Proximity switch assembly and method therefor
A proximity switch assembly is provided. The proximity switch assembly includes a proximity switch comprising a proximity sensor providing an activation field, and control circuitry monitoring a signal responsive to the activation signal and determining an activation of the switch, detecting a first peak value above a threshold when the signal is not stable followed by a drop and a subsequent rise to a second peak value followed by a sharp drop.
1. A proximity switch assembly comprising:
a proximity switch comprising a proximity sensor providing an activation field; and
control circuitry monitoring a signal responsive to the activation field and determining an activation of the switch based on detecting a first peak value above a threshold when the signal is not stable, followed by a drop and a subsequent rise to a second peak value followed by a sharp drop, wherein the control circuitry further delays recalibration of the switch assembly by a predetermined time period when the signal is detected dropping fast.
2. The switch assembly of claim 1 , wherein the delay in recalibration is at least two seconds.
3. The switch assembly of claim 1 , wherein the control circuitry further determines the signal drops below a baseline value.
4. The switch assembly of claim 1 , wherein the drop from the first peak value exceeds a noise threshold.
5. The switch assembly of claim 4 , wherein the drop from the first peak value exceeds at least twice the noise threshold.
6. The switch assembly of claim 1 , wherein the proximity sensor comprises a sensor circuit formed on a flexible substrate.
7. The switch assembly of claim 1 , wherein the proximity switch comprises a capacitive switch comprising a capacitive sensor.
8. The switch assembly of claim 1 , wherein the proximity switch is installed in a vehicle for use by a passenger of the vehicle.
9. A method of determining activation of a proximity switch comprising:
generating an activation field with a proximity sensor;
monitoring amplitude of a signal generated in response to the activation field;
detecting a first peak value of the signal when the signal is not stable, followed by a drop in the signal, then a subsequent rise to a second peak value, followed by a sharp drop below a baseline value;
delaying recalibration of the switch by a fixed time when the signal drops below the baseline value; and
determining an activation of the switch based on the detecting step.
10. The switch assembly of claim 9 , wherein the delay in recalibrating is at least two seconds.
11. The method of claim 9 , wherein the drop from the first peak value exceeds a noise threshold.
12. The switch assembly of claim 11 , wherein the drop from the first peak value exceeds at least twice the noise threshold.
13. The method of claim 9 , wherein the proximity sensor comprises a sensor circuit formed on a flexible substrate.
14. The method of claim 9 , wherein the proximity switch comprises a capacitive switch comprising a capacitive sensor.
15. The method of claim 9 , wherein the proximity switch is installed on a vehicle for use by a passenger in the vehicle.