Proximity Gesture Applications In Automotive HMI: Page 5 of 6

January 20, 2016 //By Sivaguru Noopuran, Cypress Semiconductor
Proximity Gesture Applications In Automotive HMI
In this article Cypress Semiconductor look at the use of capacitive proximity sensors in automotive applications. These sensors can be used for simple actions such as keyless entry or turning on cabin lights and sensing an individual in the vehicle. However in this article Cypress focus on how you can now use them as inputs into systems such as media players and navigation systems with vehicles by using the same principles.
instead of moving the hand away from the system in one go, we stop the hand on the last sensor just before moving out of the range of that senor. The command is issued as long as the hand stays over the sensor.

A rawcounts plot for top and bottom sensors for this sticky (top → bottom) gesture is shown in Figure 5. The bottom sensor continues to stay triggered for more time after the top sensor stops sensing the hand. This indicates that the hand has stopped at the bottom sensor instead of continuing straight down. To issue the sticky command, we check if the top sensor was triggered first, followed by triggering of the bottom sensor. Then the top sensor no longer senses a hand while the bottom sensor still continues to sense a hand near it. After the hand stays near the bottom sensor for more than a threshold of time, the sticky command is issued as long as the bottom sensor senses the hand near it. Similarly, other gestures too can be modified to have ‘sticky’ feature. This enables gestures to replace the up/down button functions completely.

Figure 5. Signal plot for top and bottom sensors for sticky (top → bottom) gesture. The signal on the bottom sensor stays on, longer indicating a ‘sticky’ gesture

The hand can start over any of the sensors and then traverse in a circular pattern in either a clockwise or anticlockwise direction over the other sensors. The loop is completed when the hand reaches the sensor on which it started then exits the circular loop gesture by moving away. For example, the hand can move over the right sensor and then move clockwise over the bottom, left and top sensors in that order before exiting the loop over the right sensor again. Similarly, a counterclockwise loop can be completed by reversing the direction of movement of the hand. Also, multiple

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