: Instead of using 6–10 digital pins in parallel mode, this I2C version uses only 4 connections: VCC (5V), GND, SDA , and SCL .
The I2C address of PCF8574 in Proteus is typically (for A2=A1=A0=0). Adjust depending on pin connections in the schematic. jhd-2x16-i2c proteus
Ensure your simulation "Clock Frequency" (right-click the MCU) matches your code's timing (typically 8MHz or 16MHz). : Instead of using 6–10 digital pins in
To run the simulation, the library is required. the library is required.