20x4 lcd display specifications free sample

The Displaytech 204G series is a lineup of 20x4 character LCD modules. These modules have a 98x60 mm outer dimension with 77x25.2 mm viewing area on the display. The 204G 20x4 LCD displays are available in STN or FSTN LCD modes with or without an LED backlight. The backlight color options include yellow green, white, blue, pure green, or amber color. Get a free quote direct from Displaytech for a 20x4 character LCD display from the 204G series.

ERM2004SYG-3 is small size 20 characters wide,4 rows character lcd module,SPLC780C controller (Industry-standard HD44780 compatible controller),6800 4/8-bit parallel interface,single led backlight with yellow green color included can be dimmed easily with a resistor or PWM,stn-lcd positive,dark blue text on the yellow green color,wide operating temperature range,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.

This is really serious for me. The display was being used in a system that a user was travelling with. It has been working fine for weeks, but it seems that there is still a chance for these things to pick up garbage and freak out, even if it is not on the hardware serial lines.

Edit: I am going to call tech support in a few minutes but, for me, the issue is not whether I can recover this particular board. What I must do is put in place some kind of robust fix/hack to prevent this from happening again in the field. I can deal with SMT soldering, so if there"s a tested PCB fix in the works, I can likely implement it with a rework until it becomes available. Also, I don"t think it"s correct to suggest that Software Serial somehow was the cause of the LCD getting bricked.

Sadly, I am going to consider them a loss of time and money and am planning to replace them with another display module. If anyone has suggestions for a fix, I"m still all ears, but I can"t spend more time on this...

STN Blue background with White Edge-lit backlight, bottom (or 6:00) viewing angle, Transmissive (negative), RoHS Compliant. Available in both 3V or 5V power supply options.This display has a wide temperature range: -20° Celcius to +70° Celcius which equates to (-4° Fahrenheit to +158° Fahrenheit).

STN (super twisted nematic) provides a sharper image and wider viewing angle than TN (Twisted Nematic). The cost for STN if approximately 5% higher than TN. STN is an ideal fluid for outdoor products that need to be read at various angles. The Transmissive polarizer is best used for displays that run with the backlight on all the time. This polarizer provides the brightest backlight possible. When you have a need for a bright backlight with lower power drain, transmissive is a good choice.

Focus LCDs can provide many accessories to go with your display. If you would like to source a connector, cable, test jig or other accessory preassembled to your LCD (or just included in the package), our team will make sure you get the items you need.Get in touch with a team member today to accessorize your display!

Focus Display Solutions (aka: Focus LCDs) offers the original purchaser who has purchased a product from the FocusLCDs.com a limited warranty that the product (including accessories in the product"s package) will be free from defects in material or workmanship.

Newhaven 20x4 character Liquid Crystal Display shows characters with white pixels on a blue background when powered on. This transmissive LCD Display requires a backlight for visibility while offering a wide operating temperature range from -20 to 70 degrees Celsius. This NHD-0420DZ-NSW-BBW display has an optimal view of 6:00. This display operates at 5V supply voltage and is RoHS compliant.

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.

This is a 20x4 Arduino compatible LCD display module with high speed I2C interface. It is able to display 20x4 characters on two lines, whitecharacterson blue background.

Generally, LCD display will run out of Arduino pin resource. It needs 6 digital pins and 2 power pin for a LCD display. If you want to build a robot project, it will be a problem with Arduino UNO and LCD display.

This I2C 20x4 LCD display module is designed for Arduino microcontroller. It is using I2C communication interface, With this I2C interface, only 2 lines (I2C) are required to display the information on any Arduino based projects. It will save at least 4 digital / analog pins on Arduino. All connector are standard XH2.54 (Breadboard type). You can connect it with jumper wire directly.

This 1602 LCD module has 8 I2C address in all, from 0x20 to 0x27. You can set one according to your requirements, avoiding the confliction of I2C address. And its contrast can be adjusted manually.

Newhaven 20x4 character Liquid Crystal Display shows characters with dark pixels on a bright yellow/green background when powered on. This transflective LCD Display is visible with ambient light or a backlight while offering a wide operating temperature range from -20 to 70 degrees Celsius. This NHD-0420AZ-FL-YBW-33V3 display has an optimal view of 6:00. This display operates at 3.3V supply voltage and is RoHS compliant.

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.

The Arduino family of devices is features rich and offers many capabilities. The ability to interface to external devices readily is very enticing, although the Arduino has a limited number of input/output options. Adding an external display would typically require several of the limited I/O pins. Using an I2C interface, only two connections for an LCD character display are possible with stunning professional results. We offer both a 4 x 20 LCD.

The character LCD is ideal for displaying text and numbers and special characters. LCDs incorporate a small add-on circuit (backpack) mounted on the back of the LCD module. The module features a controller chip handling I2C communications and an adjustable potentiometer for changing the intensity of the LED backlight. An I2C LCD advantage is that wiring is straightforward, requiring only two data pins to control the LCD.

A standard LCD requires over ten connections, which can be a problem if your Arduino does not have many GPIO pins available. If you happen to have an LCD without an I2C interface incorporated into the design, these can be easily

The LCD displays each character through a matrix grid of 5×8 pixels. These pixels can display standard text, numbers, or special characters and can also be programmed to display custom characters easily.

Connecting the Arduino UNO to the I2C interface of the LCD requires only four connections. The connections include two for power and two for data. The chart below shows the connections needed.

The I2C LCD interface is compatible across much of the Arduino family. The pin functions remain the same, but the labeling of those pins might be different.

Located on the back of the LCD screen is the I2C interface board, and on the interface is an adjustable potentiometer. This adjustment is made with a small screwdriver. You will adjust the potentiometer until a series of rectangles appear – this will allow you to see your programming results.

The Arduino module and editor do not know how to communicate with the I2C interface on the LCD. The parameter to enable the Arduino to send commands to the LCD are in separately downloaded LiquidCrystal_I2C library.

Several examples and code are included in the Library installation, which can provide some reference and programming examples. You can use these example sketches as a basis for developing your own code for the LCD display module.

The I2c address can be changed by shorting the address solder pads on the I2C module. You will need to know the actual address of the LCD before you can start using it.

Once you have the LCD connected and have determined the I2C address, you can proceed to write code to display on the screen. The code segment below is a complete sketch ready for downloading to your Arduino.

The code assumes the I2C address of the LCD screen is at 0x27 and can be adjusted on the LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,16,2); as required.

Similar to the cursor() function, this will create a block-style cursor. Displayed at the position of the next character to be printed and displays as a blinking rectangle.

This function turns off any characters displayed to the LCD. The text will not be cleared from the LCD memory; rather, it is turned off. The LCD will show the screen again when display() is executed.

Scrolling text if you want to print more than 16 or 20 characters in one line then the scrolling text function is convenient. First, the substring with the maximum of characters per line is printed, moving the start column from right to left on the LCD screen. Then the first character is dropped, and the next character is displayed to the substring. This process repeats until the full string has been displayed on the screen.

The LCD driver backpack has an exciting additional feature allowing you to create custom characters (glyph) for use on the screen. Your custom characters work with both the 16×2 and 20×4 LCD units.

A custom character allows you to display any pattern of dots on a 5×8 matrix which makes up each character. You have full control of the design to be displayed.

To aid in creating your custom characters, there are a number of useful tools available on Internet. Here is a LCD Custom Character Generator which we have used.

The serial 20x4 LCD module from Nex-Robotics can be controlled by I2C or standard serial port with TTL 5V level signals. This dramatically reduces the number of pins consumed by LCD while interfacing with a microcontroller. It uses only two lines (TX and RX) for communication with any device. A well defined and easy to use protocol ensures smooth and error free operation.

Out of boredom I figured out I"ll write a library from scratch to interface the character LCD display which I got from ebay, quite cheap. Less than 7 pounds. However, I have written before a simple code to interface an LCD from scratch for 8051. So I have some experience and understanding how the character LCD works. The difference now will be, I" ll be using 4 bits, instead of 8 bits to communicate and read the busy flag. Essentially improving the previous code. I chose to write it for Arduino this time, because I have Sanguinololu bought for my 3D printer, and at some point I want to write a LCD user interface for it, from scratch. There won"t be anything spectacular about this tutorial, there are already good articles about this stuff for all kinds of devices. Moreover, arduino has bunch of LCD libraries available for download for free. BUT... in this tutorial I"ll describe problems I encountered and try to be as descriptive I can be so you can understand how the character LCD works, making you able to interface it with any micro-controller available, and even driving it by hand.

If you are a careful reader you would notice, that the LCD in the circuit diagram is 16x2 instead 20x4 like in title. That"s because in eagle by default I couldn"t find one with 20x4. However, most of the displays will use HD44780 as LCD controller, so if you understand how to use a 16x2 or 20x4 display or any character display with this chipset, you should be able to cope with any sized character LCDs. Even the pins are the same for these displays.

After we have wired the LCD I"ll do my best to explain more or less how the LCD works. The addresses, initializations etc. I"ll be referring to this datasheet a lot, so keep it open when reading this article. Off-topic: One thing I want to teach beginners is to read datasheets, in my opinion very valuable skill to have. Even though the HD44780 datasheet is not the best ones I"ve read, I"ll try to fill in the gaps.

As the names already suggest instruction register will be accessed for configuring and writing instructions to the LCD. DR register on the other hand will be used for writing the data you want for the display to show (not exactly accurate). You can see DR register as a buffer between two RAMs. It"s a temporary register which will eventually write itself automatically in of the available RAMs - CGRAM or DDRAM, depending on what you have written in IR.

DDRAM is used to temporary store the characters the display will show. So by changing the DDRAM, you will write text on your display. DDRAM stores the characters, how they will be drawn, depending on the code (page 10). You have the ability to put like 8 custom characters in CGRAM, but I won"t be elaborating on that. Actually, that would be a good homework. Try to read the datasheet and improve my code to support custom characters. It"s not that hard believe me.

Basically a busy flag is an indicator that the data from DR register is being written to one of the RAMs. You don"t want to change your data until it has finished writing it to the LCD. Otherwise the data will be corrupt and you end up showing Japanese characters (maybe). Basically the pin D7 is the busy flag, while it logic HIGH it means the data is being written to the LCD, when it"s 0 obviouslly it"s not busy anymore.

Address counter is basically a register, which specifies which block of RAM you want to either read or write to the LCD. It applies to both of the RAMs - DDRAM and CGRAM. While configuring the device, we will be able to set AC to be incremented or decremented automatically, so for most cases you won"t need to worry about it. Until we get to assigning coordinates where the text should be written.

But there is one important thing which I want to elaborate on, I even got confused on this matter. Basically the datasheet will tell you that there it has two modes 1-line display and 2-line display. From our perspective I have 4 line display, so how come there isn"t 4-line display available for DDRAM?

So far we have covered the main structure of the HD44780 LCD driver. You should now have an intuition of how the data is passed around and how it is stored. For CGRAM, you"ll have figure that on your own. Believe me it"s not that hard.

First thing we want to do is to initialize the display. Please see the Figure 24 on page 46 in datasheet. It has a nice diagram for the initialization.

It" s basically instruction to enable/disable the display, to show/hide the cursor and to make the cursor blink. Please refer to page 28 in datasheet.

As you can see it has 3 bits called D, C and B. Those are for configuring the things I mentioned before. But for initializition, we just turn off the display.

Final step you have to take to initialize the display. Basically in entry mode you configure whether the address counter (AC) will increment or decrement automatically and whether the display will shift instead of the cursor.

At this point we kind of have initialized the display, however we have to turn on the display. So after this, we have to call another Display on/off controlinstruction, this time we want to switch it on. And if you want for debugging or any other reason, you can enable now the cursor and the blinking of the cursor as well.

Remember, I was writing that you have to wait until the data is written in the RAM, either you substitute the lcdBusy() function for something like delay(1) or let"s write a function for checking the busy flag. See page 24 in datasheet, what command we have to send to read the busy flag, and which bit we will have to read.

So from the datasheet, we can see that we have to set RS to 0 and R/W to 1, and the BF is located on pin DB7. Taking all that into account, we can now write a function to wait until LCD has finished writing data to RAM. Another thing, because we are using 4 bits, we have to trigger the enable pin to read the upper 4 bits and then lower 4 bits. since we are only interested in BF for now, we can make a dummy trigger.

Basically those are all the necessary functions to communicate with the LCD. Now just to simplify our life, we can write a function to send string of characters automatically. I like to send a pointer to the string of characters and then just increment it until we reach the end. Just see my code you"ll understand.

And that"s it! You have implemented all the basic functions to use a 20x4 HD44780 based character LCD display. I wrote a simple class like library for the arduino.

This 20-character, 4-line parallel liquid crystal display achieves a large viewing area in a compact package. It features a yellow-green LED backlight and uses the common HD44780 interface, so sample interface code is widely available for a variety of microcontrollers. This is the same LCD that is included as part of some of our Orangutan X2 robot controller packages.

As shown in the diagram above, a potentiometer whose output is connected to Vo will allow you to set the contrast for optimal viewing of your display.

The backlight in this LCD is composed of LEDs in series. The total voltage drop across these LEDs is typically 4.2 V and the recommended current through the LEDs is 180 mA. You should use a current limiting resistor RLIMIT as shown above where:

Note: no cables or connectors are included with this product, but a 2×8 shrouded box header and 20", 16-conductor ribbon cable can be purchased separately. The box header can be soldered into the through-holes on the left or right side of the LCD PCB and the cable is designed to plug into the header.