oled lcd display arduino quotation

I have an I2C OLED connected to my Arduino Uno and I have used it to display integers in past projects, but I would like to know how to place quotes around a variable (in this case Serial.read() ). My current solution displays strange characters around the text on the OLED, but if I use a constant non-changing variable the OLED doesn"t spit out a garbage character. Here"s my code:

I have purchased an i2c oled 2.42" and using the u8glib library. I found this project from sspence at http://www.instructables.com/id/DIY-Amp-Hour-Meter-Arduino/ and tried to convert it to using this OLEd.

※Price Increase NotificationThe TFT glass cell makers such as Tianma,Hanstar,BOE,Innolux has reduced or stopped the production of small and medium-sized tft glass cell from August-2020 due to the low profit and focus on the size of LCD TV,Tablet PC and Smart Phone .It results the glass cell price in the market is extremely high,and the same situation happens in IC industry.We deeply regret that rapidly rising costs for glass cell and controller IC necessitate our raising the price of tft display.We have made every attempt to avoid the increase, we could accept no profit from the beginning,but the price is going up frequently ,we"re now losing a lot of money. We have no choice if we want to survive. There is no certain answer for when the price would go back to the normal.We guess it will take at least 6 months until these glass cell and semiconductor manufacturing companies recover the production schedule. (May-11-2021)

ER-OLED032-1W is the graphic OLED display module made of 256x64 individual white OLED pixels,diagonal is only 3.2 inch.The controller ic SSD1322, communicates via 6800/8080 8-bit parallel and 3-wire/4-wire serial interface. Because the display makes its own light, no backlight is required. This reduces the power required to run the OLED and is why the display has such high contrast,extremely wide viewing angle and extremely operating temperature.The fpc is the connector type,we offer optional zif connector(fpc connector).

It"s easily controlled by MCU such as 8051,PIC,AVR,ARDUINO,ARM and Raspberry Pi.It can be used in any embedded systems,industrial device,security,medical and hand-held device.

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, I’ll explain how to set up an LCD on an Arduino and show you all the different ways you can program it. I’ll show you how to print text, scroll text, make custom characters, blink text, and position text. They’re great for any project that outputs data, and they can make your project a lot more interesting and interactive.

The display I’m using is a 16×2 LCD display that I bought for about $5. You may be wondering why it’s called a 16×2 LCD. The part 16×2 means that the LCD has 2 lines, and can display 16 characters per line. Therefore, a 16×2 LCD screen can display up to 32 characters at once. It is possible to display more than 32 characters with scrolling though.

The code in this article is written for LCD’s that use the standard Hitachi HD44780 driver. If your LCD has 16 pins, then it probably has the Hitachi HD44780 driver. These displays can be wired in either 4 bit mode or 8 bit mode. Wiring the LCD in 4 bit mode is usually preferred since it uses four less wires than 8 bit mode. In practice, there isn’t a noticeable difference in performance between the two modes. In this tutorial, I’ll connect the LCD in 4 bit mode.

The 3-in-1 Smart Car and IOT Learning Kit from SunFounder has everything you need to learn how to master the Arduino. It includes all of the parts, wiring diagrams, code, and step-by-step instructions for 58 different robotics and internet of things projects that are super fun to build!

Here’s a diagram of the pins on the LCD I’m using. The connections from each pin to the Arduino will be the same, but your pins might be arranged differently on the LCD. Be sure to check the datasheet or look for labels on your particular LCD:

Also, you might need to solder a 16 pin header to your LCD before connecting it to a breadboard. Follow the diagram below to wire the LCD to your Arduino:

All of the code below uses the LiquidCrystal library that comes pre-installed with the Arduino IDE. A library is a set of functions that can be easily added to a program in an abbreviated format.

In order to use a library, it needs be included in the program. Line 1 in the code below does this with the command #include . When you include a library in a program, all of the code in the library gets uploaded to the Arduino along with the code for your program.

Now we’re ready to get into the programming! I’ll go over more interesting things you can do in a moment, but for now lets just run a simple test program. This program will print “hello, world!” to the screen. Enter this code into the Arduino IDE and upload it to the board:

There are 19 different functions in the LiquidCrystal library available for us to use. These functions do things like change the position of the text, move text across the screen, or make the display turn on or off. What follows is a short description of each function, and how to use it in a program.

TheLiquidCrystal() function sets the pins the Arduino uses to connect to the LCD. You can use any of the Arduino’s digital pins to control the LCD. Just put the Arduino pin numbers inside the parentheses in this order:

This function sets the dimensions of the LCD. It needs to be placed before any other LiquidCrystal function in the void setup() section of the program. The number of rows and columns are specified as lcd.begin(columns, rows). For a 16×2 LCD, you would use lcd.begin(16, 2), and for a 20×4 LCD you would use lcd.begin(20, 4).

This function clears any text or data already displayed on the LCD. If you use lcd.clear() with lcd.print() and the delay() function in the void loop() section, you can make a simple blinking text program:

Similar, but more useful than lcd.home() is lcd.setCursor(). This function places the cursor (and any printed text) at any position on the screen. It can be used in the void setup() or void loop() section of your program.

The cursor position is defined with lcd.setCursor(column, row). The column and row coordinates start from zero (0-15 and 0-1 respectively). For example, using lcd.setCursor(2, 1) in the void setup() section of the “hello, world!” program above prints “hello, world!” to the lower line and shifts it to the right two spaces:

You can use this function to write different types of data to the LCD, for example the reading from a temperature sensor, or the coordinates from a GPS module. You can also use it to print custom characters that you create yourself (more on this below). Use lcd.write() in the void setup() or void loop() section of your program.

The function lcd.noCursor() turns the cursor off. lcd.cursor() and lcd.noCursor() can be used together in the void loop() section to make a blinking cursor similar to what you see in many text input fields:

Cursors can be placed anywhere on the screen with the lcd.setCursor() function. This code places a blinking cursor directly below the exclamation point in “hello, world!”:

This function creates a block style cursor that blinks on and off at approximately 500 milliseconds per cycle. Use it in the void loop() section. The function lcd.noBlink() disables the blinking block cursor.

This function turns on any text or cursors that have been printed to the LCD screen. The function lcd.noDisplay() turns off any text or cursors printed to the LCD, without clearing it from the LCD’s memory.

This function takes anything printed to the LCD and moves it to the left. It should be used in the void loop() section with a delay command following it. The function will move the text 40 spaces to the left before it loops back to the first character. This code moves the “hello, world!” text to the left, at a rate of one second per character:

Like the lcd.scrollDisplay() functions, the text can be up to 40 characters in length before repeating. At first glance, this function seems less useful than the lcd.scrollDisplay() functions, but it can be very useful for creating animations with custom characters.

lcd.noAutoscroll() turns the lcd.autoscroll() function off. Use this function before or after lcd.autoscroll() in the void loop() section to create sequences of scrolling text or animations.

This function sets the direction that text is printed to the screen. The default mode is from left to right using the command lcd.leftToRight(), but you may find some cases where it’s useful to output text in the reverse direction:

This code prints the “hello, world!” text as “!dlrow ,olleh”. Unless you specify the placement of the cursor with lcd.setCursor(), the text will print from the (0, 1) position and only the first character of the string will be visible.

This command allows you to create your own custom characters. Each character of a 16×2 LCD has a 5 pixel width and an 8 pixel height. Up to 8 different custom characters can be defined in a single program. To design your own characters, you’ll need to make a binary matrix of your custom character from an LCD character generator or map it yourself. This code creates a degree symbol (°):

NHD-1.27-AU-SHIELD | Arduino Shield with OLED Display | 128x96 Pixels | 262K Full Color | Serial Interface | Built-in Logic Level Shifting for 3.3V & 5V Operation

Engineered in Elgin IL USA, we designed this Arduino shield with our 1.27" full color graphic OLED display. This shield comes with a serial interface OLED display module that has a single row pinout designed for easy breadboarding, supports video, and has all the great features of the graphic OLED. They are not limited to just Arduino boards, with their single row pinout, they can easily be used with any existing development board. The shield has built-in logic level shifting for 3.3V and 5V operation in order to support a broader range of end products. It has open source hardware and software to save engineers time and money. It also comes equipped with a microSD card slot allowing addional storage space for more complex code, eliminating any memory contraints of the Arduino board. For interchangeable development, all three sizes of our color OLED modules (1.27", 1.5" and 1.69") share the same pinout.

Easily modify any connectors on your display to meet your application’s requirements. Our engineers are able to perform soldering for pin headers, boxed headers, right angle headers, and any other connectors your display may require.

Choose from a wide selection of interface options or talk to our experts to select the best one for your project. We can incorporate HDMI, USB, SPI, VGA and more into your display to achieve your design goals.

Tired of using character LCD displays in your Arduino projects over and over? Well! They are, in fact, a thing of the past. Enter the fantastic OLED (Organic Light-Emitting Diode) displays! They’re extremely light, almost paper-thin, theoretically flexible, and produce a brighter, crisper image.

OLED displays are available in a range of sizes (such as 128×64, 128×32) and colors (such as white, blue, and dual-color OLEDs). Some OLED displays have an I2C interface, while others have an SPI interface.

One thing they all have in common, however, is that at their core is a powerful single-chip CMOS OLED driver controller – SSD1306, which handles all RAM buffering, requiring very little work from your Arduino.

In this tutorial, we’ll be using both I2C and SPI 0.96-inch 128×64 OLED displays. Don’t worry if your module is a different size or color; the information on this page is still useful.

An OLED display, unlike a character LCD display, does not require a backlight because it generates its own light. This explains the display’s high contrast, extremely wide viewing angle, and ability to display deep black levels. The absence of a backlight reduces power consumption significantly. The display uses about 20mA on average, though this varies depending on how much of the display is lit.

The SSD1306 controller operates at 1.65V to 3.3V, while the OLED panel requires a 7V to 15V supply voltage. All of these various power requirements are fulfilled by internal charge pump circuitry. This makes it possible to connect the display to an Arduino or any other 5V logic microcontroller without requiring a logic level converter.

Regardless of the size of the OLED display, the SSD1306 driver includes a 1KB Graphic Display Data RAM (GDDRAM) that stores the bit pattern to be displayed on the screen. This 1 KB memory area is divided into 8 pages (from 0 to 7). Each page has 128 columns/segments (block 0 to 127). And, each column can store 8 bits of data (from 0 to 7). That certainly proves that we have:

As previously stated, regardless of the size of the OLED module, each module contains 1KB of RAM. The 128×64 OLED module displays the entire contents of 1KB of RAM (all 8 pages), whereas the 128×32 OLED module displays only half of the RAM (the first 4 pages).

Connect the SCL pin to the I2C clock pin and the SDA pin to the I2C data pin on your Arduino. It is important to note that each Arduino board has different I2C pins. On Arduino boards with the R3 layout, the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. They are also known as A5 (SCL) and A4 (SDA).

Begin by connecting the VCC pin to the Arduino’s 5V output and the GND pin to ground. Now connect D0/CLK, D1/MOSI, RES, DC, and CS to digital pins 10, 9, 13, 11, and 12, respectively.

The SSD1306 controller in the OLED display has flexible but complex drivers. To use the SSD1306 controller, extensive knowledge of memory addressing is required. Fortunately, the Adafruit SSD1306 library was written to hide the complexities of the SSD1306 controller, allowing us to control the display with simple commands.

This is a hardware-specific library that handles lower-level functions. To display graphics primitives such as points, lines, circles, and rectangles, it must be paired with the Adafruit GFX Library. Install this library as well.

This sketch will provide you with a thorough understanding of how to operate the OLED display and can serve as the foundation for more practical experiments and projects. Try out the sketch, and then we’ll go over it in detail.

The sketch begins with the inclusion of four libraries: SPI.h, Wire.h, Adafruit_GFX.h, and Adafruit_SSD1306.h. Although the SPI.h library is not required for I2C OLED displays, we must include it to compile our program.

The next step is to create an object of Adafruit_SSD1306.h. The Adafruit_SSD1306 constructor accepts 3 arguments: screen width, screen height, and the Arduino pin number to which the display’s reset pin is connected. So, a couple of constants are defined.

Also, since the OLED display we are using doesn’t have a RESET pin, we will send -1 to the constructor to indicate that none of the Arduino pins are used to reset the display.

This sketch uses the I2C protocol for communicating with the display. However, the sketch is ready if you wish to use SPI. Simply uncomment the following lines of code.

In the setup function, we need to initialize the OLED object using the begin() function. This function accepts two parameters. The first parameter, SSD1306_SWITCHCAPVCC, turns on the internal charge pump circuitry, and the second parameter sets the OLED display’s I2C address. Most OLED display modules of this type have an I2C address of 0x3C, but some have 0x3D.

To display text on the screen, we must first set the font size. This can be accomplished by calling setTextSize() and passing a font size (starting from 1) as a parameter.

The final step is to use the display() command to instruct the library to bulk transfer the screen buffer to the SSD1306 controller’s internal memory and display the contents on the OLED screen.

To display inverted text, we use the setTextColor(FontColor,BackgroundColor) function once more. If you’ve been paying attention, you’ll notice that we previously passed only one parameter to this function, but now we’re passing two. This is possible due to function overloading.

The print() or println() functions can be used to display numbers on the OLED display. Because an overloaded implementation of these functions accepts 32-bit unsigned int values, you can only display numbers ranging from 0 to 4,294,967,295.

The print() and println() functions send data to the display as human-readable ASCII text, whereas the write() function sends binary data to the display. This function can thus be used to display ASCII symbols. For example, sending 3 displays a heart symbol.

You can scroll the display horizontally by calling the functions startscrollright() and startscrollleft(), and diagonally by calling the functions startscrolldiagright() and startscrolldiagleft(). All of these functions take two parameters: start page and stop page. Refer to the OLED Memory Map section for an explanation of the pages. Because the display has eight pages from 0 to 7, you can scroll the entire screen by scrolling all the pages, i.e. passing parameters 0x00 and 0x07.

Sometimes, we don’t want to scroll the whole display, but just a part of it. You can accomplish this by passing the appropriate start and stop page information to the scrolling functions.

Our last example shows how to display bitmap images on the OLED display. This comes in handy when displaying things like logos, sprites, infographics, or icons.

The drawBitmap() function is used to display a bitmap image on an OLED display. This function accepts six parameters: top left corner X coordinate, top left corner Y coordinate, monochrome bitmap byte array, bitmap width in pixels, bitmap height in pixels, and color.

But, before we can use the drawBitmap() function, we need an image to draw. Remember that the OLED display’s screen resolution is 128×64 pixels, so images larger than that will not display properly. To get a properly sized image, open your favorite drawing program, such as Inkscape, Photoshop, or MS Paint, and set the canvas size to 128×64 pixels.

Once you have a bitmap, you must convert it into an array that the SSD1306 OLED controller can understand. This can be accomplished in two ways: with image2cpp (online) or with LCD Assistant (offline).

The dimensions of your image will be displayed in the Canvas size option under Image Settings. If your image is larger than 128×64, change it to 128×64 by selecting the appropriate scaling option. You can see the result in the Preview section.

When you are satisfied with the results, you can proceed to generate the data array. Simply select Arduino Code as the code output format and press the Generate code button.

For your information, there is a setting called “Draw Mode”. It actually generates images based on the scanning pattern of the display. If your image appears distorted on your screen, try changing the mode.

There’s also a Windows application called LCD assistant that can turn your bitmap image into a data array. It is not as powerful as image2cpp, but it is still widely used by hobbyists.

For your information, there is a setting called Byte Orientation. It actually generates images based on the scanning pattern of the display. If your image appears distorted on your screen, try changing the mode.

One thing we all always wish we could do when using any display is to load our own custom graphics, be it a logo, gif etc. In today’s tutorial we will show how to do just that on an OLED display using an Arduino.

OLED (organic light-emitting diode)display is a display based on light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. This layer of organic semiconductor is situated between two electrodes; typically, at least one of these electrodes is transparent. OLEDs are used to create digital displays in devices such as television screens, computer monitors, portable systems such as mobile phones, handheld game consoles, and PDAs. OLED displays do not require a backlight because they emit visible light and can thus, display deep black levels and be thinner and lighter than a liquid crystal display (LCD).

The schematics for this project is a simple one as it involves just the connection between the OLED display and the Arduino. Connect them as shown in the Schematics below.

One thing that should be kept in mind while creating the graphics or logo is the canvass size. It’s important the canvass size is same as the screen, to ensure the designed graphics shows perfectly on the display. For our case, the canvass size is 128 x 64 as this is the resolution of our LCD.

It is also important to disable antialiasing when using the paint.net software and the graphics should be designed only in black and white as these are the only color schemes that work on the OLED display. Any other color used will not be visible on the display.

To load the graphics into our Arduino code, we will need to convert the bitmap image into byte arrays. To do this, we will use the LCD assistant software.  LCD Assistant is a free and easy to use software that converts bitmap images into a data array which can then be used in C programming language based firmware for any micro-controller. The software can be downloaded here.

The code for this tutorial is fairly simple, to facilitate the communication with the OLED display, we will be using U8 graphics library for Arduino which can be downloaded from this website here. Unzip the code into your Arduino libraries folder and launch an instance of the Arduino IDE. The code, using the void draw function will basically be displaying the graphics represented by each of the byte arrays we specify, one after the other, with a delay in between to ensure the graphics stay long enough on the screen to be seen.

In this code, we have three different byte arrays each of which represents different graphics. You can add your own byte array by copying the output of the LCD assistant software and pasting it into the code with a proper variable name following the format of the samples in the code.

The void draw function is the most important part of this project as it is in charge of drawing the graphics on the display. The function uses the u8g.drawBitmapP function from the U8 graphics library to draw the specified bitmap. The u8g.drawBitmapP function has five arguments; the first two are the x and y coordinates of the top left position on the screen where we want the graphics display to start from. The 3rd argument is the width of the bitmap image (128 in this case) divided by 8 while the 4th argument is the height of the bitmap image (64 in this case). The last argument is the variable name given to the byte array which represents the image to be displayed.

we leave the void setup function blank since it’s not necessary for this tutorial, but it must be included as its needed for the Arduino code to compile.

Next, we write the void loop() function. The void loop function for this project is fairly simple, all we need to do is call the void draw function to display a graphics and wait for few seconds before calling the function to display the next graphics.

OLED stands for Organic Light Emitting Diode or Organic electroluminescent diode, OLED displays have a series of thin films between two conductors. The film is made up of an organic compound that emits light in response to an electric current. Out of the two conductors usually one of them is transparent. This technology is majorly used to create digital displays in electronic devices like television screens, smartphones, portable gaming consoles etc.

The module is available in both SPI as well I2C communication protocol, however the display, which uses an I2C protocol is comparatively easier to use and we will be using the same here. The module is a 0.96 inch, 4 pin, monochromatic display with a regulator, meaning it can operate on 5V DC voltage, whereas the display without the regulator operates on a 3.3V DC voltage. The module consists of an SSD 1306 display controller with a resolution of 128x64 pixels. Usually the board uses an I2C address of 0x3C however, we can find the I2C with the help of a code which will be shared here. One of the major advantages of an OLED display over an LCD display is that the OLED display module does not require a backlight and has a high contrast which makes it easier to use. We can adjust the font size of the text, change the font and even change the color of the text non-monochromatic displays.

Follow the given instructions and use the circuit diagram given below to connect the module to the Arduino, after uploading the code the OLED display will be ready for use. The Arduino UNO has another I2C bus which has the pins located above the AREF pins which can also be used to interface with the module.

Before we begin writing the code we need to install 2 libraries which are available on the Arduino IDE, namely the Adafruit GFX library and the Adafruit SSD1306 library, after the installation of these libraries we can program the Arduino to interface with the OLED display. The first task that we need to accomplish is to find the I2C address of the module, for this purpose, we will connect the module to the Arduino and upload the following code to the board which will display the I2C address on the serial monitor. Make sure to use the correct baud rate (115200) while viewing the address on the serial monitor. The I2C address of this module is 0x3C which we found using the above code, now we will write another code to interface with the module. We can also use an example code to test the module by uploading the example from ssd1306 library (the I2C 128x64 version).

We will include the above four libraries in the code, in the setup section we will initialize the display and enter the I2C address and then clear the display. In the loop section we will use the display.setTextSize function to alter the text size as we see fit, the display.The SetTextColor function to change the font color, however, in a monochromatic display we can only set the text color to white which is what we have done here. We will use the display.setCursor function to set the starting position of the cursor on the display. display.display() is the most crucial function of the code as it enables us to see the text or the change in the text of the display. In the above code the display reads “Hello World Welcome to the OLED Tutorial” for 5 seconds, after which the screen goes blank for 2 seconds and the code runs on a loop.