Transcript PPT
School of Electrical and Computer Engineering Wireless Telemetry for Solar Powered Car Heather Chang Farhan Farooqui William Mann November 1, 2010 Project Overview Wireless Data from the Solar Car to the Chase Car Design Features • Real-time display of vital information: – – – – – – – – Solar panels Voltage, Current, Power, Battery packs and Temperature Motor Vehicle speed Motor torque Motor controller status (on/off) Vehicle location (GPS) Outdoor and cabin ambient temperature • Wireless link with solar car (at least 100 ft) • GUI displaying data on LCD to driver and on laptop in chase car Design Overview Current Status • Established connection with the Single Board Computer • Ordered current (I) sensors, GPS, RF link and Hall effect sensors • In process of designing an alternate temperature sensor circuit Data Acquisition: Temperature Temperature sensors • Cabin Temperature • Outside Temperature Alternate Temperature Sensor The MAX6627 Temperature sensor: • Accuracy of ± 1°C in the 0°C to 125°C range • Operates in the -55°C to 125°C range • Uses a 3.3 to 5 V supply • Consumes 200 µA • Connects through SPI bus Data Acquisition: Vehicle Speed • Two Part System – Hall Effect RPM Sensor – Magnet Magnet attached to wheel Wheel RPM Sensor Data Acquisition: GPS • GPS Tracking –Linux driver –USB connectivity –Longitude, Latitude, Altitude, Speed –5 ft long wire Data Acquisition: Current (I) Sensor HASS 200-S Sensor: • Nominal current of 200 A (rms) • Measures up up to a range of ± 600 A • Low power consumption (5V, 22 mA) Current (I) Sensor Dimensions • Aperture: 20.4 x 10.4 ± 0.5 mm • Panel Mounting with M4 screws in mm. 20 mm = 0.787 in. RF Wireless Link ZigBee USB module: • Connects to both the SBC and the laptop via a USB port • Integrated 2.4GHz antenna • Range is up to 150 m • Consumes 147 mA in TX boost mode and 26 mA in Power Mode 03 • Compatible with Linux (MAC OS-9/-X, Windows 98SE/XP/2000) • AT Style command interface Jumper Board • Ribbon cable connection to SBC • Protection circuitry – Filters – Opto-isolators – Voltage regulators • Development – Proto board • Final – Soldered circuit board On-board Computer • Consumes 400 mA with a 5 V power supply • Programmable using embedded C on a Linux platform Connection Data Source SPI Bus Temp. Sensor A-D Converter Current Sensor USB GPS Receiver USB RF Wireless Link Digital I/O RPM sensor User Interface: Information Display Driver cabin Chase car • Low power LCD display • Stored in CSV (commaseparated values) Advantages / Disadvantages Advantages: • The Telemetry system is an independent system – Malfunction isolation – Comparison of measurements Disadvantages: • More components needed – Wires – Standalone SBC Project Schedule Nov 10, 2010 SBC sensing all sensors Nov 20, 2010 Laptop receiving data from the SBC Nov 27, 2010 GPS system integrated Dec 4, 2010 Graphical User Interface ready Future Work • Establish an interface among the ECE systems – Battery packs voltage/current/temperature measurements – Solar arrays voltage/current/temperature – Motor controller status • Physical connections to solar car • Develop useful user interface for Solar Jackets Questions?