Design Of Low-Power Wireless Communication System Based On MSP430 Introduction:

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Daniel McCoy
5 years ago
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1 Design Of Low-Power Wireless Communication System Based On MSP430 Introduction: Low power wireless networks provide a new monitoring and control capability for civil and military applications in transportation, manufacturing, biomedical, environmental management, and safety and security systems. Wireless network nodes, operating at average and peak power levels constrained by compact power sources, offer a range of important challenges for low power methods. This system reports advances in low power systems spanning network design, through power management, low power mixed signal circuits, and highly integrated RF network inter faces. Particular attention is focused on methods for low power RF receiver systems.

REGULATOR HARDWARE REQUIREMENTS: SOFTWARE REQUIREMENTS: MSP 430, LCD, Relay Driver, Relays, Resistors, Capacitors, LEDs,

2 Block diagram: USER 1 BUFFER DRIVER RELAY OUTPUT DEVICES RF TRANSMITTER RF RECEIVER VOICE OR USER 2 M DC MOTOR OR RF TRANSMITTER RF RECEIVER VISUAL INDICATION MSP X 2 DISPLAY +12 Volts +5 Volts 230 V, AC TRANSFORMER RECTIFIER FILTER REGULATOR HARDWARE REQUIREMENTS: SOFTWARE REQUIREMENTS: MSP 430, LCD, Relay Driver, Relays, Resistors, Capacitors, LEDs, Crystal, Diodes, Transformer, Voltage Regulator, Push Button. Keil compiler uvision 4, Language: Embedded C or Assembly, WLPRO Programmer

3 Block diagram explanation: Power supply unit: This section needs two voltages viz., +12 V & +5 V, as working voltages. Hence specially designed power supply is constructed to get regulated power supplies. Keypad: A keypad is a set of buttons arranged in a block or "pad" which usually bear digits, symbols and usually a complete set of alphabetical letters. If it mostly contains numbers then it can also be called a numeric keypad. Keypads are found on many alphanumeric keyboards and on other devices such as calculators, push-button telephones, combination locks, and digital door locks, which require mainly numeric input. Buffers: Buffers do not affect the logical state of a digital signal (i.e. a logic 1 input results in a logic 1 output whereas logic 0 input results in a logic 0 output). Buffers are normally used to provide extra current drive at the output but can also be used to regularize the logic present at an interface. Drivers: This section is used to drive the relay where the output is complement of input which is applied to the drive but current will be amplified. Relays: It is an electromagnetic device which is used to drive the load connected across the relay and the o/p of relay can be connected to controller or load for further processing. Indicator: This stage provides visual indication of which relay is actuated and deactivated, by glowing respective LED or Buzzer.

4 MSP 430 Controllers: The MSP430 is a mixed-signal microcontroller family from Texas Instruments. Built around a 16- bit CPU, the MSP430 is designed for low cost and, specifically, low power consumption embedded applications. RF transmitter: This is 2-channel Radio Frequency Transmitter specially tuned with its RF Receiver part in carrier frequency. Each zone is set with one channel and transmits their presence to moving vehicle s RF Receiver unit. RF receiver: This is also a 2-channel RF Receiver specially tuned with its counterpart RF Transmitter in carrier frequency. When vehicle enters into any zone that zones RF signals are received by this unit. Thus depend upon the channel signals it receives from transmitting end that channel output of RF Receiver goes HIGH. This HIGH signal is fed to ARM7 chip through Buffer & Driver and Switching stage for further processing. Methodology: This system present that one RF TX will be used for user 1, another RF TX for user 2.Any user came. Then user should enter the password that is input to the MSP430, in controller it checks the password if patient is authorized then it process next. The MSP430 will generate the output that is fed to buffer IC 4050, buffer stores and given to the driver IC 2003 in driver current will amplifies and voltage will inverts with the help of Darlington circuit of driver IC to drive the relay. Then signal is given to the output load, and then load get turns ON.

5 Advantages: 1. Cost efficiency. 2. Integration. 3. Minimal losses. 4. Security of supply. Disadvantages: 1. The electricity network only (not gas) it concerns both distribution and transmission levels. Applications: 1. Mobile Telephones. 2. Wireless Data Communications. 3. Wireless Energy Transfer. 4. Wireless Medical Technologies. 5. Computer Interface Devices.

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