You are having problems because modified Library tries to Initialize some other Pins (D3,4,5,6,7). You can switch pure SPI only Library that forked from the original. This only software change, no need to change pins for LCD nor Shift Register.

https://github.com/omersiar/ShiftedLCD

Simply you can not. This is because hardware SPI uses those pins. But you can drive your all devices on the same SPI bus (except for the Slave Select SS pin – Latch Pin or Pin 9 in this article).

I mean you can use both Ethernet Shield and the LCD at the same pins, and grab this Library

https://github.com/omersiar/ShiftedLCD

https://www.arduino.cc/en/Reference/SPI

You need modified Library for that. I exactly modified original Library for this specific reason.

https://github.com/omersiar/ShiftedLCD

Hello Hasan,

You can create two lcd Instance. You really do not need send 8 bit data.

// initialize the library with the number of the sspin
// (or the latch pin of the 74HC595)
LiquidCrystal lcd1(9);
// Create second LCD Instance
LiquidCrystal lcd2(8);

// You now ready to send data to LCD which you want just

lcd1.print(“LCD 1 is Running”);
lcd2.print(“LCD 2 is also Run”);

https://github.com/omersiar/ShiftedLCD

First of all, thank you Stan, for the great article. It’s really good structured, clean, polished.

I forked original code from Juan Hernandez and created simple, modernized, SPI only Library. ShiftedLCD is ready to use for those who want to use their other SPI devices like SD, Ethernet, RFID, etc together with Shifted LCDs.

Original code was modified both parallel and SPI (serial) communication, which leads a bug that other digitalPins on Arduino UNO state is not know (for example if you have a INPUT pin with PULLUP resistor is enabled, you couldn’t determine its state (HIGH or LOW) when it’s floating) this tiny bug bothered me much.

I modified the Library to reduce complications, like collision with native Library, removed Parallel communication support. Also referenced this page for Pinouts and configuration (better than original playground page), and I am going to edit Playground link.