arduino tft lcd calculator quotation

Arduino development boards always help us to build a project easily and make it look more attractive. Programming an LCD with touch functionality may sound like a complicated task, but it can be made very easy by using Arduino libraries and extension modules. In this project, we will use a 3.5" Arduino TFT LCD to build an Arduino touchscreen calculator that can perform all basic calculations such as addition, subtraction, division, and multiplication.

Before we dive into the project, it is important to understand how this 3.5" TFT LCD module works and the model number used. Let"s take a look at the pinout of this 3.5" TFT LCD module.

As you can see, the module has 28 pins and fits perfectly into any Arduino Uno / Arduino Mega development board. The table below gives a description of these pins.

As you can see, the module pins can be divided into four main categories, namely LCD command pins, LCD data pins, SD card pins and power pins, we don"t need to know the details of how these pins work because they will be implemented by the Arduino library.

You can also find an SD card slot on the bottom of the module shown above. This slot can be used to load an SD card with bmp image files, which can be displayed on our TFT LCD screen using the Arduino program.

Another important thing to keep in mind is your interface IC. there are many types of TFT modules on the market from Adafruit TFT LCD modules to cheap Chinese clones. A program that fits an Adafruit expansion board may not be the same for a Chinese expansion board. Therefore, it is very important to know which type of LCD LCD you are holding. This detail must be obtained from the supplier. If you have a cheap clone like mine, then it most likely uses driver IC ili9341. You can follow the official Arduino tutorial to try some basic example programs to get familiar with this LCD.

If you intend to use the touch screen function of a TFT LCD module, it must be calibrated to work properly. An LCD screen that is not calibrated is unlikely to work properly; for example, you may touch in one place and the TFT may think it is touching somewhere else. These calibration results are not the same for all boards, so you will have to do this work yourself.

The best way to calibrate is to use a calibration sample program (with a library) or use a serial monitor to detect your errors. But for this project, calibration should not be a big issue due to the large size of the buttons, and I will also explain how to calibrate your LCD in the programming section below.

The 3.5" TFT LCD is a great Arduino expansion board. You can push the LCD directly onto the top of the Arduino Uno and have it match the pins perfectly and slide them in. However, for safety reasons, the programming terminals of the Arduino UNO must use small insulating tape in case the terminals come into contact with your TFT LCD screen. the LCD assembled to the UNO development board looks like the following.

We use the SPFD5408 library to ensure that the arduino calculator code works properly. This is a modified Adafruit library that works seamlessly with our LCD TFT module. You can view the full program at the end of this article.

Now, open the Arduino IDE and select Sketch -> Include Librarey -> Add .ZIP library. a browser window will open to navigate to the ZIP file and click "OK". If successful, you should notice "Library added to your Libraries" in the bottom left corner of your Arduino.

Now you can use the following code in the Arduino IDE and upload it to Arduino UNO to get the touchscreen calculator working. Further down the page, I"ll explain the code in small segments.

As mentioned before, we need to calibrate the LCD to make it work properly, but don"t worry the values given here are almost universal. The variables TS_MINX, TS_MINY, TS_MAXX and TS_MAXY determine the calibration of the screen. If you feel that the calibration is not ideal, you can make a slight change.

As we know, TFT LCD screens can display many colors, all of which must be entered as hexadecimal values. To make it more readable, we assign these values to a variable as shown below.

Okay, now we can move on to the programming part. This program involves three parts. One is to create a user interface for the calculator using buttons and displays. Then, detect the buttons based on user touch and finally calculate the results and display them. Let"s go through them one by one.

Here you can get creative to design the user interface of the calculator. I simply made the basic layout of the calculator with 16 buttons and a display unit. You must build the design as if you were drawing something on an MS drawing board. The added libraries will allow you to draw lines, rectangles, circles, characters, strings and more in any of the preferred colors. You can learn about the available features from this article.

The final step is to calculate the results and display them on the TFT LCD screen. The arduino calculator can only perform two numeric operations. These two numbers are named as variables "Num1" and "Num2". The variable "Number" is given and taken from Num1 and Num2, and the result is obtained.

The process of working with this Arduino touch screen calculator is very simple. You need to upload the following code to the Arduino development board and then power it up. At this point, a calculator will be displayed on the LCD screen.

After uploading the code you"ll able to see the calculator running in your display as mine and now you can perform basic mathematics calculations on this. So have fun making your own calculator with Arduino UNO.

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.

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.

In order the code to work and compile you will have to include an addition “.c” file in the same directory with the Arduino sketch. This file is for the third game example and it’s a bitmap of the bird. For more details how this part of the code work  you can check my particular tutorial. Here you can download that file:

It is basicly the CPU of the calculator as amongst other things, it will get instructions from the ROMs and execute them to perform the required tasks.

Displays are one of the best ways to provide feedback to users of a particular device or project and often the bigger the display, the better. For today’s tutorial, we will look on how to use the relatively big, low cost, ILI9481 based, 3.5″ Color TFT display with Arduino.

This 3.5″ color TFT display as mentioned above, is based on the ILI9481 TFT display driver. The module offers a resolution of 480×320 pixels and comes with an SD card slot through which an SD card loaded with graphics and UI can be attached to the display. The module is also pre-soldered with pins for easy mount (like a shield) on either of the Arduino Mega and Uno, which is nice since there are not many big TFT displays that work with the Arduino Uno.

The module is compatible with either of the Arduino Uno or the Arduino Mega, so feel free to choose between them or test with both. As usual, these components can be bought via the links attached to them.

One of the good things about this module is the ease with which it can be connected to either of the Arduino Mega or Uno. For this tutorial, we will use the Arduino Uno, since the module comes as a shield with pins soldered to match the Uno’s pinout. All we need to do is snap it onto the top of the Arduino Uno as shown in the image below, thus no wiring required.

This ease of using the module mentioned above is, however, one of the few downsides of the display. If we do not use the attached SD card slot, we will be left with 6 digital and one analog pin as the module use the majority of the Arduino pins. When we use the SD card part of the display, we will be left with just 2 digital and one analog pin which at times limits the kind of project in which we can use this display. This is one of the reasons while the compatibility of this display with the Arduino Mega is such a good news, as the “Mega” offers more digital and analog pins to work with, so when you need extra pins, and size is not an issue, use the Mega.

To easily write code to use this display, we will use the GFX and TFT LCD libraries from “Adafruit” which can be downloaded here. With the library installed we can easily navigate through the examples that come with it and upload them to our setup to see the display in action. By studying these examples, one could easily learn how to use this display. However, I have compiled some of the most important functions for the display of text and graphics into an Arduino sketch for the sake of this tutorial. The complete sketch is attached in a zip file under the download section of this tutorial.

As usual, we will do a quick run through of the code and we start by including the libraries which we will use for the project, in this case, the Adafruit GFX and TFT LCD libraries.

With this done, the Void Setup() function is next. We start the function by issuing atft.reset() command to reset the LCD to default configurations. Next, we specify the type of the LCD we are using via the LCD.begin function and set the rotation of the TFT as desired. We proceed to fill the screen with different colors and display different kind of text using diverse color (via the tft.SetTextColor() function) and font size (via the tft.setTextSize() function).

While in theory an Arduino can run any LCD, we believe that some LCDs are particularly suited to being an Arduino LCD display. We"ve currated this list of LCD displays that will make any Arduino-based project shine.

First is the interface. All of these displays support SPI. Builders often ask themselves (or us) "which interface uses the fewest GPIO pins? AND is that interface fast enough to update the screen at an acceptable rate for my application?" When using the relatively small procesor of the Arduino, SPI is usually the best interface because it takes few wires (either 3 or 4) however it does limit the overall size (number of pixels) that can be quickly controlled. I2C is another choice of interface to leave GPIOs open. We tend to recommend SPI over I2C for Arduino displays because SPI is quicker and better at handling more complex data transfer, like pulling image data from an SD card.

Which brings us to the second factor in choosing an Arduino display: the number of pixels. We typically recommend a display with a resolution of 320x240 or less for use with Arduino. Take for example a 320x240 24-bit display. Such a display takes 230,400 bytes *(8 + 2) = 2,304,000 bits for a single frame. Divide that by 8,000,000 (Arduino SPI speed of 8MHZ) = 0.288 seconds per frame or 3.5 frames per second. 3.5 fps is fast enough for many applications, but is not particularly quick. Using fewer bits-per-pixel or a display with fewer pixels will result in higher frame rates. Use the calculator below to calculate the frame rate for a display using SPI with an Arduino.

Third, we want to recommend displays that are easy to connect to an Arduino. Each of these displays has a ZIF tail or easily solderable throughholes, so no fine pitch soldering is needed. These displays can either be brought up on the CFA10102 generic breakout board, or with a custom CFA breakout board.

Most character displays can be run via Parallel connection to an Arduino. You"ll want to make sure you can supply enough current to operate the backlight.

In this tutorial we are going to learn how to make Arduino Calculator with TFT Display. Our calculator’s precision is up to two decimal points and you can add, subtract, multiply or divide up to 4 digit per number. Obviously you can add more number of digits if you want.

You have to just add number by touching on screen, maximum digits per number allowable is 4 and then select operator and add again second number, press on equal. Finally, you got the result on screen, Congratulation you have made your own Arduino Calculator with TFT Display.

Using the power bank circuit that my li polymer battery comes with (power bank comes with) can [+]output more current, so can also power keyboard mice and hubs. [+]safe, with protection [+]only powers on when there is current draw (Teensy itself may not be able to keep it on, maybe can with the LCD backlight) or/and USB device is connected. Some people add resisters to add current draw, and that is bullshit. Another problem is how to control whether I want the converter to start or not, and have no complete control sucks.

The Numworks calculator I am referencing uses a STM32 f7 and it will work at 2.8v, but not my teensy working at 600mhz. And it doesn"t need 5v because it doesn"t have a usb host port. Power supplying a battery powered project the a pain in the ass.

It"s one thing comparing against a state-of-the-art phone, but how did the Apollo 11 computer compare against a classic calculator? Texas Instruments was one of the most famous manufacturers of calculators. In 1998, they released the TI-73, and, in 2004, they released the TI-84.

If we compare the two calculators against the Apollo guidance computer we can note that the TI-73 has slightly less ROM, but eight times more RAM. By the time the TI-84 was released, amount of RAM had increased to 32 times more than the Apollo computer and the ROM was now more than 14,500 times more.

It"s mind-blowing to think about how a simple calculator, designed to help students decades ago pass their exams, was more powerful than the computer that landed man on the moon.

The user interface (called Display Keyboard [DSKY]) had a calculator-type interface where commands had to be input using numerical codes. Today"s interface would be a lot easier to use–which could matter in a stressful situation. It would almost certainly not have a keyboard, but would use swipe commands on a touch screen. If that were not possible, due to having to wear gloves, the interface might be through gestures, eye movement, or some other intuitive interface.

Ah, Arduino, I remember when you were just crawling around and blinking LEDs. Now you"re ready to learn how to speak! In this lesson we"ll learn how to use the Serial Library to communicate from the Arduino board back to the computer over the USB port. Then we"ll learn how to manipulate numbers and data.

For this lesson we won"t be using the shield, so simply remove it (keeping the mood light LEDs on it you"d like). The shield doesn"t contain any programs or data, it is just our way of connecing up the LEDs and resistors. We"ll use the shield again but for now, we can examine the RX and TX LEDs on the main Arduino board which will help you with debugging

Information is passed back & forth between the computer and Arduino by, essentially, setting a pin high or low. Just like we used that technique to turn an LED on and off, we can also send data. One side sets the pin and the other reads it. It"s a little like Morse code, where you can use dits and dahs to send messages by telegram. In this case, instead of a long cable, its only a few feet.

(Now, people who are all geeked-out will probably get angry at this point because I"m simplifying things. Well guess what, its an Arduino tutorial, not a OSI Physical Network Architecture tutorial.)

We"ve actually used the Serial communications capability already quite a bit...that"s how we send sketches to the Arduino! When you Compile/Verify what you"re really doing is turning the sketch into binary data (ones and zeros). When you Upload it to the Arduino, the bits are shoved out one at a time through the USB cable to the Arduino where they are stored in the main chip.

Next time you upload a sketch, look carefully at the two LEDs near the USB connector, they"ll blink when data is being transmitted. One blinks when the Arduino is receiving data (RX) and one blinks when the Arduino is transmitting data (TX)

Enough chatting amongst ourselves, its time to get the Arduino talking. Our first sketch is going to be the hello world! program. When it starts up, it will say "hello world!"

Even if we have nothing in the setupor loop procedures, the Arduino requires them to be there. That way it knows you really mean to do nothing, as opposed to forgetting to include them!

If there"s no library name, it means that the procedure is in the "default" collection of procedures we use. For example, delay() is so common, the designers of the Arduino software didn"t bother putting it into a library.

If you have broadband connection, you may remember reading somewhere that it has, say 350 kbps download rate. This is how fast the connection can read and write bits on the wire. (Needless to say, your broadband connection can transfer data a lot faster than an Arduino!)

If the Arduino transfers data at 9600 bits per second and you"re sending 12 bytes of data, how long does it take to send over this information?Highlight the text below for the answer12 bytes of data equals 12 * 8 = 96 bits of data. If we can transfer 9600 bits per second, then 96 bits takes 1/100th of a second!

If the Arduino transfers data at 19200 bits per second (19200 baud) and you"re sending 12 bytes of data, how long does it take to send over this information?Highlight the text below for the answerThis is twice as fast as before, so it will take half the time, about 1/200th of a second.

In the very common case of having a Diecimila Arduino, the serial monitor will auto-reset the Arduino. The sketch will start up a couple of seconds later

Otherwise, the Arduino does not reset itself. Either way, once you"ve switched to the serial monitor, press the reset button. If you have an NG Arduino you"ll have to wait 7 seconds for the sketch to start.

Each time you reset the Arduino, it performs the setup procedure, and prints out Hello again. If you look closely at the Arduino, you will also see the little TX LED blink just as it prints out this message. That"s your indication that data was sent.

When you println you are sending data from the Arduino to the computer. The Send button (and the text input next to it) are used to send data to the Arduino. We aren"t going to be using it in this lesson so don"t be surprised that it doesn"t do anything when you click it!

What simple modification should we perform to make the Arduino print Hello World over and over again?Highlight the text below for the answer Simply move theSerial.println("Hello world!"); statement from the setup procedure to theloopprocedure.

In this case, the Arduino looks at what the input to println is, and finds its actually a calculation. It looks up what a is (5) and what b is (10) and then adds them together (+) and then uses that as the value to send to println

Let"s make our first simple calculator, to calculate a hypoteneuse. If you remember from grade school, if you have a right-triangle, the hypoteneuse h can be calculated from the lengths of the two legs, c1 and c2 (which we"ll call a & b)

It turns out that this is totally OK, it just means that we don"t know what his going to store yet, because we"re going to calculate it later. Since it"s not assigned to a value upon creation, the Arduino just creates the box, the stuff inside is whatever was in left over in memory.

You"ll create a Ohm"s law calculator. Ohm"s law says that Voltage = Current * Resistance. (This is a pretty useful law which forms the basis of electronics, and we"ll study it in depth more later.) Starting with two variables, i for current and rfor resistance, have it print out the amount of voltage that can be measured accross the resistor.

To figure out how big a number we can store in a 2 byte-sized box use a calculator and take 2 to the power of the number of bits (since each bit can store 2 values, 0 or 1). Then we subtract 1 because like in the car odometer, you can"t actually display the final value, 10000. So, in this case the largest number is 216 - 1 = 65535. Since the number we"re trying to store (102400) is larger than that, we see that "rollover."

If you look at this line, what"s happening here is that the Arduino looks up the value of the variable drive_gb to get 100. Then we multiply 100 by 1024 to get 102400 and put that in the drive_mb box. Except the way that the Arduino software does this is that it creates a temporary variable the same size as drive_gb to store that calculation result before it sticks it into drive_mb. So basically we are still getting an overflow, except now its happening as we do the calculation.

Well, on your desktop computer, with gigabytes of memory (RAM), this is a reasonable thing to do. However, the tiny tiny computer in the Arduino has a grand total of 1 Kilobyte of memory. And some of that is used for background stuff you don"t see. For small sketches sure you can make everything a long and be done with it, but if you have a bigger sketch, you"ll run out of memory really fast and then you"ll have major problems. So in this case, every byte counts!

Now its time for you to expand the drive size calculator. Starting with the DriveCalcsketch, modify it so that it will also calculate how many KB are stored in the hard drive. Test it out with a couple different drive sizes.

Good work, you got through one of the more boring lessons. In this lesson you learned how to print text and data to the Serial Monitor. This is essential for debugging future projects! You also learned about data types and storage and how to use the Arduino to calculate stuff.

The other day I finally found a code that worked on my standard 2.8" TFT LCD by Simkeim, but then I pressed the bottom left corner too hard and the screen went white. The code is a calculator code and it worked because the screen showed the numbers and the screen saver, but when I pressed the screen nothing happened. After the screen went white, I "opened" it and saw no damage to the screen. I have tried a bunch of example sketches and now the touch functions work, but nothing is displayed on the screen. The LCD does not have any wires, it just plugs in the board. When I upload a sketch, the backlight changes brightness a bit, and there is a slight line on the left side of the screen, when the code uses dark colors, I can press two parts of the screen and the screen goes dark (except for a small part of the left side).