Luggage tracking system
A device, system, and method for tracking luggage in which the transmission of wireless signals by the device is turned off and on in response to sensor data, including the detection by a barometer of a decrease in atmospheric pressure of at least 13.8 kPa; lack of reception by a GPS receiver of a GPS signal and detection by an accelerometer and magnetometer of low frequency, low amplitude vibrations; and/or reception by a Bluetooth module of GPS coordinates transmitted by another luggage tracking device.
1. A luggage tracking device, comprising:
a communications module for transmitting and receiving data with a mobile device over a network selected from one or more of a cellular network, a wireless local area network, and a wireless wide area network;
a global positioning system (GPS) module capable of receiving GPS signals from one or more GPS satellites;
a Bluetooth module capable of transmitting and receiving data using a Bluetooth standard;
a barometer;
a 3-axis accelerometer;
a 3-axis magnetometer;
a memory;
a central processing unit (CPU) in communication with the communications module, the GPS module, the Bluetooth module, the barometer, the 3-axis accelerometer, the 3-axis magnetometer and the memory; and
instructions stored in the memory and executable by the CPU, wherein the CPU causes the instructions to operate to cease the transmission of data by the communications module and the Bluetooth module upon
detection by the 3-axis accelerometer and the 3-axis magnetometer of vibrations having a frequency of between 10 Hz and 30 Hz and an amplitude of between 0.4 G and 0.6 G, and lack of reception by the GPS module of a GPS signal from at least three satellites.
2. The luggage tracking device of claim 1 , wherein the communications module comprises one or more of a cellular network communications module, a wireless local area network communications module, and a wireless wide area network module.
3. The luggage tracking device of claim 1 , wherein the wireless local area network communications module operates using a WiFi standard.
4. The luggage tracking device of claim 1 , wherein the device includes a cellular network communications module and a wireless local area network communications module that operates using the standard.
5. The luggage tracking device of claim 1 , wherein the wireless wide area network communications module operates using a LoRa standard.
6. The luggage tracking device of claim 1 , further comprising radio frequency identification device (RFID) sensor.
7. The luggage tracking device of claim 1 , wherein the Bluetooth module transmits and receives data using radio waves having frequencies between 2.4 GHz and 2.485 GHz.
8. A method for turning on wireless communications of a luggage tracking device, comprising the steps of:
periodically detecting atmospheric pressure;
upon detecting an increase in the atmospheric pressure of 2 psi, detect vibrations with an accelerometer and a magnetometer;
upon detecting the vibrations having a frequency of between 5 Hz and 40 Hz and an amplitude of between 0.3 G and 0.7 G, determine whether a global positioning system (GPS) signal from at least 3 satellites is received; and then
upon determining that the GPS signal from at least 3 satellites is received, begin transmitting signals from a communications module comprising circuitry for transmitting and receiving data over a network selected from one or more of a cellular network, a wireless local area network, and a wireless wide area network.
9. The luggage tracking device of claim 8 , wherein the wireless local area network operates using a WiFi standard.
10. The luggage tracking device of claim 8 , wherein the wireless wide area network operates using a LoRa standard.