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In this Arduino touch screen tutorial we will learn how to use TFT LCD Touch Screen with Arduino. You can watch the following video or read the written tutorial below.

For this tutorial I composed three examples. The first example is distance measurement using ultrasonic sensor. The output from the sensor, or the distance is printed on the screen and using the touch screen we can select the units, either centimeters or inches.

The next example is controlling an RGB LED using these three RGB sliders. For example if we start to slide the blue slider, the LED will light up in blue and increase the light as we would go to the maximum value. So the sliders can move from 0 to 255 and with their combination we can set any color to the RGB LED,  but just keep in mind that the LED cannot represent the colors that much accurate.

As an example I am using a 3.2” TFT Touch Screen in a combination with a TFT LCD Arduino Mega Shield. We need a shield because the TFT Touch screen works at 3.3V and the Arduino Mega outputs are 5 V. For the first example I have the HC-SR04 ultrasonic sensor, then for the second example an RGB LED with three resistors and a push button for the game example. Also I had to make a custom made pin header like this, by soldering pin headers and bend on of them so I could insert them in between the Arduino Board and the TFT Shield.

Here’s the circuit schematic. We will use the GND pin, the digital pins from 8 to 13, as well as the pin number 14. As the 5V pins are already used by the TFT Screen I will use the pin number 13 as VCC, by setting it right away high in the setup section of code.

I will use the UTFT and URTouch libraries made by Henning Karlsen. Here I would like to say thanks to him for the incredible work he has done. The libraries enable really easy use of the TFT Screens, and they work with many different TFT screens sizes, shields and controllers. You can download these libraries from his website, RinkyDinkElectronics.com and also find a lot of demo examples and detailed documentation of how to use them.

After we include the libraries we need to create UTFT and URTouch objects. The parameters of these objects depends on the model of the TFT Screen and Shield and these details can be also found in the documentation of the libraries.

So now I will explain how we can make the home screen of the program. With the setBackColor() function we need to set the background color of the text, black one in our case. Then we need to set the color to white, set the big font and using the print() function, we will print the string “Arduino TFT Tutorial” at the center of the screen and 10 pixels  down the Y – Axis of the screen. Next we will set the color to red and draw the red line below the text. After that we need to set the color back to white, and print the two other strings, “by HowToMechatronics.com” using the small font and “Select Example” using the big font.

Next is the distance sensor button. First we need to set the color and then using the fillRoundRect() function we will draw the rounded rectangle. Then we will set the color back to white and using the drawRoundRect() function we will draw another rounded rectangle on top of the previous one, but this one will be without a fill so the overall appearance of the button looks like it has a frame. On top of the button we will print the text using the big font and the same background color as the fill of the button. The same procedure goes for the two other buttons.

Here’s that function which uses the ultrasonic sensor to calculate the distance and print the values with SevenSegNum font in green color, either in centimeters or inches. If you need more details how the ultrasonic sensor works you can check my particular tutorialfor that. Back in the loop section we can see what happens when we press the select unit buttons as well as the back button.

Ok next is the RGB LED Control example. If we press the second button, the drawLedControl() custom function will be called only once for drawing the graphic of that example and the setLedColor() custom function will be repeatedly called. In this function we use the touch screen to set the values of the 3 sliders from 0 to 255. With the if statements we confine the area of each slider and get the X value of the slider. So the values of the X coordinate of each slider are from 38 to 310 pixels and we need to map these values into values from 0 to 255 which will be used as a PWM signal for lighting up the LED. If you need more details how the RGB LED works you can check my particular tutorialfor that. The rest of the code in this custom function is for drawing the sliders. Back in the loop section we only have the back button which also turns off the LED when pressed.

If you want an all-in-one solution, this TFT display comes with a mounting bracket to make installation even easier. The LCD is a high resolution 800X480 IPS display with IPS technology, which delivers superior image quality, accurate color, and high contrast ratio at any angle. The built-in steel bracket provides grounding for the TFT"s frame to protect against vibrations and EMI, guarenteeing a clear stable image. The threaded standoffs on the bracket are compatible with any M3 screws and there are four rack height mounting holes. This Liquid Crystal Display is RoHS compliant and does not include a touch panel.

The Arduino TFT screen is a backlit TFT LCD screen with a micro SD card slot in the back. You can draw text, images, and shapes to the screen with the TFT library.

The Arduino TFT library extends the Adafruit GFX, and Adafruit ST7735 libraries that it is based on. The GFX library is responsible for the drawing routines, while the ST7735 library is specific to the screen on the Arduino screen. The Arduino specific additions were designed to work as similarly to the Processing API as possible.

The TFT library relies on the SPI library, which must be included in any sketch that uses the scree. If you wish to use the SD card, you need to include the SD library as well.

The screen has the ability to show 16-bit color. The red and blue have 5-bits of resolution each (32 levels of red and blue), the green has 6-bits of resolution (64 different levels). For consistency with other applications, the library deals with color in 8-bit values for the red, green, and blue channels (0-255), and scales the colors appropriately.

inloop(), to draw a line across the screen, call line(). line() takes four arguments, the the starting x and y coordinates, and the ending x and y coordinates. For drawing a box, use rect(). rect() take four arguments as well : the x and y coordinates of the top left corner, followed by the width in pixels, and the height in pixels. Between each of these calls, change the color with stroke() or fill(). stroke() will change the color of a line, or the outline around a shape. fill() changes the internal color of a shape. Calling noStroke() will stop the library from drawing an outline around any shapes that follow it. If you call stroke() after noStroke(), the screen will again draw lines.

If you are using an Esplora, the structure of the program is the exact same. As the Esplora has a socket designed for the screen, and the pins for using the screen are fixed, an Esplora only object is created when targeting sketches for that board. You can reference the screen attached to an Esplora throughEsploraTFT.

To give the illusion of motion, you need to quickly erase and draw images on the screen. When using Processing on a powerful computer, you can callbackground() every time through your draw() function to erase the window contests and dra objects in their new positions. The Arduino is not as fast, is it takes a little time to clear the screen when calling background() with the TFT library.

To create the illusion of motion, it"s usually best to check if an object has moved each time throughloop(). If it has, then you should draw over the object with your background color, then redraw the object in its new location. Because you"re not updating all the pixels on the screen, it helps maintain the illusion of motion.

In @@loop()@ you"ll first update the position of the dot by adding the direction to the x and y position variables. After that, check to see if there is a difference between the current and the previous locations of the point. If there is a difference, erase the previous location by filling in the dot the same color as the background, then drawing a new dot in the updated location. If the point happens to run into the boundaries of the screen, have it reverse direction.

The TFT library includes a basic font for drawing text on screen. By default, characters are 5 pixels wide and 8 pixels tall. It is possible to change the font size to 10x16, 15x24, or 20x32. For additional information on the underlying font capabilities, see the Adafruit page on graphic primitives.

The TFT library has the ability to read .bmp files off a SD card and display them on the screen. Images can be smaller or larger than the screen resolution (160x128), but there is no method on the Arduino for image manipulation. The images should be sized before you put them on the SD card.

Connecting the pins in the proper way, you can see the lcd screen working with your Uno (or Duemilanove) just uploading the simple "TFTBitmapLogo" sketch.

The Arduino Leonardo & Arduino Yún use different pins to be compatible with the lcd screen. To set the pins MISO, MOSI and SCK, you have to use the ICSP terminals.+5V:+5V

The screen will show this message: "Arduino TFT Bitmap Example. Open serial monitor to run the sketch". Open the serial monitor to view the Arduino Logo.

To connect the lcd screen to an Arduino Due, use this pin configuration and don"t forget to set the right value for the variable "sd_cs" (#definesd_cs7) in the sketch:+5V:+3.3V

Now that you have tested the basic functionality of the screen, see the TFT library pages for information about the library"s API and additional examples. It"s also recommended to visit the Adafruit graphics library page for additional information on functions not covered.