NU32v2: Nokia 5110 LCD

*** UNDER CONSTRUCTION ***

The Sparkfun Nokia 5110 controlled by the NU32v2.

The Nokia 5110 from Sparkfun is a 84 x 48 pixel monochrome LCD and breakout board. It is controlled using SPI communication and several digital outputs.

Overview

An LCD is a convenient tool for communication data using text. The Nokia 5110 provides 6 rows of 12 characters of text, or can be used to draw in a 84 x 48 pixel space. The contrast is digitally controlled and 4 white LEDs behind the LCD provide a backlight.

The LCD requires five communication pins from a microcontroller: SPI CLK and SDO, and three digital outputs. The LCD is powered with 3.3V.

Details

Datasheet

Example schematic when communicating with the NU32v2:

• LCD 1-Vcc -----> NU32v2 3.3V
• LCD 2-GND -----> NU32v2 GND
• LCD 3-SCE -----> NU32v2 E2
• LCD 4-RST -----> NU32v2 E1
• LCD 5-D/C -----> NU32v2 E0
• LCD 6-DNK(MOSI) -----> NU32v2 F8 (SDO3)
• LCD 7-SCLK -----> NU32v2 D15 (SCK3)
• LCD 8-LED -----> 330 ohm -----> 5V
  • Note: hooking up 8-LED is only required if you want to use the backlight

Library Functions

Code: Nokia5110.h, Nokia5110.c

Full example: All example code

Nokia5110.h sets up control pins on E0, E1 and E2. These may be changed if desired. The file also contains function prototypes, constants, and a 96 x 5 element lookup array of ASCII characters.

Nokia5110.c contains the following functions:

• LcdCharacter - used to write an individual ASCII character
• LcdClear - clears the entire LCD
• LcdInitialize - Initializes SPI3 (can be changed if desired) and sends the startup commands to the LCD
  • The second command sent (LCD Vop) sets the contrast of the LCD and can be altered for more or less contrast
• LcdString - writes a string of characters to the LCD
• LcdWrite - sends individual commands to the LCD
  • Sending commands before the LCD is ready for them will make the LCD miss them, so 1000 Nop()s are called between commands
• gotoXY - places the cursor at an x pixel (0-84) and y character (0-5)
• setPixel - turns on a pixel at x (0-84) and y (0-48)

Sample Code

Initialize and clear the LCD:

  LcdInitialize();
  LcdClear();

Go to the leftmost side of the screen on the second line and write 'Hello'

  gotoXY(0,1);
  LcdString("Hello");

Write the value of a variable:

  char str[5];
  sprintf(str, "i=%d", i);
  LcdString(str);

Turn on a pixel at (20,35):

  setPixel(20,35,1);

More Information

The sample code in All example code will create the image at the top of this page. Sending the NU32v2 an 'a' over serial will clear the LCD.