iic i2c twi serial 2004 20x4 lcd module shield manufacturer

With IIC/I2C interface, it only takes two I/O port thus saving more for other usages. You can adjust the contrast by the potentiometer at its back. If you dont want the backlight, you can also unplug the jumper cap at the LCD back.

This IIC/I2C/TWI Serial 2004/20x4 LCD Module Shield for Arduino Uno/Mega2560 displays white contents on an elegant blue. It can display 4 rows with 20 characters for each. With IIC/I2C interface, it only takes two I/O ports thus saving more for other usages.

2012 latest IIC LCD2004-character LCD display module, a new high-quality 4 line 20 character LCD module not only set the contrast control knob selector switch also has a backlight and IIC communication interface. For Arduino beginners, not for the cumbersome and complex LCD driver circuit connection and a headache, the real significance of this LCD module will simplify the circuit, this module directly into the Arduino Sensor Shield V5.0 sensor expansion board IIC device interface can, GM 4P sensor connection cable, programmed through the Arduino controller, you can easily identify the slogan, sensor data records.

Features：IIC/I2C interface was developed to reduce the IO port usage on Arduino board.* Old 1602 screen requires 7 IO ports but this module uses only two.* Much needed control panel IO ports can be used to add some sensors, SD card and so on.* A New High-Quality 4 Line 20 Character Lcd Module.* Potentiometer can be adjusted to control the contrast.* Back light can be turned off by removing the jumper on the back panel.Specification:* Interface: I2C* I2C Address: 0x27* Pin Definition : GND、VCC、SDA、SCL* Back lit (Yellow with Black char color)* Supply voltage: 5V* Size : 60mm×99mm* Contrast Adjust : Potentiometer* Backlight Adjust : Jumper

This is a high-quality I2C LCD2004 display. It"s in elegant blue with white contents displayed. It can display 4 rows with 20 characters for each. With IIC/I2C interface, it only takes two I/O port thus saving more for other usages. You can adjust the contrast by the potentiometer at its back. If you don’t want the backlight, you can also unplug the jumper cap at the LCD back. With this shield, you can display whatever you want by programming the Arduino board. Therefore, this is a perfect choice to make your project more interesting and vivid!

If you’ve ever tried to connect an LCD display to an Arduino, you might have noticed that it consumes a lot of pins on the Arduino. Even in 4-bit mode, the Arduino still requires a total of seven connections – which is half of the Arduino’s available digital I/O pins.

The solution is to use an I2C LCD display. It consumes only two I/O pins that are not even part of the set of digital I/O pins and can be shared with other I2C devices as well.

True to their name, these LCDs are ideal for displaying only text/characters. A 16×2 character LCD, for example, has an LED backlight and can display 32 ASCII characters in two rows of 16 characters each.

At the heart of the adapter is an 8-bit I/O expander chip – PCF8574. This chip converts the I2C data from an Arduino into the parallel data required for an LCD display.

If you are using multiple devices on the same I2C bus, you may need to set a different I2C address for the LCD adapter so that it does not conflict with another I2C device.

An important point here is that several companies manufacture the same PCF8574 chip, Texas Instruments and NXP Semiconductors, to name a few. And the I2C address of your LCD depends on the chip manufacturer.

According to the Texas Instruments’ datasheet, the three address selection bits (A0, A1 and A2) are placed at the end of the 7-bit I2C address register.

According to the NXP Semiconductors’ datasheet, the three address selection bits (A0, A1 and A2) are also placed at the end of the 7-bit I2C address register. But the other bits in the address register are different.

So your LCD probably has a default I2C address 0x27Hex or 0x3FHex. However it is recommended that you find out the actual I2C address of the LCD before using it.

Connecting an I2C LCD is much easier than connecting a standard LCD. You only need to connect 4 pins instead of 12. Start by connecting the VCC pin to the 5V output on the Arduino and GND to ground.

Now we are left with the pins which are used for I2C communication. Note that each Arduino board has different I2C pins that must be connected accordingly. 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).

After wiring up the LCD you’ll need to adjust the contrast of the display. On the I2C module you will find a potentiometer that you can rotate with a small screwdriver.

Plug in the Arduino’s USB connector to power the LCD. You will see the backlight lit up. Now as you turn the knob on the potentiometer, you will start to see the first row of rectangles. If that happens, Congratulations! Your LCD is working fine.

To drive an I2C LCD you must first install a library called LiquidCrystal_I2C. This library is an enhanced version of the LiquidCrystal library that comes with your Arduino IDE.

Filter your search by typing ‘liquidcrystal‘. There should be some entries. Look for the LiquidCrystal I2C library by Frank de Brabander. Click on that entry, and then select Install.

The I2C address of your LCD depends on the manufacturer, as mentioned earlier. If your LCD has a Texas Instruments’ PCF8574 chip, its default I2C address is 0x27Hex. If your LCD has NXP Semiconductors’ PCF8574 chip, its default I2C address is 0x3FHex.

So your LCD probably has I2C address 0x27Hex or 0x3FHex. However it is recommended that you find out the actual I2C address of the LCD before using it. Luckily there’s an easy way to do this, thanks to the Nick Gammon.

But, before you proceed to upload the sketch, you need to make a small change to make it work for you. You must pass the I2C address of your LCD and the dimensions of the display to the constructor of the LiquidCrystal_I2C class. If you are using a 16×2 character LCD, pass the 16 and 2; If you’re using a 20×4 LCD, pass 20 and 4. You got the point!

First of all an object of LiquidCrystal_I2C class is created. This object takes three parameters LiquidCrystal_I2C(address, columns, rows). This is where you need to enter the address you found earlier, and the dimensions of the display.

In ‘setup’ we call three functions. The first function is init(). It initializes the LCD object. The second function is clear(). This clears the LCD screen and moves the cursor to the top left corner. And third, the backlight() function turns on the LCD backlight.

After that we set the cursor position to the third column of the first row by calling the function lcd.setCursor(2, 0). The cursor position specifies the location where you want the new text to be displayed on the LCD. The upper left corner is assumed to be col=0, row=0.

There are some useful functions you can use with LiquidCrystal_I2C objects. Some of them are listed below:lcd.home() function is used to position the cursor in the upper-left of the LCD without clearing the display.

lcd.scrollDisplayRight() function scrolls the contents of the display one space to the right. If you want the text to scroll continuously, you have to use this function inside a for loop.

lcd.scrollDisplayLeft() function scrolls the contents of the display one space to the left. Similar to above function, use this inside a for loop for continuous scrolling.

If you find the characters on the display dull and boring, you can create your own custom characters (glyphs) and symbols for your LCD. They are extremely useful when you want to display a character that is not part of the standard ASCII character set.

CGROM is used to store all permanent fonts that are displayed using their ASCII codes. For example, if we send 0x41 to the LCD, the letter ‘A’ will be printed on the display.

CGRAM is another memory used to store user defined characters. This RAM is limited to 64 bytes. For a 5×8 pixel based LCD, only 8 user-defined characters can be stored in CGRAM. And for 5×10 pixel based LCD only 4 user-defined characters can be stored.

After the library is included and the LCD object is created, custom character arrays are defined. The array consists of 8 bytes, each byte representing a row of a 5×8 LED matrix. In this sketch, eight custom characters have been created.

I"m using this with a Digistump DigiX, and it works very nicely. I like the white display on blue backlight.Some notes which I hope may be useful to others:- If it doesn"t seem to work at first, some suggestions: a- check the I2C address, that"s probably the main culprit (see below) b- if your Arduino has more than 1 I2C bus, check you are using the right one. c- check the voltage level on the IIC, the 2 pins on the left above the LCD are ground followed by Vcc, should be 5V.- There seems to be a lot of confusion on the I2C address. Mine was on the expected 0x27 address.There are 2 versions of the i2c chip which differ in their address and I suspect that"s why some people indicate they need to use address 0x3F instead of 0x27. Explanation follows.Look on the back at the marking on the i2c chip, it"s going to be either a PCF8574T or a PCF8574AT.The address is fixed by the 3 pins #1, #2 and #3 of the PCF8574, which you can verify are all connected to Vcc.Next check page 9 of the datasheet from http://www.nxp.com/documents/data_sheet/PCF8574.pdf :- For the "T" version, the address is going to be [0 1 0 0 A2 A1 A0], which is 0x27.- For the "AT" version, the address is going to be [0 1 1 1 A2 A1 A0], which is 0x3F.- The DigiX, like the Arduino DUE or a Raspberry Pi, uses 3.3V I/O. You MUST NOT connect this directly on the I2C bus when powering the LCD via 5V. Instead just grab any i2c level shifter, for example something like

or any similar board.- The I2C chip PCF8574T should work fine with a 3.3V level, and the HD44780 is supposed too. However when I tried, this was not enough to power the whole display. I had to provide 5V to Vcc and use a level shifter for the I2C SDA and SCL.- The DigiX from Digistump did not require any extra LiquidCrystal_I2C library: it"s already included in the DigiX libraries. However the DigiX has 2 I2C buses, and the library by default uses Wire1, which is pins 70 and 71. To try it out, use Examples > DigiX > DigiXLCD > BasicUsage in the Arduino IDE if configured with the DigiX libraries.- The library has an LCD::backlight() and noBacklight() functions which work well. The display is NOT readable with the backlight turned off.- Note that by default the display line "wraps" around (from line 1 to 3 then to 2 then to 4). Internally the HD44780 has 80 bytes of display. The default LCD::print() method thus wraps at the end of the line to the next logical line unless you clip/trim your strings.- On the back of the I2C board there"s a red led when powered and a jumper to deactivate it. There"s also a little knob to adjust the contrast -- it only changes the white dots contrasts and does not adjust the level of the blue backlight.

Introduction This is a high-quality I2C LCD 2004 display. It"s in elegant blue with white contents displayed. It can display 4 rows with 20 characters for each. With IIC/I2C interface, it only takes two I/O port thus saving more for other usages. You can adjust the contrast by the potentiometer at its back. If you don"t want the backlight, you can also unplug the jumper cap at the LCD back. With this shield, you can display whatever you want by programming for Arduino board. Therefore, this is a perfect choice to make your project more interesting and vivid! For more information,refer to https://www.sunfounder.com/wiki/index.php?title=I2C_LCD2004 Package Included 1 x I2C/IIC LCD2004 Module