DESCRIPTION
===========
This is a library for the Monochrome Nokia 5110 LCD Displays
These displays normally use SPI to communicate. 3 to 5 data-pins are required to
interface with the MCU. When using the minimum of three data-pins (DC/DIN/CLK),
the remaining pins are fixed. Using an I2C interface the display can be connected
to share the I2C bus (only two pins).
This library is based on the Adafruit PCD8544 Nokia 5110 LCD library,
but in addition to directly using SPI it allows the display to be driven
via the (shared) I2C bus which only requires two data-lines (SDA and SCL).
On the Arduino UNO, Nano and Pro Mini, these can be found on pins A4 and A5.
On the ESP8266 default pins are GPIO4 and GPIO05, but alternative pins can be
set in the call to begin(). E.g. on the ESP-01 board the serial pins can be used.
The I2C data is expanded to the recommended 5 pins using the PCF8274 I2C I/O
expander. A very affordable board and abundantly available board that
features a PCF8274 chip is the I2C backpack that is most commonly used
as interface to the 1602 and 2004 character LCD display modules.
Using only slightly different connections this interface board can be
used to connect the 48-84 Nokia 5110 dot-matrix LCD display module.
Module Pinout
=============
Nokia 5110 LCD Display module:
+------------------+
| ........ |
| +--------------+ |
| +--------------+ |
| | | |
| | | |
| | | |
| | | |
| +--------------+ |
| ........ |
+------------------+
12345678
Pin Description
1. RST--------- reset
2. CE---------- chip selection
3. DC---------- data/commands choice
4. DIN--------- serial data line
5. CLK--------- serial Clock Speed
6. 3.3V-------- VCC
7. LIGHT------- backlight control terminal
8. GND--------- power negative
PCF8574 I2C LCD driver:
+---------------------+
-SCL-+ ::: +---+ |
-SCA-+ +-+ |PCF| ''': LED+-
-VCC-+ |*| | | ..- jmp+-
-GND-+ +-+ +---+ |
+---------------------+
1234567890123456
||||||||||||||||
Pin Description
1. GND
2. VCC
3. Contrast (adjustable VCC->Pot->Pin3)
4. P0
5. P1
6. P2
7. not connected
8. not connected
9. not connected
10. not connected
11. P4
12. P5
13. P6
14. P7
15. VCC (for LED)
16. P3 (connected via LED jumper to J3Y (=S8050) transistor, sink)
See the included example for suggested connections of the display module
to the I2C LCD driver interface.
CREDITS
========
1. Credits to Adafruit for creating the original PCD8544 library and the
required Adafruit GFX library.
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Pick a Nokia 5110 display up today in the adafruit shop!
------> http://www.adafruit.com/products/338
Original version 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
2. Credits to Rob Tillaart for creating the PCF8574 library. This library
is not required, but useful for testing. I thank Rob for the inspiration.
Check out his large collection of Arduino libraries at
https://github.com/RobTillaart/Arduino
3. Modified library by Maxint R&D 2017.
BSD license applies. See below for more information
INSTALLATION
============
Download the required libraries (this one and the Adafruit GFX
library, see links below).
Use the Arduino IDE to add the .ZIP library file via the menu.
Alternatively copy all library files into a folder under your
arduinosketchfolder>/libraries/ folder and restart the IDE.
Also install the Adafruit GFX Graphics core library which does
all the circles, text, rectangles, etc;.
See the included example to learn more about using this library.
TROUBLESHOOTING TIPS
====================
- Read the tutorials and other documentation (see links below).
- Use the I2C scanner sketch to see if the PCF8574 I2C LCD driver
is properly connected and responding.
- Use Rob Tillaarts PCF8574 library examples to test the proper
functioning of the I/O expander.
- Use a multimeter to check pin voltages. Note: most Nokia 5110 and
PCF8574 modules are both 3.3V and 5V complient. However, the
contrast level on some 5110 modules may need to be higher when powered
by 3.3V.
- Test the Nokia 5110 module using the SPI connections and the
original library and pcdtest example. This modified library still
supports SPI interfacing. Make sure to use the proper constructor
and set the right pins as required.
- Check if all data-pins between display and interface modules are
properly connected, according the pins as defined in your sketch.
LINKS
=====
This library:
https://github.com/maxint-rd/I2C-PCF8574-PCD8544-Nokia-5110-LCD
Adafruit GFX Library:
https://github.com/adafruit/Adafruit-GFX-Library
Rob Tillaarts PCF8574 library:
https://github.com/RobTillaart/Arduino/tree/master/libraries/PCF8574
https://playground.arduino.cc/Main/PCF8574Class
Adafruit tutorials:
https://learn.adafruit.com/nokia-5110-3310-monochrome-lcd
https://learn.adafruit.com/adafruit-gfx-graphics-library/overview
Arduino I2C scanner sketches:
https://playground.arduino.cc/Main/I2cScanner
The original Adafruit PCD8544 Nokia 5110 LCD SPI library:
https://github.com/adafruit/Adafruit-PCD8544-Nokia-5110-LCD-library
HISTORY
=======
20170605 - first I2C version for ATmega 328
20170606 - added support for ESP8266
LICENSE
=======
This library inherits the BSD license from the original library which
limits the usage of this library to specific terms.
Read license.txt for more information.