IclcdPrint() prints a string or number on the LCD.

bool IclcdPrint(const char value[], uint8_t device = 0)
bool IclcdPrint(const String& value, uint8_t device = 0)
bool IclcdPrint(const __FlashStringHelper* value, uint8_t device = 0)
bool IclcdPrint(char value, uint8_t device = 0)
bool IclcdPrint(unsigned char value, int base = DEC, uint8_t device = 0)
bool IclcdPrint(int value, int base = DEC, uint8_t device = 0)
bool IclcdPrint(unsigned int value, int base = DEC, uint8_t device = 0)
bool IclcdPrint(long value, int base = DEC, uint8_t device = 0)
bool IclcdPrint(unsigned long value, int base = DEC, uint8_t device = 0)
bool IclcdPrint(double value, int digits = 2, uint8_t device = 0)

void setup() {
  bool lcd1 = IclcdBegin(0x27, 20, 4, true, 0);
  bool lcd2 = IclcdBegin(0x26, 16, 2, true, 1);
 
  if (lcd1) IclcdPrint("MAIN", 0);
  if (lcd2) IclcdPrint("SUB", 1);
}
 
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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