branchement tft lcd color monitor free sample

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.

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.

It is advisable to change graphics adapter driver to Standard VGA Graphics adapter, accessible from Display Properties, before beginning card installation. This is because the drivers currently used by the system may not be compatible with a flat panel. Selecting Standard VGA ensures basic compatibility during the install process; thereafter the specific flat panel monitor drivers can take over for optimum performance.

T55A/T85A - (15"/18" Flat Panel Analog Monitor). This monitor has a 15-way D-type connector and plugs into a standard D-shell analog receptacle. The monitor may be used with any graphics card or port supporting SVGA or better, video output.

T55A/T85A and Matrox graphics cards - some Matrox cards support both P&D 32-way Digital connector and 15 way D-shell connectors. The 15-way monitor plug must be inserted into the 15-way socket on the Matrox card. If the PC has a graphics adapter built into the motherboard, this will be disabled when the Matrox card is installed (It is advisable to change graphics adapter driver to Standard VGA Graphics adapter, accessible from Display Properties, before beginning card installation). Connectors can be used at once without damage to monitor or PC. However the T55A/T85A must always be plugged into the 15-way socket.

T55A/T85A and T55D/T85D monitors are available shipped with Matrox G200 graphics cards. If installing with one of these cards there are two methods of installation:

Choosing "Change Driver" and selecting "Have Disk" when in Windows will load the device drivers for the card and nothing else. The Matrox display driver utilities will not be loaded. The user will have to manually set the required screen size and Color depth from display properties window.

mgasetup.exe - pre-configured display installation. Monitor configured to run at 1024 x 768 and 16 bit Color at end of installation. These are the IBM recommended settings for optimum viewing area, resolution and Color content for the T55. These drivers are not compatible with T85 monitors. The setup.exe file on the same diskette as mgasetup.exe can be used for install of a T55 monitor but without using default screen settings.

The user is advised to use the most current graphics drivers available, when using a third party graphics card. The video settings for T55 - 15" panels should be 1024 x 768 display size, 16-bit Color (65,536 Color content) and 60Hz refresh rate. For T85 - 18" panels, use 1280 x 1024 display size, 16 bit Color (65,536 Color content) and 60Hz refresh rate. If Digital flat panel support via P&D connector is available to drive a T55D/T85D, the user should follow the manufacturers instructions for installation of the graphics card and drivers.

If Windows detects a plug and play monitor, the correct INF files may be loaded from the floppy disk included in the software disk set, shipped with the graphics card. To refresh the monitor settings manually, enter from Display Properties / Settings / Advanced Properties / Monitor / Change / Have Disk and insert the INF Files diskette into drive A.

For optimum performance IBM recommend the use of 16-bit Color (65,536 Colors) for lifelike image and fast graphical manipulation. Selecting higher Color counts is at the expense of graphical throughput.

The IBM default screen size is 1024 x 768 pixels for T55 monitors and 1280 x 1024 for T85 monitors. These displays are not able to show higher resolution than their default.

T55A/T85A monitors can be configured through the monitor front panel On Screen Display (OSD) to auto-expand the display to full size. This function may also be disabled.

T55D/T85D monitors achieve higher picture stability and clarity through one-to-one digital bit mapping. Expanding the desktop is achieved by selecting the required size from Display Properties and as such there is no analog expand function accessible through the monitor.

Select 60Hz refresh rate if available. All T55/T85 monitors operate a physical refresh rate of 60Hz. If the PC supply"s frames at a higher rate, these are shadowed by the T55A/T85A monitor, which then selects the most recent frame to display at a 60Hz frequency.

This tutorial shows how to use the I2C LCD (Liquid Crystal Display) with the ESP32 using Arduino IDE. We’ll show you how to wire the display, install the library and try sample code to write text on the LCD: static text, and scroll long messages. You can also use this guide with the ESP8266.

Additionally, it comes with a built-in potentiometer you can use to adjust the contrast between the background and the characters on the LCD. On a “regular” LCD you need to add a potentiometer to the circuit to adjust the contrast.

Before displaying text on the LCD, you need to find the LCD I2C address. With the LCD properly wired to the ESP32, upload the following I2C Scanner sketch.

After uploading the code, open the Serial Monitor at a baud rate of 115200. Press the ESP32 EN button. The I2C address should be displayed in the Serial Monitor.

Displaying static text on the LCD is very simple. All you have to do is select where you want the characters to be displayed on the screen, and then send the message to the display.

The next two lines set the number of columns and rows of your LCD display. If you’re using a display with another size, you should modify those variables.

Scrolling text on the LCD is specially useful when you want to display messages longer than 16 characters. The library comes with built-in functions that allows you to scroll text. However, many people experience problems with those functions because:

In a 16×2 LCD there are 32 blocks where you can display characters. Each block is made out of 5×8 tiny pixels. You can display custom characters by defining the state of each tiny pixel. For that, you can create a byte variable to hold  the state of each pixel.

In summary, in this tutorial we’ve shown you how to use an I2C LCD display with the ESP32/ESP8266 with Arduino IDE: how to display static text, scrolling text and custom characters. This tutorial also works with the Arduino board, you just need to change the pin assignment to use the Arduino I2C pins.