Check that the Wire.h library is included and that your connections (SDA/SCL) are correct.
If the I2C debugger shows successful transmissions but the LCD shows nothing, check your LiquidCrystal_I2C pin mapping constructor. Different versions of the library assume different internal tracks between the PCF8574 and the LCD. Ensure your pin mappings mirror the software configuration. jhd-2x16-i2c proteus
int main() lcd_init(); lcd_print("Hello, World!"); return 0; Check that the Wire
The is one of the most widely used alphanumeric display interfaces for electronics prototyping. It integrates a traditional 16x2 character display panel with a PCF8574-based I/O expander microchip , transforming a complex 4-bit or 8-bit parallel wiring requirement into a simple, two-wire Inter-Integrated Circuit (I2C) serial bus communication layout. Ensure your pin mappings mirror the software configuration
: I2C (Inter-Integrated Circuit), which simplifies wiring significantly by reducing the pin count to four: VCC, GND, SDA, and SCL. On-board Controller
In the Arduino IDE, go to and check the box for Show verbose output during: compilation . Click Verify/Compile .