IclcdBegin() sets the address and screen dimensions of a PCF8574 character LCD.

bool IclcdBegin(uint8_t address, uint8_t columns, uint8_t rows, bool backlight = true, uint8_t device = 0)

void setup() {
  Serial.begin(115200);
 
  if (!IclcdBegin(0x27, 20, 4)) {  // Set the address and dimensions of the PCF8574 character LCD.
    Serial.println(F("CLCD connection failed"));
    return;
  }
 
  IclcdSetCursor(0, 0);  // Move the cursor to the specified column and row.
  IclcdPrint(F("ILOGICS Iclcd"));  // Print a string or number to the LCD.
  IclcdSetCursor(0, 1);  // Move the cursor to the specified column and row.
  IclcdPrint(1234);  // Print a string or number to the LCD.
  IclcdSetCursor(6, 1);  // Move the cursor to the specified column and row.
  IclcdPrint(12.34, 2);  // Print a string or number to the LCD.
}
 
void loop() {
}

• PCF8574 connections use the same mapping as the existing CLCD library: P0=RS, P1=R/W, P2=Enable, P3=backlight, P4~P7=LCD D4~D7.
• Verify the LCD module's actual I²C address using its settings and I²C scan results.
• SDA/SCL can share the bus with other I²C devices, but addresses must not overlap.
• Do not run Wire transfers or I²C slave callbacks concurrently with Iclcd…(). Iclcd transfers run at 100 kHz and then restore the previous TWI settings.
• On MPAINO, using D20/D21 for external interrupts prevents simultaneous I²C use.
• IclcdCommand() can change the LCD state directly. Use it only if you understand HD44780 commands.

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