usbdmx : The bus powered usb dmx interface : Schematic The schematic above is marked as revisino 1.2, but it is identical to the 1.3 revision with 1 excpetion. The is a 100R resistor on the RD & WR lines between IC2 & IC1. I will update the schematic as soon as I get a chance to reflect this. The following table lists all the parts you need to Schematics | USB DMX Interface for Flexible Lighting These circuits are comprised of PIC18F2455-I/SO USB Microcontroller that serves as the main processor of the system and manage the port communication. The PCF85103C-2T 256×8-bit CMOS EEPROM with I2C-bus interface is used as non-volatile storage of configurations and functions.