Synchronized voltage controlled oscillator lap counting circuit

A lap counting circuit, comprising:

• a bearing resolver circuit including:
• a Hall-effect sensor element providing differential voltage output signals in response to an external magnetic field;
• a differential amplifier receiving said differential voltage output signals and providing a single amplified output signal;
• a voltage controlled oscillator receiving said single amplified output signal and providing a voltage controlled oscillator output signal;
• a pedometer providing a repetitive pulsed-output signal in accordance with movements of a user;
• a micro-controller receiving said repetitive pulsed-output signal from said pedometer and said voltage controlled output signal from said voltage controlled oscillator;
• wherein said micro-controller samples said voltage controlled output signal in synchronization with the repetitive pulsed signal output from the pedometer to resolve bearing directions based on frequencies of the voltage controlled output signal;
• and
• wherein said micro-controller tracks the bearing direction to determine when a lap is completed.