JHD1313M1 JHD1313M1 has two I2C addreses: one controls the HD44780-based display, and the other controls only the backlight. Software Stack Implementation Jhd1313m1 User Space Library UPM Jhd1313m1 User Space Library MRAA Jhd1313m1 User Space I2C Library Jhd1313m1 Kernel Space I2C Driver