Documentation

// LCD1602 16x2 LCD Display - Arduino Example
// 4-bit mode using LiquidCrystal library
// RS = 12, E = 11, D4 = 5, D5 = 4, D6 = 3, D7 = 2

#include <LiquidCrystal.h>

// (rs, enable, d4, d5, d6, d7)
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // Tell the LCD it has 16 columns and 2 rows
  lcd.begin(16, 2);
  lcd.print("Hello, World!");

  lcd.setCursor(0, 1);
  lcd.print("ShillehTek LCD");
}

void loop() {
  // Move the cursor and print the seconds counter on row 2
  lcd.setCursor(0, 1);
  lcd.print("Uptime: ");
  lcd.print(millis() / 1000);
  lcd.print("s   ");
  delay(1000);
}

#!/usr/bin/env python3
# LCD1602 16x2 LCD Display - Raspberry Pi Example
# Uses RPLCD library: pip install RPLCD

from RPLCD.gpio import CharLCD
from RPi import GPIO
import time

lcd = CharLCD(
    pin_rs=25,
    pin_e=24,
    pins_data=[23, 17, 27, 22],
    numbering_mode=GPIO.BCM,
    cols=16,
    rows=2,
    dotsize=8
)

try:
    lcd.write_string("Hello, World!")
    lcd.cursor_pos = (1, 0)
    lcd.write_string("ShillehTek LCD")
    while True:
        lcd.cursor_pos = (1, 0)
        lcd.write_string("Time: {:>4}s   ".format(int(time.time()) % 10000))
        time.sleep(1)
except KeyboardInterrupt:
    pass
finally:
    lcd.close(clear=True)
    GPIO.cleanup()

# LCD1602 16x2 LCD Display - Pico MicroPython Example
# Direct GPIO bit-banged 4-bit mode (no library needed).

from machine import Pin
import time

RS = Pin(15, Pin.OUT)
E  = Pin(14, Pin.OUT)
D4 = Pin(13, Pin.OUT)
D5 = Pin(12, Pin.OUT)
D6 = Pin(11, Pin.OUT)
D7 = Pin(10, Pin.OUT)

def pulse_e():
    E.value(1); time.sleep_us(1); E.value(0); time.sleep_us(50)

def write_nibble(value):
    D4.value((value >> 0) & 1)
    D5.value((value >> 1) & 1)
    D6.value((value >> 2) & 1)
    D7.value((value >> 3) & 1)
    pulse_e()

def write_byte(value, mode_data):
    RS.value(1 if mode_data else 0)
    write_nibble(value >> 4)
    write_nibble(value & 0x0F)

def cmd(c):  write_byte(c, False); time.sleep_ms(2)
def data(c): write_byte(c, True);  time.sleep_us(50)

def init_lcd():
    time.sleep_ms(50)
    write_nibble(0x03); time.sleep_ms(5)
    write_nibble(0x03); time.sleep_us(150)
    write_nibble(0x03); time.sleep_us(150)
    write_nibble(0x02)
    cmd(0x28)  # 4-bit, 2 line, 5x8
    cmd(0x0C)  # display on, no cursor
    cmd(0x06)  # entry mode
    cmd(0x01)  # clear

init_lcd()
for ch in "Hello, World!":
    data(ord(ch))
cmd(0xC0)  # row 2
for ch in "ShillehTek LCD":
    data(ord(ch))