I2C LCD Screen Add-on
You can connect an I2C 16x2 characters LCD screen to the Gotek display port.
These kind of I2C LCD board is compatible with the firmware :
Any I2C address is supported : The firmware scan automatically the I2C bus at power up (0x20-0x27 and 0x38-0x3F address range scanned) So there is no specific requirement about the I2C address setting.
To connect the I2C LCD, you have to connect SDA & SCL at the J7 connector (see below). Please note that 2 additional 4.7Kohms pull up resistors (+5V) are needed on SCL & SDA. the +5V and GND wire can be connected on the programming connector (see below) :
If you want to build the I2C board yourself, here is the schematic: https://hxc2001.com/download/floppy_drive_emulator/Ext_Slim_HxC_Floppy_Emulator_I2C_LCD_Schematic.pdf
Possible +5V source on the PCB (on the programming connector):
_____________________________ | -+--- NC -+--- GND O J3 (BOOT0) -+--- GND O VCC3V3 -+--- +5V OO TX | +5V OO RX | GND OO RST |-- | | | |
SCL & SDA position on J7 :
_____| | | | USB | |_____| OO______________________| SDA OO|SCL GND OO|VCC3V3 J7| | __________|
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