SYSTEMS AND METHODS FOR WIRELESS CONTROL OF EQUIPMENT

• US 20090303013A1
• Filed: 06/05/2009
• Published: 12/10/2009
• Est. Priority Date: 06/05/2008
• Status: Abandoned Application

• Current Assignee: University of Akron
• Original Assignee: University of Akron
• Inventors: Edgerton, John W.
• Application Number:
  US12/479,381
• Publication Number:
  US 20090303013A1
• Time in Patent Office: Days
• US Class Current: 340/10.100
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10079 the collision being resolved in the spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
• CPC Class Codes: H04Q 2213/13095 PIN / Access code, authentication

Abstract

Systems and methods for wirelessly controlling equipment or apparatus by employing radio frequency identification (RFID) technology. The systems and methods provide the capability to manually or automatically select an RFID tag or change the encoded information in an RFID tag to wirelessly change the control state of a piece of equipment or an apparatus. The system includes an RFID based selector including at least one RFID tag, and an RFID reader capable of wirelessly reading RFID codes from the RFID tags of the RFID based selector. The system further includes a control mechanism capable of changing a control state of said equipment or apparatus in response to said read RFID codes. To expand the system capabilities yet keep power requirements at the selector to a minimum, methods are included of passive addressing of many pushbuttons in the selector. Wireless and battery free selectors are explained. Utilizing the inherent ID code of the tag permits management of which selectors are virtually connected.

Claims

1. A method to wirelessly control an apparatus or device, said method comprising:

Providing the functionality of at least one RFID tag at the point of control and the functionality of an associated reader in conjunction with at least one electrical apparatus,

selectively causing at least a portion of the information on the at least one RFID tag to be read by the associated reader, and through proper interface, to produce a control command which is delivered to the at least one electrical apparatus to cause the intended action by or in the apparatus.

2. The method of claim 1, further comprising the method of:

using at least one shielding system to selectively isolate the at least one tag from, or expose it to the radio frequency interrogation signal from the associated reader.

3. The method of claim 2 wherein the method of exposing the at least one RFID tag to the interrogation signal causes the associated reader to read the presence of the tag, upon which at least one control action is executed.

4. The method of claim 2, wherein the method of isolating the at least one RFID tag causes the associated reader to read the absence of the tag, upon which at least one control action is executed.

5. The method of claim 2 wherein the method of exposing the at least one RFID tag to the interrogation signal causes the associated reader to read the presence of the tag, upon which at least one first control action is executed, and the step of isolating the at least one RFID tag causes the associated reader to read the absence of the tag, upon which at least one second control action is executed.

6. The method of claim 2, wherein the method of using a shielding system selectively isolates at least one and exposes at least one of a plurality of RFID tags out of a predetermined plurality of available RFID tags.

7. The method of claim 6, wherein the selective isolation and exposing of at least one RFID tag causes a predetermined control action initiated by the associated reader which is determined by the predetermined combination of the at least one RFID tag it reads, and modifying the at least one RFID tag that is isolated or exposed causes a different predetermined combination to be read to cause a different predetermined control action.

8. The method of claim 2, wherein the relative position of the at least one shielding system is changed by mechanical movement thereof.

9. The method of claim 8, wherein the mechanical movement of the at least one shielding system is caused by an actuator selected from the group consisting of a toggle switch, a rotary switch or combinations thereof.

10. The method of claim 1, further comprising providing at least one active RFID tag having a battery power supply, wherein the reading of the at least one active RFID tag is performed by selectively connecting or disconnecting the at least one active RFID tag from its associated battery source to selectively provide power to the at least one RFID tag where it then can be read by the associated reader.

11. The method of claim 1, further comprising the method of selectively covering or leaving exposed a portion of an antenna associated with the at least one RFID tag using a shielding material, whereby covering of the antenna portion causes the RFID tag to not be read by the associated reader, and leaving exposed that antenna portion causes the RFID tag to be read by the associated reader.

12. The method of claim 1, further comprising the method of selectively causing a short circuit in an antenna associated with the at least one RFID tag, whereby causing the short circuit causes the RFID tag to not be read by the associated reader, and opening the short circuit causes the RFID tag to be read by the associated reader.

13. The method of claim 1, further comprising the method of utilizing at least one signal connection to the at least one RFID tag'"'"'s integrated circuit, this signal connection also being referred to as a pin on the chip, or as an input pin, and optionally, an additional pin makes an internal circuit common node, also known as “

ground”

available external to the chip, further optionally several or all input pins have internal high impedance pull up resistors, or they may provide access to internal circuits so as to permit controlled modifications such as timing changes, these optional features, and other versions of them, being well known to those skilled in the art.

14. The method of claim 13, with the further intention of facilitating modification of the tag'"'"'s ID or modification of data that can be transponded by the tag.

15. The method of claim 14, wherein direct signal connection is achieved by connecting signal lines externally to the integrated circuit to at least one switch that is usable to implement a code onto the data the tag sends in response to the interrogation signal from the associated reader.

16. The method of claim 15 wherein several switches each have one terminal individually connected to one of several input pins, and the other terminals of each of the switches are together connected to one ground pin of the IC, in the parallel data transfer method well-known to those skilled in the art.

17. In further development of the method of claim 16, a number of switches greater than the number of available input pins can be implemented with proper addressing.

18. The method of claim 17, further comprising the method that each switch, or pushbutton, or key-switch, is the type that, when pressed, brings all of its electrical terminals into electrical contact with each other, and when released, leaves all of its terminals open.

19. The method of claim 18, further comprising the method of selecting a subset of the input pins for connection to each switch, this subset being unique to each switch.

20. The method of claim 19, further comprising the methods of:

a. connecting the ground pin to one of the terminals on each switch,

b. and connecting the subset of input pins as selected in accordance with claim 19 such that one input pin is connected individually to one of the switch'"'"'s terminals,

c. and each switch shall have a sufficient number of terminals to accommodate the ground and input pins assigned to it.

21. The method of claim 20, further comprising the method, for most switches, of making the number of input pins selected in accordance with claim 19 a fixed count, which count shall be symbolized by k.

22. Using the method of claim 21, in which:

a. the total number of input pins being utilized for the purpose described here is t,

b. and the number of pins in the subset uniquely selected for each of these switches is k,

c. the number of switches that can be addressed can be found from counting these combinations as C(t,k)=t!/(k!(t−

k)!).

23. The method of claim 21, further comprising the use of a matrix pattern addressing scheme, in which:

a. that fixed number, k, of input pins making up the subsets selected from those available, is the dimensionality of the matrix,

b. and all those t input pins available are then sub-divided into k groups, each individual signal pin in each group selects the address along that group'"'"'s dimension of the matrix.

24. The number of switches that can be addressed using the method of claim 23, in which the sub-divided groups of input pins number t₁, t₂, . . . t_k is given by the product of these group counts=t₁*t₂*t_k, and though typically smaller than C(t,k) as spelled out in claim 22, may in some cases be easier to implement, or have other advantages such as indicated in claim 28.

25. The method of claim 21 can be utilized to assist with detection and decoding of simultaneous or overlapping key presses, since whenever two or more keys are both pressed, the pattern of signal pins taken low is the bitwise AND of the pattern of signal pins taken low for either key, thus bringing more than k signal lines low, and each individual key has a unique pattern of a known number, k, of signal lines taken low.

26. The method of claim 25, further comprising, the realization that with each switch possessing a unique pattern of k signal lines it can take low, then any overlap of switch pressing can be detected and not confused with just being another key.

27. The method of claim 21, further comprising, as long as it is possible to detect one key being pressed ahead of another, then it in some cases is possible to decode which key needed to be ANDed in order to make up the overlap pattern.

28. The method of claim 23, further comprising, as long as it is possible to detect one key being pressed ahead of another, then it is always possible to decode which key needed to be ANDed in order to make up the overlap pattern by looking at the difference between the overlap pattern and the first pattern.

29. The method of claim 14, further comprising connecting any of a multiplicity of control or data sources into the tag'"'"'s IC and through that to the equipment under control, these data sources could be for example, a more typical keyboard.

30. The method of claim 1 offers opportunities to retain wireless connection between the point of control input and the equipment under control, while diminishing the electrical power needed at the control input, perhaps to the point where no battery is needed.

31. The method of claim 30 further comprising the placement of functions such as debouncing and decoding in either the point of control or the equipment being controlled.

32. The method of claim 1, further optionally comprising that the functionality of the associated reader, its interface and or the electrical apparatus under control include some or all of the following as is appropriate to any particular application;

a. non-volatile memory that contains, among other items, a list of the virtually connected points of control (tags),

b. factory-installed list of tag(s) that are or may possibly be virtually connected,

c. field-accessible points of access such as switches or buttons or contacts to enable appropriate additions to or deletions from the list,

d. one example implementation within the scope of this invention is to have a button on the reader labeled “

connect” and

the instructions to bring power to the reader and apparatus, bring the control selector into reader range, press the “

connect”

button while activating the control selector.