Bit-banging the FTDI-USB Module

This article describes the electrical design and software requirements for a keyless entry control panel comprised of a numeric entry pad, an LCD display, relay contacts for unlocking a door and a USB interface. Even though this writing will delve into the inner workings of FTDI’s FT2232H and its Bit-Bang Mode, understanding the technology will require neither an in-depth knowledge of USB nor the use of a microcontroller!