Patent ID: 8581886

Claim:
A method comprising: receiving a signal at a stylus, the stylus being operable to wirelessly transmit signals to and receive signals from a device, the stylus comprising a plurality of electrodes disposed in a tip of the stylus; comparing a first value of the signal to a first threshold; determining whether to start a timing period based at least in part on comparing the first value of the signal to the first threshold; if the timing period is started: comparing a second value of the signal to a second threshold; determining whether to stop the timing period based at least in part on comparing the second value of the signal to the second threshold; if the timing period is stopped: determining whether a duration of the timing period is within a pre-determined range of timing period values; processing the signal if the duration of the timing period is within the pre-determined range of timing period values; and receiving a second signal at the stylus if the duration of the timing period is not within the pre-determined range of timing period values; if the timing period is not stopped, receiving a second signal at the stylus if the duration of the timing period meets or exceeds a pre-determined time-out length.