LCD examples reference to SPI (fixed pins) not needed, unnecessary limitation to users

[Brimbard]

In the demos https://docs.arduino.cc/learn/electronics/lcd-displays#hello-world-example it is stated

As the Arduino is communicating with the display using SPI, pin 11 & 12 will change depending on what board you are using.

I could not find any reference to the SPI-module in the LiquidCrystal library. Please let me know if I may have overlooked something!

But, I successfully replaced the lines:

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

with:

#define RS_PIN 3
#define E_PIN  4
#define D4_PIN 5
#define D5_PIN 6
#define D6_PIN 7
#define D7_PIN 8
// 4 bit mode, connect RW to gnd, V0 gnd or variable resistor, 
// D0..D3 left open
// Backlight: K to gnd, A via 330 Ohm to +5V
LiquidCrystal lcd(RS_PIN, E_PIN, D4_PIN, D5_PIN, D6_PIN, D7_PIN);

This was successfully tested for all given examples (Autoscroll, Blink, Cursor, CustomCharacter, Display, Hello World, Scroll, SerialDisplay, setCursor, TextDirection) on a Nano-board and also on an Uno-board.

I would like to suggest removing this irritating reference (SPI would e.g., need a clock signal as well, CS (E_PIN) is usually not predefined, etc.) from the text and adjust the examples to indicate the freedom of choice for the pins.

PS: while the display showed reasonable contrast with the Nano and connecting V0 to ground, I had to use a variable resistor when connecting it to the Uno-board. The LCD got lit up so bright that no character could be recognized.

Also, on the SerialDisplay example a short hint for the user to switch off 'line end' and 'carriage return' might avoid some confusion for less experienced readers.