Adafruit PCD8544 Nokia 5110 LCD Library 
This is a library for our Monochrome Nokia 5110 LCD Displays
Pick one up today in the Adafruit shop!
------> https://www.adafruit.com/product/338
These displays use SPI to communicate, 4 or 5 pins are required to
interface.
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, check license.txt for more information.
All text above must be included in any redistribution.
To install, use the Arduino Library Manager to search for 'Adafruit VCNL4010'
and install the library.
You will also need the Adafruit GFX Graphics core which does all the circles, text, rectangles, etc.
You can get it by searching for 'Adafruit GFX' in the Arduino Library Manager or check it out here:
https://github.com/adafruit/Adafruit-GFX-Library