Method and apparatus for self-powered vehicular sensor node using magnetic sensor and radio transceiver
A vehicular sensor node, circuit apparatus and their operations. Power from power source is controlled for delivery to radio transceiver and magnetic sensor, based upon a task trigger and task identifier. The radio transceiver and the magnetic sensor are operated based upon the task identifier, when the task trigger is active. The power source, radio transceiver, magnetic sensor, and circuit apparatus are enclosed in vehicular sensor node, placed upon pavement and operating for at least five years without replacing the power source components. Magnetic sensor preferably uses the magnetic resistive effect to create magnetic sensor state. Radio transceiver preferably implements version of a wireless communications protocol. The circuit apparatus may further include light emitting structure to visibly communicate during installation and/or testing, and second light emitting structure used to visibly communicate with vehicle operators. Making filled shell and vehicular sensor node from circuit apparatus.
1. An apparatus, comprising:
an integrated circuit adapted to maintain a clock count; and
said integrated circuit is further adapted to perform at least one of
control power delivered to a radio transceiver and to a sensor based upon said clock count; and
operate said radio transceiver and a sensor based upon said clock count.
2. The apparatus of claim 1 , wherein said integrated circuit is further adapted to perform both:
control said power delivered to said radio transceiver and to said sensor based upon said clock count; and
operate said radio transceiver and said sensor based upon said clock count.
3. The apparatus of claim 1 , wherein said integrated circuit adapted to maintain said clock is further adapted to create a task trigger and a task identifier.
4. The apparatus of claim 3 , wherein said integrated circuit further adapted to control said power comprises
said integrated circuit adapted to deliver said power to said radio transceiver and said sensor based upon said task trigger and said task identifier.
5. The apparatus of claim 3 , wherein said integrated circuit is further adapted to operate said radio transceiver and said sensor based upon said task trigger and said task identifier.
6. The apparatus of claim 1 , wherein said integrated circuit further comprises said radio transceiver.
7. The apparatus of claim 1 , wherein said integrated circuit is adapted to receive at least part of said power from a power source including at least one battery.
8. The apparatus of claim 7 , wherein said integrated circuit is further adapted to receive said power from a photocell.
9. The apparatus of claim 1 , wherein said radio transceiver implements a version of at least one wireless communications protocol.
10. The apparatus of claim 9 , wherein said wireless communications protocol includes International Electrical and Electronic Engineers (IEEE) 802[period]15 communications standard.
11. The apparatus of claim 10 , wherein said wireless communications protocol includes said IEEE 802[period]15[period]4 communications protocol.
12. The apparatus of claim 1 , wherein said sensor is configured to sense a vehicle.
13. The apparatus of claim 1 , wherein said sensor includes a magnetic sensor.
14. The apparatus of claim 1 , wherein said sensor includes an amplifier.
15. The apparatus of claim 1 , wherein said integrated circuit includes at least one instance of at least one member of the group consisting of a computer, a field programmable logic device and a finite state machine.
16. The apparatus of claim 15 , wherein integrated circuit further comprises said computer controllably coupled to a power control circuit configured to receive power from a power source.
17. The apparatus of claim 1 , wherein said integrated circuit further comprises a clock timer to maintain said clock count.
18. The apparatus of claim 1 , wherein said integrated circuit is configured to adjust said clock count based upon reception of a global clock count.
19. The apparatus of claim 18 , wherein said global clock count is received by said radio transceiver.
20. The apparatus of claim 1 , wherein said integrated circuit adapted to maintain said clock count comprises
means for maintaining said clock count;
wherein said integrated circuit adapted to control said power delivered to said radio transceiver and to said sensor based upon said clock count comprises
means for controlling power delivered to said radio transceiver and to said sensor based upon said clock count; and
wherein said integrated circuit adapted to operate said radio transceiver and said sensor based upon said clock count comprises
means for operating said radio transceiver and said sensor based upon said clock count.
21. The apparatus of claim 1 , further comprising a circuit apparatus comprising said integrated circuit.