20x4 serial lcd module free sample

The firmware change corrects the contrast setting to allow new CFA634-TMI modules to be used in existing systems without modifications. The change to the modules will be transparent to current users.

Starting August 1, 2015 the "Drive Bay Kit Configurator" located at https://www.crystalfontz.com/products/select_kit.html will no longer be functional for ordering one of our Serial or USB displays (CFA533, CFA631, CFA632, CFA633, CFA634, CFA635, and CFA735) in a bracket or SLED. This functionality is being moved to the Customize and Add to Cart process when checking out. This will allow for further customization by our customers to better fit their needs.

Pricing at the time of the PCN was issued was published as TBD. This update notices publishes pricing for the CFA634 family of modules effective 2013-07-01

As part of our continuous improvement process, the CFA634 family of modules has been redesigned to fall more in line with our other Value Add families of intelligent modules.

The firmware has been revised to support the hardware changes from the Samsung S6A0073 LCD controller to the Rockworks RW1067, and the Holtek HT48R30 one-time-programmable controller being replaced with the Cypress PSoC CY8C27443 for improved functionality.

As part of our continuous improvement process, the CFA634 family of modules has been redesigned to fall more in line with our other Value Add families of intelligent modules.

Samsung S6A0073 LCD controller is EOL. Module has been redesigned to incorporate the Rockworks RW1067. The Holtek HT48R30 one-time-programmable controller replaced with the Cypress PSoC CY8C27443 for improved functionality.

The previous CFA634-YMC-KS and CFA634-YMC-KU (new CFA634-YDI-KS and CFA634-YDI-KU) changed from STN to double negative (FFSTN) LCD for improved appearance.

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.

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.

Edit 2: I spoke with tech support, and they could neither give me any suggestions for work-arounds or re-works nor did they have a date for a replacement board. I"m experimenting with holding VPP low until the Arduino is booted and software serial is up and running.

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...

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.

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.

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.

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

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

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

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

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

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

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

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

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

ERM2004FS-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 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.

The LCD2S-204 is a RoHS compliant Serial LCD Daughter board that can be connected to a standard 20x4 Character Display Module that supports 4 bit mode. It enables the LCD display to be controlled via an I2C or SPI serial bus. The contrast and backlight are software controlled, and can be set to 254 levels.

The LCD2S-204 includes a 4x4 (16 button) matrix keypad encoder with software debouncing. A keypad with up to 16 buttons (4 rows by 4 columns) can be added to the display via a standard 10 pin, 2.54mm header. Our 12 button or 16 button keypads can be used, and can be connected to the LCD2S-204 via the CAB16RIB150 ribbon cable. When using the I2C serial bus, an interrupt line will be activated when a key is pressed, informing the user that there is key data to be read. Alternatively the LCD2S-204 can be polled to see if it has any pending keypad data.

The LCD2S-204 also has 5 user configurable, general purpose inputs/outputs. Two of them can deliver up to 1000mA each, and have protection circuitry for driving relays.

The LCD used must supports 4 bit mode. All 20x4 Character Modules sold on our site support 4 bit mode, and nearly all commercially available LCD Character Modules support it too. The LCD2S-204 has a high speed SPI/I2C serial bus. For convenience the I2C and SPI signals are available via a Micro Match type connector, and a standard 2.54mm, 2x6 row pin header. Most new Modtronix SBC boards have Micro Match connectors, and can be connected to the LCD2S-204 using these 150mm or 300mm cables. Or, the conn-micmat6-MW Micro Match connector can be used to create a custom cable.

The LCD2S has 2 general purpose open collector outputs, OUT1 and OUT2. These outputs can supply up to 1000mA, and have protection circuitry for driving relays. Both OUT1 and OUT2 are enabled by default. They are available via the X3 connector (2x6 pin header).

A matrix keypad supporting up to 16 buttons (4x4 matrix) can be connected to the LCD2S-204. The keypad is connected to the pins marked R1 to R4 (rows) and C1 to C4 (columns) on the X1 1x10 pin header. The LCD2S has built in button debouncing, which can be configured for different values. The default should work fine though.

The picture on the right shows and example of connecting a 12 button keypad, relay and buzzer to the LCD2S. The buzzer can be configured to sound each time a button is pressed, or controlled via the OUT command.

What is included1 x Serial LCD daughter board. The 16 pin connector that fits onto the LCD display is also assembled. To use this board with a 20x4 Character Display Module it just has to be soldered to the back of it.