arduino lcd display backlight price

Hi I"m new to Arduino and got a basic set. I setup the LCD I2C and installed both libraries (hd44780 and LiquidCrystal I2C). After running the I2C scan I got the following:

The 16x2 is the most commonly used LCD display module. It can display 16 characters in a column for 2 rows thus a total of 32 characters. The characters can either be number, alphabets or symbol. It is also possible to create your own custom character and display it if required. The LCD has the HD44780U display driver IC which is responsible for displaying characters on the LCD

This 16x2 LCD display has a blue background and back light which makes it unique and more visible than the commonly used green color. If you need the green backlight you can use this Green Backlight LCD. The required supply voltage is from 4.7V to 5.3V and the LCD can operate either in 8-bit mode or in 4-bit mode allowing you to save more GPIO pins on the controller side. The current consumption is about 1mA without the back light.

The 16x2 LCD pinout diagram is shown below. As you can see the module has (from right) two power pins Vss and Vcc to power the LCD. Typically Vss should be connected to ground and Vcc to 5V, but the LCD can also operate from voltage between 4.7V to 5.3V. Next, we have the control pins namely Contrast (VEE), Register Select (RS), Read/Write (R/W) and Enable (E). The Contrast pin is used to set the contrast (visibility) of the characters, normally it is connected to a 10k potentiometer so that the contrast can be adjusted. The Read/Write pin will be grounded in most cases because we will only be writing characters to the LCD and not read anything from it. The Register Select (RS) and Enable pin (E) pin are the control pins of the LCD and will be connected to the digital pins GPIO pins of the microcontroller. These pins are used to instruct the LCD where place a character when to clear it etc.

From DB0 to DB7 we have our eight Data Pins which are used to send information about the characters that have to be displayed on the LCD. The LCD can operate in two different modes, in the 4-bit Modeonly pins DB4 to DB7 will be used and the pins DB0 to DB3 will be left idle. In 8-bit Mode, all the eight-pin DB0 to DB7 will be used. Most commonly the 4-bit mode is preferred since it uses only 4 Data pins and thus reduces complexity and GPIO pin requirement on the microcontroller.Finally, we have the LED+ and LED- pins which are used to power the backlight LED inside our Display module. Normally the LED+ pin is connected to 5V power through a 100 ohm current limiting resistor and the LED- pin is connected to Ground.

With a potentiometer used to adjust backlight (Color: Blue) and contrast.Power supply: 5v and I2C address is: 0x27 Module dimension: 80mm x 35mm x 11mm

Have you been fed up with Black/White LCD screen? Do you want to try a colorful one? DFRobot I2C 16x2 Arduino LCD with RGB Backlight Display module will bring you a new experience about screen. It comes with RGB full color backlight, which has 16 million kinds of color.

Usually, Arduino LCD display projects will run out of pin resources easily, especially with Arduino Uno. And it is also very complicated with the wire soldering and connection. This I2C 16x2 LCD Screen is using an I2C communication interface. It means it only needs 4 pins for the LCD display: VCC, GND, SDA, SCL. It will saves at least 4 digital / analog pins on Arduino. And Gravity interface make it easier to use with our Gravity: IO expansion shield.

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I"ve worked a lot with 2x16 RGB LCD displays. There are a bunch of ways to use them in the Arduino space:Use the LiquidCrystal library. This takes more than half the pins of an ATMega and most of the pins of an ATTiny84. You can, however, share the four data pins with other devices that have chip select logic so that only one device masters or reads from those pins at once (that is, make it into a real data bus). I usually share 3 of the 4 with the ISP/SPI pins. As long as the LCD"s E pin is not asserted during programming (which would be unlikely), it works fine.

Use an i2c "backpack" and LiquidTWI2. The quintessential example of this is available from the OpenEVSE store, but that"s not the only version. Essentially you wire an MCP23017 up to the LCD the same way as the AdaFruit shield and bring the i2c and power out to a 4 pin SIP connector, all on an 80x36 mm board that fits exactly onto the back of the LCD module.

One thing to beware of is that there are four different variations on the 2x16 char RGB LCD - positive or negative (aka transmissive or transflective) text; and common cathode or common anode backlighting. There"s no wiring difference between transmissive or transflective, but for common cathode or common anode, you need to connect pin 15 either to +5 or ground and invert the sense of the RGB backlight control lines. LiquidTWI2 includes an initialization constant that lets you "hint" it that the backlight is inverted, but for most backpack/shields you would need to rework the board to change the connection on pin 15.

This LCD screen displays 2 rows of 20 columns and is intended as a character display. It is easily wired up and wiring examples for an Arduino Uno R3 and an Arduino Nano are shown below as well.

There is a really easy to use example in the Arduino IDE available under Examples -> LiquidCrystal -> HelloWorld Which will simply display Hello World on the top row and count in seconds on the bottom row.