Method And System For Visible Light Obstruction

Field of the Invention: The present invention relates to the field of visible light communication, and in particular to a method and a device for controlling at least one parameter at a controlled device based on visible light obstruction. Background of the Invention: Conventionally, wireless remote control devices (hereinafter also simply called “remote control devices”) for remotely controlling electronic devices. In these remote control devices, infrared rays or the like is widely used as a medium through which to transmit operational information to the electronic devices. In such devices, the remote control device is provided one or more control buttons for receiving user input, a control circuit is provided to generate a control signal based on the user input and a transmitter unit is provided for transmitting the control signal. Apart from the above, remote control devices comprising touch screen devices are also available. In such devices one or more icons are displayed on a touch sensitive screen. A processor is operably connected to the touch sensitive screen for sensing a touch corresponding to said at least one icon and produce a control signal and a transmitter unit is provided for transmitting the control signal. Apart from the above, visible light communication technology which relies upon use of light rays which are visible to human naked eyes are used for controlling particularly for switching ON or OFF of electronic devices. However, remote control device based on visible light communication technology have not been explored to a large extent and presents a lot of scope as visible light control systems have several advantages in that the visible light energy is generally, readily available. Production of visible light (in environments where it is not available) is inexpensive. In addition, since visible light includes a plurality of distinct colors, the use of visible light control systems permits the implementation of multiple control functions which are color selective. Objects of the Invention: Thus, it is an object of the present invention to provide a controlling method for controlling at least one parameter at a controlled entity based on visible light obstruction. 3 It is a further object of the present invention to provide a controlling device for controlling at least one parameter at a controlled entity based on visible light obstruction. Summary of the Invention: Thus, the present invention provides a controlling method comprising detecting, at a controlling entity, obstruction in visible light received by a visible light receiver array comprising plurality of photo detectors. The control entity determines an amount of obstruction or an amount of non-obstruction, and generates a control signal corresponding to the same. A transmitter unit provided with the control entity then sends the control signal thus generated to a controlled entity. In accordance with an aspect of the invention, a mapping is provided between the controlling entity and the controlled entity such that a control signal generated by the controlling entity is able to control at least one parameter at the controlled entity. Implementing the method described above, a controlling device is provided comprising a visible light receiver array comprising plurality of photo detectors. The visible light receiver array is provided such that it receives visible light. A detection element is provided in operational interconnection with the visible light receiver array for detecting obstruction in visible light received by the visible light receiver array. A determining element is further provided so as to be in operational interconnection with the detection element for determining an amount of obstruction or an amount of non-obstruction. The controlling device is further provided with a control signal generating element for generating a control signal based on the amount of obstruction or the amount of non-obstruction. Further, a transmitting element is provided for providing the control signal to the controlled entity. To further clarify advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended figures. It is appreciated that these figures depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying figures. Brief Description of Figures: These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the 4 accompanying figures in which like characters represent like parts throughout the figures, wherein: Figure 1 illustrates flow chart of a controlling method in accordance with an embodiment of the present invention; Figure 2 illustrates a block diagram of a controlling device in accordance with an embodiment of the present invention; Figure 3 illustrates a schematic diagram of a network implementing the method of controlling allocation of bandwidth available with a bandwidth providing device in accordance with one embodiment of the present invention; Figure 4 illustrates a schematic diagram of controlling the obstruction in respect of the controlling device in accordance with one embodiment of the present invention; Figure 5 illustrates an obstruction map as generated for the example shown in figure 4; Figure 6 illustrates an outcome of the aforesaid method which results in reserving certain amount of bandwidth in respect of a first bandwidth receiving device as per the example shown in figure 4; Figure 7 illustrates a method for adjusting the threshold value in accordance with an embodiment of the present invention; Figure 8 illustrates a schematic diagram of controlling the obstruction in respect of the controlling device in accordance with yet another embodiment of the present invention; Figure 9 illustrates an obstruction map as generated for the example shown in figure 8; and Figure 10 illustrates a schematic diagram of controlling the obstruction in respect of the controlling device in accordance with yet another embodiment of the present invention such that bandwidths for three bandwidth receiving devices can be controlled. Further, skilled artisans will appreciate that elements in the figures are illustrated for simplicity and may not have been necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present invention. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the figures by conventional symbols, and the figures may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the figures with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein. 5 Detailed Description: For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the figures and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates. It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof. Reference throughout this specification to “an aspect”, “another aspect” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrase “in an embodiment”, “in another embodiment” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment. The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps but may include other steps not expressly listed or inherent to such process or method. Similarly, one or more devices or sub-systems or elements or structures or components proceeded by "comprises... a" does not, without more constraints, preclude the existence of other devices or other sub-systems or other elements or other structures or other components or additional devices or additional sub-systems or additional elements or additional structures or additional components. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting. 6 Embodiments of the present invention will be described below in detail with reference to the accompanying figures. Now referring to figure 1, there is illustrated a controlling method (100) for controlling an entity (hereinafter controlled entity), said method comprising: detecting (101), at a controlling entity, obstruction in visible light received by a visible light receiver array, said visible light receiver array comprising plurality of photo detectors; determining (102), by the controlling entity, an amount of obstruction or an amount of nonobstruction; generating (103), by the controlling entity, a control signal based on the amount of obstruction or the amount of non-obstruction; and providing (104), by the controlling entity, the control signal to a controlled entity. Preferably, the aforesaid method can be adopted for controlling at least one parameter at the controlled entity. In a preferred aspect of the invention, detecting obstruction in visible light can be performed by detecting (105) a change in an amount of current produced by the visible light receiver array. In a preferred aspect of the invention, determining an amount of obstruction can be performed in any one of the following mechanisms:  determining a number of photo detectors producing electricity below a threshold value (106);  preparing an obstruction map of the visible light receiver array and generating an approximate percentage of obstruction based on the obstruction map (108); or  preparing an obstruction map of the visible light receiver array and generating an approximate ratio of obstruction to non-obstruction based on the obstruction map (110). In a preferred aspect of the invention, determining an amount of non-obstruction can be performed in any one of the following mechanisms:  determining a number of photo detectors producing electricity above a threshold value (107); 7  preparing an obstruction map of the visible light receiver array and generating an approximate percentage of non-obstruction based on the obstruction map (109); or  preparing an obstruction map of the visible light receiver array and generating an approximate ratio of non-obstruction to obstruction based on obstruction map. In a preferred aspect of the invention, the process of obstruction map of the visible light receiver array comprises: detecting the photo detectors producing electricity above a threshold value; and detecting the photo detectors producing electricity below the threshold value. In a preferred aspect of the invention, the threshold value of current as is required to be produced by a photo detector (or a group of photo detectors) can be varied by varying sensitivity of the photo detectors for light detection. The control signal can thus be based on:  an approximate ratio of obstruction to non-obstruction;  an approximate ratio of non-obstruction to obstruction;  an approximate percentage of obstruction; or  an approximate percentage of non-obstruction. In a preferred aspect of the invention, the control signal is an electronic representation of a value between 0 to 100%. Now referring to figure 2, there is provided a controlling device (200) comprising: a visible light receiver array (201) comprising plurality of photo detectors; a detection element (202) being in operational interconnection with the visible light receiver array for detecting obstruction in visible light received by the visible light receiver array; a determining element (203) being in operational interconnection with the detection element for determining an amount of obstruction or an amount of non-obstruction; a control signal generating element (204) being in operational interconnection with the determining element for generating a control signal based on the amount of obstruction or the amount of non-obstruction; and a transmitting element (205) being in operational interconnection with the control signal generating element and a controlled entity for providing the control signal to the controlled entity. 8 Without wanting to be limited to the particular aspect, the method of the present invention can be applied for controlling allocation of available bandwidth in a network comprising a bandwidth providing device and a first bandwidth receiving device. In such a case, the method the first bandwidth receiving device can be configured to produce a control signal that will function as a request for allocation of bandwidth to the first device. Thus, in the aforesaid scenario, the method can be said to comprise of:  detecting, at the first bandwidth receiving device, obstruction in visible light received by a visible light receiver array, said visible light receiver array comprising plurality of photo detectors;  determining, by the first bandwidth receiving device, an amount of obstruction or an amount of non-obstruction;  generating, by the first bandwidth receiving device, a bandwidth allocation signal based on the amount of obstruction or the amount of non-obstruction; and  providing, by the first bandwidth receiving device, the bandwidth allocation signal to a bandwidth providing device for controlling allocation of available bandwidth. Considering the above mentioned preferred aspect the controlling device can be in the form of a bandwidth receiving device and can comprise: a visible light receiver array comprising plurality of photo detectors; a detection element being in operational interconnection with the visible light receiver array for detecting obstruction in visible light received by the visible light receiver array; a determining element being in operational interconnection with the detection element for determining an amount of obstruction or an amount of non-obstruction; a control signal generating element being in operational interconnection with the determining element for generating a bandwidth allocation signal based on the amount of obstruction or the amount of non-obstruction; and a transmitting element being in operational interconnection with the control signal generating element and a bandwidth providing device for providing the bandwidth allocation signal to the bandwidth providing device. In case the network comprises at least one further bandwidth receiving device and wherein bandwidth allocation signal is for controlling allocation of the available bandwidth to the first 9 bandwidth receiving device, the same can also function to define the control signal for bandwidth allocation to such further bandwidth requiring device(s). By way of a non-limiting example, in case control signal is an electronic representation of a value between 0 to 100% and if the control signal acts as a request for allocation of bandwidth to the first device, a remaining value, which can be calculated as Available bandwidth – Allocated bandwidth, can be allocated to one or more further devices that form part of the network. In addition to the above, each of the first bandwidth receiving device and said at least one further bandwidth receiving device can be allocated priority value. In a preferred aspect, the bandwidth allocation signal for controlling allocation of the available bandwidth to said first bandwidth receiving device and said at least one further bandwidth receiving device is in accordance with allocated priority. In the following paragraphs, the functioning of the method for the purposes of allocation of bandwidth available with a bandwidth providing device that forms part of a network is illustrated. Now referring to figure 3, there is illustrated a network (300) which comprises a bandwidth providing device (301), a first bandwidth receiving device (302) and a second bandwidth receiving device (303). A first user operating the first bandwidth receiving device is interested in reserving at the bandwidth providing device certain amount of available bandwidth. Thus, as illustrated by action 1a, the user obstructs visible light received by a visible light receiver array forming part of the first bandwidth receiving device. The first bandwidth receiving device determines an amount of obstruction or an amount of nonobstruction (as illustrated in actions 1b and 1d) and generates a control signal. The first bandwidth receiving device can adopt any of the method as illustrated and described with respect to figure 1 for the aforesaid purpose. Additionally, the user at the first bandwidth receiving device can adjust threshold value of current which is taken into consideration while determining an amount of obstruction (as illustrated in action 1c). The control signal is sent to the bandwidth providing device as illustrated by action 2 to enable the bandwidth providing device to internally reserve resources as per the control signal (as illustrated by action 3) and finally, allocate the requested bandwidth to the first bandwidth receiving device (as illustrated 10 by action 4a). The bandwidth providing device may further allocate a remaining part of the available bandwidth to the second bandwidth requesting device (303) (as illustrated by action 4b). Referring to figure 4, illustrates a first mechanism for controlling the obstruction in respect of the controlling device in accordance with one embodiment of the present invention. In the embodiment, the obstruction is based on the area of photo detector which is not able to receive the light (or receives less amount of light). As further illustrated in figure 4, in order to provide assistance to user to determining the amount of obstruction, a real time visual indicator (401) for indicating an amount of obstruction can be displayed on a display device associated with the first bandwidth receiving device. While in figure 4 the visual indicator is shown as a graduated scale, other forms can be adopted. As mentioned above, the first bandwidth receiving device can determine an amount of obstruction using any of a plurality of methods. Especially, it has been found that for the purposes of determining an amount of obstruction, a route involving preparing an obstruction map can be beneficial. In particular, the method can involve preparing an obstruction map of the visible light receiver array and generating an approximate percentage of obstruction based on the obstruction map. In an alternative, the method can involve preparing an obstruction map of the visible light receiver array and generating an approximate ratio of obstruction to non-obstruction based on the obstruction map. In this regard, figure 5, illustrates a sample obstruction map (500) as may be prepared which shows the photo detectors that are obstructed by “X” (501) and shown the photo detectors that are non-obstructed as “O” (502). Once the bandwidth providing device allocates the requested bandwidth to the first bandwidth receiving device, as illustrated in figure 6, an indication (601) to the extent is displayed on a display device associated with the first bandwidth receiving device. Now referring to figure 7, reference numeral 700 illustrates an action taken by the first user to adjust sensitivity of the photo detectors. The aforesaid action results in adjusting of the threshold current level which is taken into consideration for categorizing a particular photo detector as producing current or as NOT producing current. In this regard, it must be noted that it is not essential that the amount of current produced by a photo detector which is obstructed is zero. It is also not essential that two photo detectors which are obstructed will produce same amount of current (or for that matter two photo detectors which are non11 obstructed will produce same amount of current). Thus, current level can be set at a pre-set value and the user can at any point of time, change the threshold value to suit the amount of light received by the visible light receiver array. The impact of the user adjusting the sensitivity is illustrated in graph 701, which shows the amount of current produced by photodiode-1 (702), photodiode-2 (703), photodiode-3 (704) and photodiode-4 (705) over a period of time. It can be seen that since the amount of current produced by photodiode-1 (702) and photodiode-2 (703) is above the threshold value (706), the same are taken as light receiving photo diodes. On the other hand, the amount of current produced by photodiode-3 (704) and photodiode-4 (705) is below the threshold value (706), the same are taken as light obstructed photo diodes. In some instances, it may be felt that the first mechanism for controlling obstruction (as illustrated in figure 4 and described above) may not be user friendly and in such case, an alternative method for controlling obstruction, as illustrated in figure 8 can be followed. In the alternative mechanism, the user can after creating an obstruction, move the same in a particular direction to increase or decrease the amount of obstruction. Particularly, as shown in figure 8 (which shows a human hand as an object that creates the obstruction), the hand is dragged (801) in a direction so as to increase or decrease the amount of obstruction. Similar to that figure 4, the real time visual indicator (802) indicates the amount of obstruction (as interpreted by the determining element (203) that determines the amount of obstruction). A sample obstruction map (900) as may be prepared for the scenario depicted in figure 8 is illustrated in figure 9, which shows the photo detectors that are obstructed by “X” (901) and shown the photo detectors that are non-obstructed as “O” (902). While figure 3 illustrated the working of the invention in a network comprising two bandwidth receiving devices, there can be instances where the number of bandwidth receiving devices can be more than 2 and it is required to allocate the bandwidth to such multiple deices. Now referring to figure 10, there is illustrated a method for simultaneously allocating bandwidth to 3 connected devices (Device A, Device B and Device C). As illustrated in figure 10, an obstruction of certain amount of area is created such that it is offset from a right-side corner of the visible light receiver array and offset from left-side corner of the visible light receiver array. In this case, the number of light receiving photo diodes starting from the left-side corner to the beginning of the light obstructed photo diodes is calculated (or obtained from the obstruction map) and a control signal on the basis of the 12 same is generated and is allocated to Device A. The control signal corresponding to Device B is generated on the basis of the number of light obstructed photo diodes. The control signal corresponding to Device C is generated on basis of number of light receiving photo diodes starting from the end of the light obstructed photo diodes to the right-side corner of the visible light receiver array. By way of a non-limiting example, in case if there are four connected devices whose bandwidth allocation is to be controlled, the same can still be done simultaneously, for example by creating two obstructions that spaced away from each other. For example, a hand obstruction in the form of “V” shaped can be formed such that it is offset from both the rightside corner and the left side corner of the visible light receiver array and the mechanism as described with reference to figure 10 can be adopted for generating control signals for controlling allocation to the four connected devices. There can be instances, wherein a network comprising three or more devices, a control signal for allocation of bandwidth to a particular device is received. In such a case, the device from which the control signal is received can be treated as ADMIN device and the bandwidth requested can be allocated or reserved for the ADMIN deice. In such a scenario, the remaining bandwidth can be then made available to the two or remaining devices and allocation of bandwidth between these two or more devices can be made, for example, based on priority allocated to such two or more devices or any other technique for bandwidth sharing. While specific language has been used to describe the disclosure, any limitations arising on account of the same are not intended. As would be apparent to a person in the art, various working modifications may be made to the method in order to implement the inventive concept as taught herein. The figures and the forgoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. For example, orders of processes described herein may be changed and are not limited to the manner described herein. Moreover, the actions of any flow diagram need not be implemented in the order shown; nor do all of the acts necessarily need to be performed. 13 Also, those acts that are not dependent on other acts may be performed in parallel with the other acts. The scope of embodiments is by no means limited by these specific examples. Numerous variations, whether explicitly given in the specification or not, such as differences in structure, dimension, and use of material, are possible. The scope of embodiments is at least as broad as given by the following claims. 14 We Claim: 1. A controlling method comprising: detecting, at a controlling entity, obstruction in visible light received by a visible light receiver array, said visible light receiver array comprising plurality of photo detectors; determining, by the controlling entity, an amount of obstruction or an amount of nonobstruction; generating, by the controlling entity, a control signal based on the amount of obstruction or the amount of non-obstruction; and providing, by the controlling entity, the control signal to a controlled entity. 2. The method as claimed in claim 1, wherein detecting obstruction in visible light comprises detecting a change in an amount of current produced by the visible light receiver array. 3. The method as claimed in claim 1, wherein determining an amount of obstruction comprises determining a number of photo detectors producing electricity below a threshold value. 4. The method as claimed in claim 4, wherein the threshold value can be varied by varying sensitivity of the photo detectors for light detection. 5. The method as claimed in claim 1, wherein determining an amount of non-obstruction comprises determining a number of photo detectors producing electricity above a threshold value. 6. The method as claimed in claim 1, wherein determining an amount of obstruction comprises preparing an obstruction map of the visible light receiver array and generating an approximate percentage of obstruction based on the obstruction map. 7. The method as claimed in claim 1, wherein determining an amount of non-obstruction comprises preparing an obstruction map of the visible light receiver array and generating an approximate percentage of non-obstruction based on the obstruction map. 15 8. The method as claimed in claim 1, wherein determining an amount of obstruction comprises: preparing an obstruction map of the visible light receiver array; and generating an approximate ratio of obstruction to non-obstruction based on the obstruction map. 9. The method as claimed in claim 1, wherein determining an amount of non-obstruction comprises: preparing an obstruction map of the visible light receiver array; and generating an approximate ratio of non-obstruction to obstruction based on obstruction map. 10. The method as claimed in any of claims 6 to 9, wherein preparing obstruction map of the visible light receiver array comprises: detecting the photo detectors producing electricity above a threshold value; and detecting the photo detectors producing electricity below the threshold value; 11. The method as claimed in claim 1, wherein the control signal is based on an approximate ratio of obstruction to non-obstruction. 12. The method as claimed in claim 1, wherein the control signal is based on an approximate ratio of non-obstruction to obstruction. 13. The method as claimed in claim 1, wherein the control signal is based on an approximate percentage of obstruction. 14. The method as claimed in claim 1, wherein the control signal is based on an approximate percentage of non-obstruction. 15. The method as claimed in any of claims 13 or 14, wherein the control signal is an electronic representation of a value between 0 to 100%. 16. A method of controlling allocation of available bandwidth in a network comprising a bandwidth providing device and a first bandwidth receiving device, comprising: 16 detecting, at the first bandwidth receiving device, obstruction in visible light received by a visible light receiver array, said visible light receiver array comprising plurality of photo detectors; determining, by the first bandwidth receiving device, an amount of obstruction or an amount of non-obstruction; generating, by the first bandwidth receiving device, a bandwidth allocation signal based on the amount of obstruction or the amount of non-obstruction; and providing, by the first bandwidth receiving device, the bandwidth allocation signal to a bandwidth providing device for controlling allocation of available bandwidth. 17. The method as claimed in claim 16, wherein detecting obstruction in visible light comprises detecting a change in an amount of current produced by the visible light receiver array. 18. The method as claimed in claim 16, wherein determining an amount of obstruction comprises determining a number of photo detectors producing electricity below a threshold value. 19. The method as claimed in claim 16, wherein determining an amount of nonobstruction comprises determining a number of photo detectors producing electricity above a threshold value. 20. The method as claimed in claim 16, wherein determining an amount of obstruction comprises preparing an obstruction map of the visible light receiver array and generating an approximate percentage of obstruction based on obstruction map. 21. The method as claimed in claim 16, wherein determining an amount of nonobstruction comprises preparing an obstruction map of the visible light receiver array and generating an approximate percentage of non-obstruction based on obstruction map. 22. The method as claimed in claim 16, wherein determining an amount of obstruction comprises preparing an obstruction map of the visible light receiver array and generating an approximate ratio of obstruction to non-obstruction based on obstruction map. 17 23. The method as claimed in claim 16, wherein determining an amount of nonobstruction comprises preparing an obstruction map of the visible light receiver array and generating an approximate ratio of non-obstruction to obstruction based on obstruction map. 24. The method as claimed in any of claims 20 to 23, wherein preparing obstruction map of the visible light receiver array comprises: detecting the photo detectors producing electricity above a threshold value; and detecting the photo detectors producing electricity below the threshold value; 25. The method as claimed in claim 16, wherein the bandwidth allocation signal is based on an approximate ratio of obstruction to non-obstruction. 26. The method as claimed in claim 16, wherein the bandwidth allocation signal is based on an approximate ratio of non-obstruction to obstruction. 27. The method as claimed in claim 16, wherein the bandwidth allocation signal is based on an approximate percentage of obstruction. 28. The method as claimed in claim 16, wherein the bandwidth allocation signal is based on an approximate percentage of non-obstruction. 29. The method as claimed in any of claims 27 or 28, wherein the bandwidth allocation signal is an electronic representation of a value between 0 to 100% corresponding to the bandwidth allocation to the first bandwidth receiving device. 30. The method as claimed in claim 16, wherein bandwidth allocation signal is for controlling allocation of the available bandwidth to the first bandwidth receiving device. 31. The method as claimed in claim 16, wherein the network further comprises at least one further bandwidth receiving device and wherein bandwidth allocation signal is for controlling allocation of the available bandwidth to said at least one further bandwidth receiving device. 32. The method as claimed in claim 16, wherein the network further comprises at least one further bandwidth receiving device and wherein bandwidth allocation signal is for 18 controlling allocation of the available bandwidth to said first bandwidth receiving device and said at least one further bandwidth receiving device are allocated priority value. 33. The method as claimed in claim 32, wherein bandwidth allocation signal for controlling allocation of the available bandwidth to said first bandwidth receiving device and said at least one further bandwidth receiving device is in accordance with allocated priority. 34. A method of controlling at least one parameter, said method comprising: detecting an obstruction in visible light received by a visible light receiver array, said visible light receiver array comprising plurality of photo detectors; determining an amount of obstruction or an amount of non-obstruction; generating a control signal based on the amount of obstruction or the amount of nonobstruction; and providing the control signal so as to control at least one parameter. 35. A controlling device comprising: a visible light receiver array comprising plurality of photo detectors; a detection element being in operational interconnection with the visible light receiver array for detecting obstruction in visible light received by the visible light receiver array; a determining element being in operational interconnection with the detection element for determining an amount of obstruction or an amount of non-obstruction; a control signal generating element being in operational interconnection with the determining element for generating a control signal based on the amount of obstruction or the amount of non-obstruction; and a transmitting element being in operational interconnection with the control signal generating element and a controlled entity for providing the control signal to the controlled entity. 36. A bandwidth receiving device comprising: a visible light receiver array comprising plurality of photo detectors; 19 a detection element being in operational interconnection with the visible light receiver array for detecting obstruction in visible light received by the visible light receiver array; a determining element being in operational interconnection with the detection element for determining an amount of obstruction or an amount of non-obstruction; a control signal generating element being in operational interconnection with the determining element for generating a bandwidth allocation signal based on the amount of obstruction or the amount of non-obstruction; and a transmitting element being in operational interconnection with the control signal generating element and a bandwidth providing device for providing the bandwidth allocation signal to the bandwidth providing device.