lcd module hd44780 quotation

ERM1602FS-3 is 16 characters wide,2 rows character lcd module,SPLC780C controller (Industry-standard HD44780 compatible controller),6800 4/8-bit parallel interface,single led backlight with white color included can be dimmed easily with a resistor or PWM,fstn-lcd positive,black text on the white color,high contrast,wide operating temperature range,wide view angle,rohs compliant,built in character set supports English/Japanese text, see the SPLC780C datasheet for the full character set. It"s optional for pin header connection,5V or 3.3V power supply and I2C adapter board for arduino.

ERM1601FS-1 is big 16 characters wide,1 row character lcd module,SPLC780C controller (Industry-standard HD44780 compatible controller),6800 4/8-bit parallel interface,single led backlight with white color included can be dimmed easily with a resistor or PWM,fstn-lcd positive,black text on the white color,high contrast,wide operating temperature range,wide view angle,rohs compliant,built in character set supports English/Japanese text, see the SPLC780C datasheet for the full character set. It"s optional for pin header connection,5V or 3.3V power supply and I2C adapter board for arduino.

Blue 16x2 LCD module featuring 2 rows consisting each of 16 characters. The module is compatible with the Hitachi HD44780 controller, and is commonly used in Arduino and other microcontroller projects.

Blue 16x2 LCD module featuring 2 rows consisting each of 16 characters. The module is compatible with the Hitachi HD44780 controller, and is commonly used in Arduino and other microcontroller projects.

The Hitachi HD44780 LCD controller is an alphanumeric dot matrix liquid crystal display (LCD) controller developed by Hitachi in the 1980s. The character set of the controller includes ASCII characters, Japanese Kana characters, and some symbols in two 40 character lines. Using an extension driver, the device can display up to 80 characters.

The Hitachi HD44780 LCD controller is limited to monochrome text displays and is often used in copiers, fax machines, laser printers, industrial test equipment, and networking equipment, such as routers and storage devices.

Compatible LCD screens are manufactured in several standard configurations. Common sizes are one row of eight characters (8×1), and 16×2, 20×2 and 20×4 formats. Larger custom sizes are made with 32, 40 and 80 characters and with 1, 2, 4 or 8 lines. The most commonly manufactured larger configuration is 40×4 characters, which requires two individually addressable HD44780 controllers with expansion chips as a single HD44780 chip can only address up to 80 characters.

Character LCDs may have a backlight, which may be LED, fluorescent, or electroluminescent. The nominal operating voltage for LED backlights is 5V at full brightness, with dimming at lower voltages dependent on the details such as LED color. Non-LED backlights often require higher voltages.

Character LCDs use a 16-contact interface, commonly using pins or card edge connections on 0.1 inch (2.54 mm) centers. Those without backlights may have only 14 pins, omitting the two pins powering the light. This interface was designed to be easily hooked up to the Intel MCS-51 XRAM interface, using only two address pins, which allowed displaying text on LCD using simple MOVX commands, offering cost effective option for adding text display to devices.

R/W: In most applications, reading from the HD44780 is not necessary. In that case, this pin can be permanently connected to ground and no processor pins need to be allocated to control it.

Selecting 4-bit or 8-bit mode requires careful selection of commands. There are two primary considerations. First, with D3–D0 unconnected, these lines will always appear high (binary 1111) to the HD44780 since there are internal pull-up MOSFETs.

The original HD44780 character generator ROM contains 208 characters in a 5×8 dot matrix, and 32 characters in a 5×10 dot matrix. More recent compatible chips are available with higher resolution, matched to displays with more pixels.

OK, this is the sketch that I used to try out user-defined characters on a four-row, 20 character LCD. If you have a two-row LCD, you"ll have to change the calls to "drawbar" in the main loop. You"ll need a potentiometer with the track connected to 0V and 5V, and the wiper connected to analog in 0. Turn (or slide) the pot to see the bar extend across the LCD. The crucial command to the LCD is 0x40, which is used to position the "cursor" in the CGRAM, which is where the user-defined characters are stored. A call to "home" is required after defining the characters, to put the cursor back into the main display memory. All this is documented in the HD44780 data sheet.

Looking at Future, they do seem to have a few LCDs quoted on their site, however it is certainly not a comprehensive list. If you contact a sales rep (there or anywhere) and provide them your requirements, they may come back with additional parts that their manufacturers produce that better fit your need.

Unless your volumes are going to be in the millions, let me dispel any thoughts you have of "Why not just talk to (LCD mfc) directly?". Said manufacturers will not care about you, and the premium they will charge to deal with you (if they bother at all) will be higher than what a typical distributor would, because, frankly, they do not want your direct business. Use the middlemen. They will make specifying, finding, and sourcing LCD panels vastly easier and cheaper.

Bolymin OLED character displays with a high degree of compatibility with the original LCD modules are ideal not only for brand new projects, but they also serve as excellent upgrades for older projects. This is an archive article published 07/15/2020. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.

LCD or OLED? It is still a dilemma for many, but we have tried to shed more light on this in our recent article LCD or OLED - which one do you choose?

If you‘re already decided for a more modern and beautiful variant - OLED, then we have good news for you. In terms of mechanical design, we already have alternatives to many well-proven, character LCD modules.

These are displays of 16x2, 20x2 and 20x4characters. Specifically, we have direct, very close alternatives to the Bolymin character modules BC1602A/A3, BC1602B, BC1602D, BC1602H, BC2002A and BC2004A.

To facilitate the search for replacement from LCD to OLED, Bolymin used relatively close nomenclature. For example, the OLED alternative for the LCD series BC1602H is called BL1602HM.

The advantage is that all these character OLED displayshave the same controller - HD44780 (with 4/8 bit 6800 MCU interface, simple 5V power supply) and thus any migration between individual types will be trouble-free.

As most industrial OLED displays on the market today, the BL-series modules can also operate within an extremely wide operating temperature range of-40 to +80°C. However, high long-term operating temperatures shorten the life of all OLED displays.

When you issue article on your website, please give its source: https://www.soselectronic.com/articles/bolymin/replace-the-character-lcd-module-with-an-oled-alternative-2442

This tutorial includes everything you need to know about controlling a character LCD with Arduino. I have included a wiring diagram and many example codes. These displays are great for displaying sensor data or text and they are also fairly cheap.

As you will see, you need quite a lot of connections to control these displays. I therefore like to use them with an I2C interface module mounted on the back. With this I2C module, you only need two connections to control the LCD. Check out the tutorial below if you want to use an I2C module as well:

These LCDs are available in many different sizes (16×2 1602, 20×4 2004, 16×1 etc.), but they all use the same HD44780 parallel interface LCD controller chip from Hitachi. This means you can easily swap them. You will only need to change the size specifications in your Arduino code.

For more information, you can check out the datasheets below. The 16×2 and 20×4 datasheets include the dimensions of the LCD and in the HD44780 datasheet you can find more information about the Hitachi LCD driver.

Most LCDs have a built-in series resistor for the LED backlight. You should find it on the back of the LCD connected to pin 15 (Anode). If your display doesn’t include a resistor, you will need to add one between 5 V and pin 15. It should be safe to use a 220Ω resistor, but this value might make your display a bit dim. You can check the datasheet for the maximum current rating of the backlight and use this to select an appropriate resistor value.

After you have wired up the LCD, you will need to adjust the contrast of the display. This is done by turning the 10 kΩ potentiometer clockwise or counterclockwise.

Plug in the USB connector of the Arduino to power the LCD. You should see the backlight light up. Now rotate the potentiometer until one (16×2 LCD) or 2 rows (20×4 LCD) of rectangles appear.

In order to control the LCD and display characters, you will need to add a few extra connections. Check the wiring diagram below and the pinout table from the introduction of this article.

We will be using the LCD in 4-bit mode, this means you don’t need to connect anything to D0-D3. The R/W pin is connected to ground, this will pull the pin LOW and set the LCD to WRITE mode.

To control the LCD we will be using the LiquidCrystal library. This library should come pre-installed with the Arduino IDE. You can find it by going to Sketch > Include Library > LiquidCrystal.

The example code below shows you how to display a message on the LCD. Next, I will show you how the code works and how you can use the other functions of the LiquidCrystal library.

After including the library, the next step is to create a new instance of the LiquidCrystal class. The is done with the function LiquidCrystal(rs, enable, d4, d5, d6, d7). As parameters we use the Arduino pins to which we connected the display. Note that we have called the display ‘lcd’. You can give it a different name if you want like ‘menu_display’. You will need to change ‘lcd’ to the new name in the rest of the sketch.

In the loop() the cursor is set to the third column and first row of the LCD with lcd.setCursor(2,0). Note that counting starts at 0, and the first argument specifies the column. If you do not specify the cursor position, the text will be printed at the default home position (0,0) if the display is empty, or behind the last printed character.

Next, the string ‘Hello World!’ is printed with lcd.print("Hello World!"). Note that you need to place quotation marks (” “) around the text. When you want to print numbers or variables, no quotation marks are necessary.

Clears the LCD screen and positions the cursor in the upper-left corner (first row and first column) of the display. You can use this function to display different words in a loop.

This function turns off any text or cursors printed to the LCD. The text/data is not cleared from the LCD memory. This means it will be shown again when the function display() is called.

This function turns on automatic scrolling of the LCD. This causes each character output to the display to push previous characters over by one space. If the current text direction is left-to-right (the default), the display scrolls to the left; if the current direction is right-to-left, the display scrolls to the right. This has the effect of outputting each new character to the same location on the LCD.

The following example sketch enables automatic scrolling and prints the character 0 to 9 at the position (16,0) of the LCD. Change this to (20,0) for a 20×4 LCD.

With the function createChar() it is possible to create and display custom characters on the LCD. This is especially useful if you want to display a character that is not part of the standard ASCII character set.

Technical info: LCDs that are based on the Hitachi HD44780 LCD controller have two types of memories: CGROM and CGRAM (Character Generator ROM and RAM). CGROM generates all the 5 x 8 dot character patterns from the standard 8-bit character codes. CGRAM can generate user-defined character patterns.

/* Example sketch to create and display custom characters on character LCD with Arduino and LiquidCrystal library. For more info see www.www.makerguides.com */

After including the library and creating the LCD object, the custom character arrays are defined. Each array consists of 8 bytes, 1 byte for each row. In this example 8 custom characters are created.

In this article I have shown you how to use an alphanumeric LCD with Arduino. I hope you found it useful and informative. If you did, please share it with a friend that also likes electronics and making things!

I would love to know what projects you plan on building (or have already built) with these LCDs. If you have any questions, suggestions, or if you think that things are missing in this tutorial, please leave a comment down below.

3.3V supply. Some of these are hd44780 compatible, although I focus on the graphic ones, mostly. There are SPI and I2C versions available, but at least the SPI ones are not "pure" SPI but also some control pins have to be toggled in between => poor chip design. That makes it hard to save pins and to create library code, that can be integrated without much effort (e.g. ISR outputting data from a buffer to the display).

Hi again! In this tutorial we will not discover any new MCU modules. Instead we will learn how to use the 1602 character LCD with the HD44780 driver. If you read the PIC10F200 tutorials, you should already be familiar with it. But that time I talked about it superficially, and now I will tell you about it in more detail. If you read the previous tutorial, you still can find something interesting here as I will show another programming approach of communication between the LCD and the MCU.

The task for today is still the same as in tutorial 18. As is customary in programming, we need to write the text “Hello world ☻” on the LCD. The “smiley” character should be generated manually and loaded into the Character Generator memory.

There are several displays with the HD44780 driver, they can have different line numbers and position numbers (1x8, 2x8, 1x16, 2x16, 2x20, 4x20 etc.), also they can have different backlight colors (green, yellow, blue, etc.) or not have a backlight at all. The character’s color can be black or white. So, as you see, there is a diversity but all of them have the same interface and are controlled using the same commands. I have the display shown in Figure 1 which I bought a long time ago on Aliexpress.

This LCD has the built-in character generator, so you don’t need to design your own characters (like we had to with the 7-segment indicator). We can just send the ‘A’ letter to the display, and it will be shown - fascinating, isn’t it? Also, the display has 16 empty cells in which you can load your own characters and then use them (I will talk about it later). The character generator of the LCDs from Aliexpress usually have a Chinese code page, so you can use the first 128 ASCII characters, which includes capital and small English letters, numbers, and punctuation signs which is quite good!

RW is the read/write input. When it is low, the data goes from the microcontroller to the LCD, and when it is high, the data goes the reverse direction. As we don’t expect any data from the LCD, we can connect this pin directly to ground.

D0-D7 are the data inputs of the 8-bit parallel interface. The HD44780 driver also supports the 4-bit parallel interface. In this case, pins D0-D3 remain unused, and the bytes are transmitted by nibbles: higher one first, lower one second.

As for the commands that the HD44780 uses, we didn’t consider them previously but now we will consider them in detail. I will base my explanations on the data sheet of the HD44780 driver, so you also can refer to it for full information. Let me present to table 6 from the data sheet (Figure 3) where all the LCD commands are described.

As you can see in Figure 3, the LCD has quite few commands, and each of them has at least one “1” in the data bits. Let me briefly run over all commands.“Clear display” command (0x01) seems to be quite clear (pun definitely intended): it clears the display content and sets the DDRAM counter to 0, so after this, the next character will be printed in the first position of the first line.

F (bit #2) sets the character font type: 0 for 5x8, 1 for 5x10. This parameter should be set according to the physical LCD type. The most widespread displays have the 5x8 characters, so we need to set this bit as 0.

“Set DDRAM address” (0x80) sets the address of the display data memory. This address has 7 bits width, and sets the position of the cursor at the LCD. Bit #6 sets the line number (0 – first line, 1 – second line), and bits #3-0 set the position within a line (0 to 15).

This schematic diagram consists of the PIC18F14K50 MCU (DD1), PICKit debugger (X1), and the 1602 LCD (X2) which is connected as described above. The Vo pin is connected to the 10-47 kOhm potentiometer R1. When you power up the device, you should rotate the handle of the potentiometer to make the rectangles of the LCD barely visible. Then the contrast level is set correctly. The LED+ pin is connected to VCC through the 22-47 Ohm resistor R2. The RS, E, D4, D5, D6, and D7 pins are connected to the MCU. The data pins D4-D7 are connected to the pins RC0-RC3, respectively. The RS input is connected to RC4, and E input is connected to RC5. The RW input of the LCD is connected to GND, as we will just write to the LCD. The D0-D3 inputs remain unused in the 4-bit interface.

In this project we will only use the Pin Module and the System Module. The configuration is very simple and doesn’t require additional explanation (Figure 6-7).

In the System Module we set the CPU frequency as 32 MHz and disable the Low-voltage programming. In the Pin Module we configure pins to which the LCD is connected (see Figure 5) as outputs and give them the corresponding custom name.

In this project we also will use the concept of distributing the code between different files like we did in tutorial 15. So we will create special files where we will write all the LCD-related code.

We need to create two new files: one “main.c…” and one “xc8_header.h…”, and call them both “lcd_1602_mcc” (see tutorial 15 for more details on how to do this).

Thelcd_send function (line 3) allows sending the data byte to the LCD via a 4-bit interface. It has two parameters: value, which represents the byte that will be sent to the LCD, and rs which represents the state of the RS pin: 0 for low or 1 for high.

The lcd_data function (line 5) sends the character byte to the LCD, which is defined with thedata parameter. This character will be sent either to CGRAM or to DDRAM.

Thelcd_init function (line 6) initializes the LCD with the 4-bit interface. It has two parameters: cursor which shows (when it is 1) or hides (when it is 0) the cursor, and blink which enables (when it is 1) or disables (when it is 0) the blinking of the cursor position.

The lcd_create_char function (line 9) creates one character in the CGRAM memory at the address defined by the addr parameter. Parameter data is the array of 8 bytes that define the character.

First, we include the “mcc.h” header file (line 1) to use the MCC-generated functions in the current file. Then we include the “lcd_1602_mcc.h” file (line 2). Actually we don’t necessarily need to include it because we don’t use any definitions from that header in the current file. The rest of the file contains the functions code.

Let’s begin with the function lcd_send (lines 4-50). This is the most important function here and it implements the low-level communication between the MCU and LCD. To understand better how it works, let’s consider the part of the timing diagram from the figure 9 of the datasheet that corresponds to the writing cycle (Figure 8).

Now we need to send the upper nibble of the value via the pins D4-D7. We will do this bit by bit. This is a different approach than in the previous tutorial but it gives more flexibility because it doesn’t require all data pins of the LCD to be connected to the consequent pins of the same port of the MCU.

In line 27, we perform the short delay of 1us which is needed by the LCD driver. Actually the minimal length of the E pulse is 230 ns according to the data sheet, but as we’re not going to display dynamic information, 1 us is fine.

After that, we consider that the 8 bits of the data byte are sent to the LCD. Finally, we implement the 40us delay to complete the operation (line 49). According to the HD44780 driver data sheet the time of execution of most commands is 37us. So 40us is plenty of time for it to execute most of the commands. For the commands that need more execution time we will implement the additional delay beyond this function.

The lcd_command (lines 52-55) and lcd_data (lines 57-60) functions are very similar: they both consist of one line, in which the lcd_send function is invoked (lines 54 and 59). But in the lcd_command function the rs parameter is 0, and in the lcd_data function the rs parameter is 1. We could get rid of these functions and replace them with the lcd_send, which could do both functions, but using them makes the code more readable.

The lcd_init function (lines 62-73) initializes the LCD according to the routine suggested in Figure 24 of the datasheet of the HD44780 driver but with slight changes.

In lines 75-83 there is the lcd_write function. It displays the string ‘s’ in the LCD. The parameter s should be the c-type string with a terminating zero. This means that the string should end with the “0” character, which is the sign of the end of the line. This puts certain limitations, because we can’t display the character which is located at address 0 of the DDRAM but we can send it separately using the lcd_data function.

So, in line 77 we declare the variable iand assign its value as 0. This is the counter of the characters in the string. In line 78 we start the while loop which will be implemented while the current character is not 0. The content of the loop is quite simple. First, we send the current character to the LCD (line 80), and then we increment the character counter i (line 81).

In lines 85-92 there is the lcd_set_cursor function. In this function we consider that the first cursor position has the coordinates [1;1] but as the physical coordinates inside the display start with 0, we will need to subtract 1 from each parameter.

The last function, lcd_create_char, is located in lines 94-103. In this function we also first check if the address is bigger than 7 (line 96) and set it as 7 in this case (line 97). This is needed because there are only eight available custom characters with addresses 0 to 7.

In line 98, we send the “Set CGRAM address” command, in which we shift the addr parameter 3 bits to the left. This is needed because the last 3 bits set the line address within one character (see Figure 4). After that, we implement the for loop (line 99) inside which we send the 8 bytes to the LCD which will form the required character (line 101).

And that are all functions that are required for operation with the LCD in the current and following projects. Please save these two files, we will copy-paste them to other projects as well.

As you can see, the program is very short. This is because the majority of the code was written in previously described files. In line 2 we include the “lcd_1602_mcc.h” file to use the LCD-related functions.

In lines 6-19 there is the main function of the program. In lines 11-16 there are functions related to the LCD. In line 11, we initialize the LCD without the cursor or blinking. In line 12, we create a new character at address 1 using the array smile. In line 13, we set the cursor at the sixth position of the first line, and then write the text “Hello” in it (line 14). In line 15, we set the cursor at the fifth position of the second line, and then write the text “world ☻” there (line 16). Pay attention to the expression “\1” in the text. The backslash symbol makes the next character in the string the special one. For example “\n” means the new line, “\r” means carriage return, “\”” means the quote sign, etc. If the number follows the backslash, this means that we want to print the character with the address defined by this number. So the expression “\1” means the character at the address 1, which is the smiley that we defined in line 4.

So assemble the device according to the schematics diagram (Figure 5), compile the program, and connect your PICkit to the PC. Configure the PICkit voltage according to your LCD type (5V or 3.3V) and run the program. You should see the text “Hello world ☻” on your LCD. If you don’t see the text even now, rotate the potentiometer handle to set the contrast, this should help. If you still don’t see anything then check the connections: there are a lot of wires in this device and it’s easy to mess up.

Character LCD display module, COB type (Chip On Board) WH1602D-YYH-CTK#010 from Winstar Co. with 16 characters by 2 lines, yellowgreen background color and black characters. LCD matrix is a positive STN with transflective polarizer. The display allows the use of 4-bit and 8-bit interface. The module has HD44780 compatible controller.