Bit-banging the FTDI-USB Module
Taking advantage of little-known features of FTDI’s USB ICs

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!
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