Which sensors are used by the walk aid to time stimulation?

• A. Gyroscope and accelerometer
• B. Tilt sensor and accelerometer
• C. Heart rate monitor
• D. Pressure sensors

Answer: (B)

Timing the stimulation in a walk aid hinges on understanding how the leg is moving and where it is oriented. A tilt sensor tells the device the leg’s angle relative to gravity, helping distinguish when the leg is standing or swinging. An accelerometer measures changes in speed and direction, capturing the start of a step, the swing progression, and the cadence. Together, they provide real-time cues about the gait phase, allowing stimulation to be triggered at the right moment in the cycle. This combination works well because it covers both static posture and dynamic movement, offering robust timing across different speeds and strides. A gyroscope adds rotational data but isn’t as directly tied to gravity-based orientation; heart rate monitors track effort rather than immediate leg timing, and pressure sensors alone mainly reflect foot contact but can miss precise timing in variable steps.