Figure 3-4. Minimum Signal Deviation for Reliable Gesture Detection
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Detection Sensitivity
To adjust Detection Sensitivity, proceed as follows:
•
For maximum robustness to noise:
1.
Perform gestures as far away from the sensitive area as allowed by the application.
2.
Reduce Detection Sensitivity until gestures are no longer detected.
3.
At this point, amplitude from performed gestures is not enough to trigger gesture start. This is
approximately the minimum sensitivity of the application.
•
For maximum system sensitivity:
1.
Perform gestures close to the sensitive area.
2.
Increase Detection Sensitivity until gestures are no longer detected.
3.
At this point, noise amplitude is enough to trigger gesture start. Noise is mixed with the performed
gesture signal and no valid gesture is recognized. This is approximately the maximum sensitivity of
the application.
Gesture Suppression Time
Gesture Suppression Time is a parameter utilized to prevent a user unintentionally triggering a gesture
after touching the sensor and then removing the hand. This parameter can prevent that situation by
blocking all gestures during a certain time after sensor touch is released. While gestures are blocked, the
time is adjusted with this slider 1 taking values from 0 to 1.25s.
If Gesture Suppression Time is active (>0), touch detection also aborts ongoing gesture recognition.
If the Touch Detection feature is disabled, this feature has no impact.
MGC3140
Tuning
©
2018 Microchip Technology Inc.
User Guide
DS40002055A-page 11
