This library provides a lightweight software-only implementation for a single wire serial point-to-point link between two devices.

OnePin uses a single digital I/O line and ground to communicate between a primary and a secondary device. The primary always initiates and controls the communication.

This link interface is useful to implement simple message transfers between a primary device and a less capable secondary device, such as custom sensors or actuators with simple processor control.

This implementation borrows heavily from, and simplifies, the Dallas Semiconductor/Maxim 1-Wire® specification. Differences include:

Links are point-to-point (one Primary and one Secondary) rather than bus based.
Omitting a bus also eliminates the need for device identification infrastructure.
Timing parameters and handshaking protocol.

See the links below for more information on this signaling protocol and how it is implemented using this library.