SOLAR PV CONTROL SYSTEM.pdf

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(PAN). The PAN is identified by a 16-bit PAN Identifier and one of its coordinators is designed as a PAN coordinator. A coordinator handles among others the following task: • It manages a list of associated devices. Devices are required to explicitly associate and disassociate with a coordinator using certain signalling packets. • It allocates short addresses to it devices. All IEEE 802.15.4 nodes have a 64- bit device address. When a device associates with a coordinator, it may request assignment of a 16-bit short address to be subsequently in all communications between device and coordinator. The assigned address is included in the association response packet issued by the coordinator. • In the beaconed mode of IEEE 802.15.4, it transmits regularly frame beacon packets announcing the PAN identifier, a list of outstanding frames, and other parameters. Furthermore, the coordinator can accept and process requests to reserve fixed time slots to nodes and the allocation are indicated in the beacon. • It exchanges data packets with devices and with peer coordinators. Basic operation The main focus of IEEE 802.15.4 protocol is its ability to deliver low power consumption and low-rate wireless communication devices. The following numbers of channels can be used in IEEE 802.15.4, which is 16 channels for ISM 2.4GHz, 10 channels for ISM 900 MHz and 1 channel for 868 MHz The PHY-layer used in IEEE 802.15.4 provides Link Quality Indicator (LQI) for the communication that occurs between transmitter and receiver in order to maintain good quality of signals transmitted between nodes. The MAC layer which is utilized in IEEE 802.15.4 for communication is based on Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism to get admission of the channels. Devices that are supported by IEEE 802.15.4 are Full Function Device (FFD) and Reduced Function Device (RFD). A device which is constructed as FFD can be used for both FFD and RFD in Email: david.irungu@stu.kuct.ac.ke 45 2012
communication. FFD can also be set as PAN Coordinator, Router or End Device, while RFD is only suitable as End Device. Communication for RFD can only occur with FFD. An overview of how the protocol stack is defined for IEEE 802.15.4 is shown in the figure below. There are two types of communication mode process available in IEEE 802.15.4 for avoiding interference in an environment where several system are running on the same frequency band. The modes which help to reduce the disturbance are beacon mode and non-beacon mode. Email: david.irungu@stu.kuct.ac.ke Figure 15: IEEE 802.15.4 protocol stack The beacon mode is used with Star-type networks that are configured with the network management node, referred to also as the “PAN coordinator”, at the core. The PAN coordinator sends off a beacon signal at fixed intervals, while other nodes synchronize with this beacon signal and perform communications during allotted periods. Since only the node that has been singularly assigned by the coordinator gains exclusive use of the channel, it becomes possible to conduct communications in which no collisions can occur. This mode, therefore, is used for communications 46 2012
Page 1 and 2: Solar PV Control System using an Ar
Page 3 and 4: Acknowledgement I must acknowledge
Page 5 and 6: Contents Declaration ..............
Page 7 and 8: Figure 21: Block Diagram ..........
Page 9 and 10: CHAPTER 1 Introduction The Solar PV
Page 11 and 12: panel. This increases the amount of
Page 13 and 14: CHAPTER 2 LITERATURE REVIEW Renewab
Page 15 and 16: Since the Max Peak Power Point (MPP
Page 17 and 18: 3. Simple circuitry is desired. A v
Page 19 and 20: SERVO MOTORS Servos are DC motors w
Page 21 and 22: STEPPER MOTORS A stepper motor is a
Page 23 and 24: Motor Sizing To size an electric mo
Page 25 and 26: SENSORS LED as light sensor Figure
Page 27 and 28: Photocells Photocells are sensors t
Page 29 and 30: Main functions Include PWM (Pulse
Page 31 and 32: Applications Street Lighting Path
Page 33 and 34: D. COMMUNICATION Wireless technolog
Page 35 and 36: 802.11a has fast maximum speed; reg
Page 37 and 38: Advantage and disadvantage Wireless
Page 39 and 40: transmission. The latest version of
Page 41 and 42: is a hard challenge since considera
Page 43 and 44: When we use these two technologies
Page 45: total number of 27 channels, where
Page 49 and 50: Power management The main focus for
Page 51 and 52: Figure 20: Reference Pin out (Xbee)
Page 53 and 54: CHAPTER 3 Methodology of Implementa
Page 55 and 56: Block Diagram of Improved solar tra
Page 57 and 58: Street Light Implementation Increas
Page 59 and 60: Figure 23: LM35, LCD connections to
Page 61 and 62: Thus basically the figure shown bel
Page 63 and 64: Figure 28: HyperTerminal Figure 29:
Page 65 and 66: Conclusion: - Possible Errors 1. Sy
Page 67 and 68: APPENDIX: Plan of Action Table 4: P
Page 69 and 70: int LED1=40; // Digitalpin int LED2
Page 71: delay (5000); digitalWrite (swpin10

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