Device3", 310, 100); myGLCD.print("Device4", 470, 100); // for line myGLCD.drawRect(10, 120, 610, 124); myGLCD.setColor(fg[0], fg[1], fg[2]); // white myGLCD.fillRect(10, 120, 610, 124); // for large rectangle myGLCD.drawRect(10, 130, 610, 450); myGLCD.setColor(fg[255], fg[255], fg[255]); myGLCD.fillRect(10, 130, 610, 450); // for right side rectangle for Alerts display myGLCD.drawRect(615, 10, 800, 450); myGLCD.setColor(fg[50], fg[1], fg[2]); myGLCD.fillRect(615, 10, 800, 450); myGLCD.print("A L E R T S", 620, 20); // rooms making myGLCD.drawBitmap (imagex, imagey, 50, 38, a0, scale); // first digit myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a0, scale); // second digit myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a0, scale); // second digit } void setup() { Serial.begin(9600); Serial3.begin(9600); // bluetooth module connected here pinMode(relay1,OUTPUT); pinMode(relay2,OUTPUT); pinMode(relay3,OUTPUT); pinMode(relay4,OUTPUT); // keep all the relays off digitalWrite(relay1, LOW); digitalWrite(relay2, LOW); digitalWrite(relay3, LOW); digitalWrite(relay4, LOW); pinMode(sensor1, INPUT); // Initial setup myGLCD.InitLCD(); myGLCD.clrScr(); myTouch.InitTouch(); myTouch.setPrecision(PREC_MEDIUM); myGLCD.setFont(BigFont); myGLCD.setBackColor(0, 0, 255); drawButtons(); } void loop() { while (true) { if (myTouch.dataAvailable()) { myTouch.read(); x=myTouch.getX(); y=myTouch.getY(); // FOR BUTTON1 if ((x>=button1x1 && x<=button1x2 && y >=button1y1 && y<=button1y2)&&(button1on == 0) ) // Button: Enter { waitForIt(button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.print(" OFF", 50, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device1 ON"); Serial3.println("Device1 ON"); digitalWrite(relay1,HIGH); button1on = 1; x=0; y=0; delay(1000); } if ((x>=button1x1 && x<=button1x2 && y >=button1y1 && y<=button1y2)&&(button1on == 1) ) // Button: Enter { waitForIt(button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.print(" ON", 50, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device1 off"); Serial3.println("Device1 off"); digitalWrite(relay1,LOW); button1on = 0; x=0; y=0; delay(1000); } // for button2 if ((x>=button2x1 && x<=button2x2 && y >=button2y1 && y<=button2y2)&&(button2on == 0) ) // Button: Enter { waitForIt(button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.print(" OFF", 200, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device2 ON"); digitalWrite(relay2,HIGH); button2on = 1; x=0; y=0; delay(1000); } if ((x>=button2x1 && x<=button2x2 && y >=button2y1 && y<=button2y2)&&(button2on == 1) ) // Button: Enter { waitForIt(button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.print(" ON", 200, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device2 off"); digitalWrite(relay2,LOW); button2on = 0; x=0; y=0; delay(1000); } // for button3 if ((x>=button3x1 && x<=button3x2 && y >=button3y1 && y<=button3y2)&&(button3on == 0) ) // Button: Enter { waitForIt(button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.print(" OFF", 350, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device3 ON"); digitalWrite(relay3,HIGH); button3on = 1; x=0; y=0; delay(1000); } if ((x>=button3x1 && x<=button3x2 && y >=button3y1 && y<=button3y2)&&(button3on == 1) ) // Button: Enter { waitForIt(button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.print(" ON", 350, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device3 off"); digitalWrite(relay3,LOW); button3on = 0; x=0; y=0; delay(1000); } // for button4 if ((x>=button4x1 && x<=button4x2 && y >=button4y1 && y<=button4y2)&&(button4on == 0) ) // Button: Enter { waitForIt(button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.print(" OFF", 500, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device4 ON"); digitalWrite(relay4,HIGH); button4on = 1; x=0; y=0; delay(1000); } if ((x>=button4x1 && x<=button4x2 && y >=button4y1 && y<=button4y2)&&(button4on == 1) ) // Button: Enter { waitForIt(button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.print(" ON", 500, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device4 Off"); digitalWrite(relay4,LOW); button4on = 0; x=0; y=0; delay(1000); } } int sensor, data, d1,d2,d3; sensor = analogRead(sensor1); // any sensor // new code from here myGLCD.setBackColor(0,0,0); myGLCD.setColor(fg[0], fg[1], fg[2]); // for white color if( sensor > 600 && alert1 == 1 ) { myGLCD.print("Sensor1:", 620, 80); myGLCD.print("exceeded", 640, 100); alert1 = 0; } if( sensor < 600 && alert1 == 0 ) { myGLCD.print("Sensor1:", 620, 80); myGLCD.print("Normal ", 640, 100); alert1 = 1; } Serial.println(sensor); // send sensor value to bluetooth Serial3.println(sensor); // new code end here data = sensor / 10; d3 = sensor % 10; d2 = data % 10; d1 = data / 10; // for digit3 if ( d3 == 0) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a0, scale); if ( d3 == 1) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a1, scale); if ( d3 == 2) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a2, scale); if ( d3 == 3) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a3, scale); if ( d3 == 4) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a4, scale); if ( d3 == 5) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a5, scale); if ( d3 == 6) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a6, scale); if ( d3 == 7) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a7, scale); if ( d3 == 8) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a8, scale); if ( d3 == 9) myGLCD.drawBitmap (imagex3, imagey3, 50, 38, a9, scale); // for 2nd digit if ( d2 == 0) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a0, scale); // second digit if ( d2 == 1) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a1, scale); // second digit if ( d2 == 2) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a2, scale); // second digit if ( d2 == 3) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a3, scale); // second digit if ( d2 == 4) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a4, scale); // second digit if ( d2 == 5) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a5, scale); // second digit if ( d2 == 6) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a6, scale); // second digit if ( d2 == 7) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a7, scale); // second digit if ( d2 == 8) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a8, scale); // second digit if ( d2 == 9) myGLCD.drawBitmap (imagex2, imagey2, 50, 38, a9, scale); // second digit // for the first digit if ( d1 == 0) myGLCD.drawBitmap (imagex, imagey, 50, 38, a0, scale); if ( d1 == 1) myGLCD.drawBitmap (imagex, imagey, 50, 38, a1, scale); if ( d1 == 2) myGLCD.drawBitmap (imagex, imagey, 50, 38, a2, scale); if ( d1 == 3) myGLCD.drawBitmap (imagex, imagey, 50, 38, a3, scale); if ( d1 == 4) myGLCD.drawBitmap (imagex, imagey, 50, 38, a4, scale); if ( d1 == 5) myGLCD.drawBitmap (imagex, imagey, 50, 38, a5, scale); if ( d1 == 6) myGLCD.drawBitmap (imagex, imagey, 50, 38, a6, scale); if ( d1 == 7) myGLCD.drawBitmap (imagex, imagey, 50, 38, a7, scale); if ( d1 == 8) myGLCD.drawBitmap (imagex, imagey, 50, 38, a8, scale); if ( d1 == 9) myGLCD.drawBitmap (imagex, imagey, 50, 38, a9, scale); if(Serial3.available()>0) { bdata = Serial3.parseInt(); //delay(200); Serial.print(bdata); if (bdata == password1) { waitForIt(button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.print(" OFF", 50, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device1 ON"); Serial3.println("Device1 ON"); digitalWrite(relay1,HIGH); button1on = 1; x=0; y=0; delay(1000); } if( bdata == password2) { waitForIt(button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button1x1, button1y1, button1x2, button1y2); myGLCD.print(" ON", 50, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device1 off"); Serial3.println("Device1 off"); digitalWrite(relay1,LOW); button1on = 0; x=0; y=0; delay(1000); } if (bdata == password3 ) // Button: Enter { waitForIt(button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.print(" OFF", 200, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device2 ON"); Serial3.println("Device2 ON"); digitalWrite(relay2,HIGH); button2on = 1; x=0; y=0; delay(1000); } if (bdata == password31 ) // Button: Enter { waitForIt(button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button2x1, button2y1, button2x2, button2y2); myGLCD.print(" ON", 200, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device2 off"); Serial3.println("Device2 off"); digitalWrite(relay2,LOW); button2on = 0; x=0; y=0; delay(1000); } // for button3 if (bdata == password4 ) // Button: Enter { waitForIt(button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.print(" OFF", 350, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device3 ON"); Serial3.println("Device3 ON"); digitalWrite(relay3,HIGH); button3on = 1; x=0; y=0; delay(1000); } if (bdata == password41 ) // Button: Enter { waitForIt(button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button3x1, button3y1, button3x2, button3y2); myGLCD.print(" ON", 350, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device3 off"); Serial.println("Device3 Off"); digitalWrite(relay3,LOW); button3on = 0; x=0; y=0; delay(1000); } // for button4 if (bdata == password5 ) // Button: Enter { waitForIt(button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.print(" OFF", 500, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device4 ON"); Serial.println("Device4 ON"); digitalWrite(relay4,HIGH); button4on = 1; x=0; y=0; delay(1000); } if (bdata == password51 ) // Button: Enter { waitForIt(button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(bg[0], bg[1], bg[2]); myGLCD.fillRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (button4x1, button4y1, button4x2, button4y2); myGLCD.print(" ON", 500, 40); myGLCD.setBackColor (0, 0, 255); Serial.println("Device4 Off"); Serial.println("Device4 Off"); digitalWrite(relay4,LOW); button4on = 0; x=0; y=0; delay(1000); } } } } void waitForIt(int x1, int y1, int x2, int y2) { myGLCD.setColor(255, 0, 0); myGLCD.drawRoundRect (x1, y1, x2, y2); while (myTouch.dataAvailable()){ } delay(20); // list all files in the card with date and size myGLCD.setColor(fg[0], fg[1], fg[2]); myGLCD.drawRoundRect (x1, y1, x2, y2); } |
Android HMI development Program Explanation:
Once again I want to tell you if you didn’t watch my previous three tutorials, then stop over here, first watch those tutorials, and then you can resume from here. As you can see it’s a very long program, but trust me it’s really easy, and I am not going explain each and every instruction, because all of the functions used in this program, I have already explained it in my previous three tutorials. Now let me show you the changes which I made. One more thing; make sure you use the higher version of the Arduino IDE, I am using 1.6.5 version.
All the variables, buttons coordinates and functions are exactly the same I didn’t make any changes. The first change which I made was in the void setup function. I activated the Serial port 3, as my Bluetooth module is connected with serial port 3 and as you can see 9600 is the baud rate. So this is the only change that I made in the void setup function.
In every button function, I added serial3.println function to send the devices on and off information to the android cell phone application, as you can see for button1 I am sending device1 on , and device1 off and so On for the remaining buttons. The advantage of adding this instruction is that, when you press the button on the HMI touch screen it also send the information to the android cell phone application. This way you can know if someone turns on or turns off any load.
Then I made another change to send the sensor value to the android application. Now here comes the most important change.
if(Serial3.available()>0) if the mega has received data on serial port3 then simply read the serial port 3 and store the value in bdata. Bdata is a variable which is already defined above. Then we simply compare the value stored in bdata with the value which is stored in password1. If both are equal then we simply execute these instructions. These instructions are exactly the same which are used in the button functions, so I am using the same exact instructions. Because, I want to change the caption on the buttons. So when I press a button in my cell phone application, this way It can change the button caption on the HMI touch screen. So this way on the HMI screen you can control the writing on buttons from ON to OFF or from OFF to ON . I am doing the same exact thing for all the buttons.
Download Program and all the needed things:control hmi tft touch screen using android cell phone
hello, quick question, what is the “waitForIt” it keeps saying that it isnt declared in my scope