. If your code doesn't match the component's internal address, communication fails entirely. Missing Pull-up Resistors
: Often based on the Hitachi HD44780 driver IC, paired with an I2C "backpack" module. Customization : Many modules include a potentiometer on the back for contrast adjustment and a jumper for backlight control Arduino Forum Using JHD-2X16-I2C in Proteus jhd-2x16-i2c proteus
Add 4.7kΩ resistors from SDA to VCC and SCL to VCC. Proteus does not always emulate internal pull-ups. Customization : Many modules include a potentiometer on
If the simulation runs but the LCD shows only the top row of solid black boxes (or nothing at all): In Proteus, you can adjust the "Contrast" property
: In a real circuit, the adapter has a potentiometer for contrast. In Proteus, you can adjust the "Contrast" property in the component settings if the text appears invisible. How to use it in Proteus