tailieunhanh - McGraw-Hill- PDA Robotics - Using Your PDA to Control Your Robot 1 Part 5

Tham khảo tài liệu 'mcgraw-hill- pda robotics - using your pda to control your robot 1 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | PDA Robotics the microcontroller or the microprocessor is unable to drive the supply current required by the transceiver a low-cost SOT23 pnp transistor can be used to switch voltage on and off from the regulated power supply. The additional component cost is minimal and saves the system designer additional power supply costs. The 5-V regulator on the main board powers the transceiver in PDA Robot. The Microchip MCP2150 Plug and Play IrDA The MCP2150 is a cost-effective low pin-count 18-pin easy to use device for implementing IrDA standard wireless connectivity. The MCP2150 provides support for the IrDA standard protocol stack plus bit encoding decoding. The serial interface baud rates are user selectable to one of four IrDA standard baud rates between 9600 baud and kbaud 9600 19200 57600 115200 . The IR baud rates are user selectable to one of five IrDA standard baud rates between 9600 baud and kbaud 9600 19200 37400 57600 115200 . The serial interface baud rate will be specified by the BAUD1 BAUD0 pins while the IR baud rate is specified by the primary device during Discover phase . This means that the baud rates do not need to be the same. The MCP2150 operates in data terminal equipment DTE applications and sits between a UART and an IR optical transceiver. The MCP2150 encodes an asynchronous serial data stream converting each data bit to the corresponding IR formatted pulse. IR pulses received are decoded and then handled by the protocol handler state machine. The protocol handler sends the appropriate data bytes to the host controller in UART formatted serial data. The MCP2150 supports point-to-point applications that is one primary device and one secondary device. The MCP2150 operates as a secondary device. It does not support multipoint applications. Sending data using IR light requires some hardware and the use of specialized communication protocols. These protocol and hardware requirements are described in detail by the IrDA standard .