After looking at the most frequently used buses that a developer can find on an embedded computer (USB, I²C, and SPI), it's time to present a less famous, but not less important, communication bus: the 1-Wire bus (called one-wire and usually abbreviated as W1 or OW).

Even if this bus is quite slow with respect to other buses, it's interesting because it permits users to communicate with a remote device using only one wire. This allows you to simplify the connections between the CPU and its peripherals, giving the designer the possibility to have the most economical and simple way to add electronic devices for identification, authentication, and delivery of calibration data or manufacturing information to a computer board.