| CPC G06F 3/0446 (2019.05) [G06F 3/0443 (2019.05); H01Q 1/2266 (2013.01); G06F 3/04166 (2019.05)] | 16 Claims |
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1. An apparatus, comprising:
a set of electrodes incorporated into a capacitance measuring circuit;
a high pass filter with a cutoff frequency incorporated into the capacitance measuring circuit;
wherein the capacitance measuring circuit is configured to transmit a wireless signal to an external device when the capacitance measuring circuit receives a driving signal with a frequency greater than the cutoff frequency of the high pass filter;
a processor and memory, wherein the memory stores programmed instructions which cause the processor, when executed, to:
transmit the wireless signal using the capacitance measuring circuit at a first time; and
measure a capacitance signal using the capacitance measuring circuit during a second time;
wherein the duration of the first time and the duration of the second time change in response to programmed instructions executable by the processor;
wherein changing the duration of the first time is based, at least in part, on the capacitance signal measured with the first electrode and the second electrode.
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