: Connect the SCL pin of the JHD2X16I2C module to Analog Pin A5 on the Arduino Uno.
If you run the simulation and the LCD remains blank (blue or green blocks, or nothing at all), here is the exclusive Proteus fix:
The standard Proteus library does not always ship with a native I2C LCD model. Users often simulate using a standard LCD + a separate PCF8574 chip. The version implies an all-in-one, pre-compiled model that behaves exactly like the physical I2C backpack. jhd2x16i2c proteus exclusive
Click the button located in the bottom-left corner of the Proteus workspace. The LCD screen should light up and display the designated text within seconds. Troubleshooting Common Simulation Glitches
Select the I2C LCD 16x2 module and place it on the schematic. Connect to Microcontroller: : Connect the SCL pin of the JHD2X16I2C
The JHD2X16I2C is a 2x16 character LCD module with an I2C interface (commonly using the PCF8574 or similar I/O expander) that simplifies connection to microcontrollers by reducing required pins to two (SDA, SCL). This guide explains how to add, configure, and simulate a JHD2X16I2C-style I2C LCD in Proteus for embedded development and testing.
The Proteus exclusive model supports CGRAM visualization. Load this code to see a custom smiley face: The version implies an all-in-one, pre-compiled model that
// Initialize the library with the specific pin mapping // Note: The JHD2x16 model often expects this specific constructor style LiquidCrystal_I2C lcd(I2C_ADDR, En_pin, Rw_pin, Rs_pin, D4_pin, D5_pin, D6_pin, D7_pin);
In the simulation, double-check that the backlight terminal is connected to positive voltage. Conclusion
LiquidCrystal_I2C lcd(0x27, 16, 2); // address 0x27
Which architecture are you pairing with the display?