How To Find Out I2c Module Address || How to Scan I2C Address in Arduino

The I2C address of your LCD depends on the manufacturer, as mentioned earlier. If your LCD has a PCF8574 chip from Texas Instruments, its default I2C address is 0x27Hex. If your LCD has a PCF8574 chip from NXP semiconductors, its default I2C address is 0x3FHex.
A simple means of checking if a specific I2C slave device is using an 8-bit address is to check the range of the address. A 7-bit address should always fall between 0x07 (7) and 0x78 (120). Generally, if your address is outside of this range, the vendor of the I2C slave device has likely assigned an 8-bit I2C address
I2c Module Address code:
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*How To Use LCD2004 LCD 20x4 Display With I2C Module In Arduino | " SOLVED " My LCD doesn't show Text*
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