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This amount of pins is needed because your arduino is communicating via a parallel interface, with the display. You need pins to select the correct register to switch between readwrite mode and to transfer the data.. You can reduce this amount by using a I2C Backpack. I features a chip that handles all this required actions and takes care of the parallel interface of the lcd.. The arduino communicates via I2C with the backpack. I2C is a serial bus. That requires only two signal lines and was developed for communication between ICs. I2C is also known as TWI Two Wire Interface Using the module. We can reduce the amount of required IO pins from 7 to only 2. On top of that, we need less parts, because the module already features a potentiometer to adjust contrast. The module can also be used with bigger LCDs. This makes it great for fast prototyping without having to deal with a crazy amount of wiring to display some simple data.. You can find the I2C backpack on ebay.. Sometimes the backpack comes already assembled with a display. To use the module. You need a library that handles the communication between Arduino and I2C module There, a few libraries available you can find a link in the description. Lets. Look at the schematic GND to GND 5V, with VCC A4 to SDA A5, to SCL. Note that the SDA and SCL pins on your arduino board can differ. I put the most common pins in the video description If you are not sure which pins to use just google, your board name i2c pins, Lets, look a the Code.

First, you include the needed Libraries, Wire.h and LiquidCristalI2C.h Every device on the i2c bus needs. A unique adress, create a LiquidCrystalI2C object and pass the adress as a parameter. 16 and 2 stand for the amount of columns and rows of your display. If you dont know the adress of your module, try 0x27 for most modules. This should work if it doesnt work. Watch my quicktip video about how to find the correct adress of any i2c device from this point on the code is very similiar to what we are used to from the standard lcd library in setup we initialize the display with lcd.begin. Then we can print on the display with lcd.printtext. We can clear the display with lcd.clear and set the Cursor to any position with lcd.setCursorcoloumn row. Last but not least, we can turn the backlight on and off with lcd.backlight or lcd.noBacklight. This feature is useful if you want to save energy to, e.g. increas e batterytime that’s it for this video. Thank you very much for watching. If you liked the video please subscribe and give a thumbs, up.

 
 

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arduino nano i2c pins Video

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