Patent ID: 7899408
Filing Date: 2011-03-01
Classification: A63B

Abstract:
1. A circuit for transmitting a RFID signal while conserving the battery power for the circuit, the circuit comprising: a battery having no more than 225 milliamp hours of capacity; a microprocessor in electrical communication with the battery, the microprocessor operating during a sleep mode, a sampling mode, an analysis mode, a monitoring mode and a transmission mode; a multi-axis accelerometer for determining movement, monitoring movement and communicating the movement to the microprocessor, the multi-axis accelerometer in electrical communication with the microprocessor, the power for the multi-axis accelerometer drawn from the battery, the multi-axis accelerometer only active during the sampling mode, the analysis mode and the monitoring mode; a radiofrequency component in electrical communication with the microprocessor, the radiofrequency component operating at 2.4 giga-Hertz, the power for the radiofrequency component drawn from the battery, the radiofrequency component only operable during a transmission mode and transmitting a signal from the radiofrequency component during the transmission mode, the signal comprising data related to the movement monitored by the multi-axis accelerometer; wherein the circuit consumes less than 600 nano-amps during the sleep mode, the sleep mode having a time period ranging from 10 seconds to 30 seconds; wherein the circuit consumes less than 15 micro-amps during the sampling mode; wherein the circuit consumes less than 50 micro-amps during the analysis mode; wherein the circuit consumes less than 200 micro-amps during the monitoring mode; wherein the circuit consumes less than 12 milli-amps during the transmission mode; wherein the microprocessor is configured to deactivate transmissions of the signal when a threshold number of signals are transmitted and a receipt signal is not received.