A method and device for halting the extension or retraction of a retractable awning comprises a sensor coupled to a processor that commands awning extension and retraction. The sensor senses a motion parameter, such as acceleration, which is associated with extension or retraction motion of a retractable awning and generates corresponding respective extension or retraction motion parameter signals. The processor calculates an acceleration rate of change and/or a tilt angle from the motion parameter signals received from the sensor, and halts awning extension or retraction by generating and sending a stop signal when the acceleration rate of change or tilt angle meets at least one predetermined criterion.