We will be using the LCD in 4-bit mode, this means you don’t need to connect anything to D0-D3. Check the wiring diagram below and the pinout table from the introduction of this article. In order to control the LCD and display characters, you will need to add a few extra connections. You can tweak the contrast later if needed. Rotate the potentiometer until you see a row of rectangles appear. Now rotate the potentiometer until one (16×2 LCD) or 2 rows (20×4 LCD) of rectangles appear. Plug in the USB connector of the Arduino to power the LCD. This is done by turning the 10 kΩ potentiometer clockwise or counterclockwise. You can check the datasheet for the maximum current rating of the backlight and use this to select an appropriate resistor value.Īfter you have wired up the LCD, you will need to adjust the contrast of the display. If your display doesn’t include a resistor, you will need to add one between 5 V and pin 15. It should be safe to use a 220Ω resistor, but this value might make your display a bit dim. You should find it on the back of the LCD connected to pin 15 (Anode). Most LCDs have a built-in series resistor for the LED backlight. In order to test the display, you will need to make the connections as shown in the figure below. The pinout of a standard HD44780 LCD is given in the table below: Pin no. The pins at the top of the display are numbered 1-16 from left to right.
You will only need to change the size specifications in your Arduino code. These LCDs are available in many different sizes (16×2 1602, 20×4 2004, 16×1 etc.), but they all use the same HD44780 parallel interface LCD controller chip from Hitachi. As an Amazon Associate we earn from qualifying purchases. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on.
#Arduino libraries for keypad interface on 12c bus how to#
How to control a character I2C LCD with Arduino.How to create and display custom characters?.Other functions of the LiquidCrystal library.
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