Wireless Telemetry System for Solar Vehicle

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School of Electrical and Computer Engineering. Wireless Telemetry System for Solar Vehicle. Scott Cowan Elliot Hernandez Tung Le March 14, 2011. Project Overview. Source: http://www.ece.gatech.edu/academic/courses/ece4007/10fall/ECE4007L01/ws1/files/sjt_final_presentation.ppt. - PowerPoint PPT Presentation

Transcript of Wireless Telemetry System for Solar Vehicle

Solar Jackets: Wireless Telemetry Senior Design Group

Wireless Telemetry System for Solar VehicleScott CowanElliot HernandezTung Le

March 14, 2011

School of Electrical and Computer Engineering1Project Overview

Source: http://www.ece.gatech.edu/academic/courses/ece4007/10fall/ECE4007L01/ws1/files/sjt_final_presentation.pptWhat is telemetry?

Why are we doing this project?

Throughout the solar car race, two escort vehicles accompany the one-man solar-powered vehicle to monitor its safety and performance. The Solar Jackets Telemetry System is an automatic, remote monitoring device that collects and transmits crucial instrumental data from low-power sensors and controllers inside the solar car to its chase car through a radio frequency (RF) transmission.

The Solar Jackets telemetry system allows a user to view and store real-time data from the solar powered car. The data will be viewable remotely through a computer program that will be installed on a laptop computer. The main purpose of this system is to provide the individuals in a chase car with real time data that will help monitor performance of the solar car.

2Prior Work from Fall 2010GPS receiverWi-Fi linkData storageData acquisitionVoltageCurrentTemperatureSpeed

Shortcomings of Fall 2010 DesignCurrent sensorsLow sensitivityUnipolar sensingSpeed sensorFragile designInterface boardProto-boardTransition ProblemsProgrammingSerial Peripheral Interface (SPI) bus not workingHardware dismantledAll sensors lostParts list incompletePart numbers missingSpring 2011 RemediesCurrent sensorsLower range = higher sensitivityBipolar = bidirectional sensingSpeed sensorIndustrial sensor = robustnessInterface boardPrinted circuit board (PCB) = permanence

Additional FeaturesTake advantage of SPI busEnclose PCB and SBC for protectionRead data from other subsystems on the RS-485 network

Current StatusCompleted tasksPreliminary schematic designComponent selectionLinux driver installationCross-compiler setupPresent tasksFinalizing schematic and PCB designsSoldering componentsCoding programAuto-sync Transmit data8Design Overview

Chase CarLaptopSolar CarSBCUSBCurrent




Battery Mgmt.Motor Ctrl.MPPTHMIData Storage




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Current MeasurementBi-polar Hall-effect sensor Sensing range: 140 AMaximum cable size: 1/2 OD10 available inputs

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Speed MeasurementIndustrial Hall-effect sensor Senses magnet attached to wheelSends pulse to SBCComputes t between pulses


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Temperature MeasurementDiode-connected transistor Two available inputs for remote sensorsOn-chip ADCAccuracy of 1 degree C

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Voltage MeasurementSimple voltage divider network Total of six 0-5 Vdc inputsThree remote signal conditioners for voltages up to 120 Vdc

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Interface BoardCustom PCBInterconnection between Inputs/Outputs (I/O) and SBC Signal bufferingAnalog to Digital conversions

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Single Board ComputerTS-7250Heart of telemetry systemLinux operating systemC language programming

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Vehicle LocationGlobalSat BU-353 GPS receiver NMEA 0183 protocolWaterproofFive foot USB cable

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Data from Other SubsystemsOther subsystems communicate on RS-485 network Telemetry listens through RS-485 to RS-232 converterRelevant data captured and storedRequested data sent to HMIBattery Mgmt.Motor Ctrl.MPPTHMIMade changes: font size, LCD to Driver


Data Storage2GB USB flash driveFAT16 file systemOne record set per secondCSV file format

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Data Transmission to Chase CarASUS WL-167g Wi-Fi transmitterIEEE 802.11g standardSupported by SBC driversRange of up to 150 m

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EnclosureLightweight ABS plasticApproximately 7 x 8 x 2.5 inches (W x L x H)IP 54 rating

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20General ChallengesSlow delivery of parts has delayed testingCurrent sensorsQSOP to DIP adaptersIdentification of major components has delayed SBC programmingTS-7250 SBC2 GB USB memory stickInterface Board ChallengesDesignSpark learning curveDesign and Library Creation tutorials helpfulPrinted Circuit Board size limitECE machine limited to 7 x 8 inch PCBsComponent specificationConnector selectionProgramming ChallengesTS-7250 SBC learning curveTyler Mann has assistedLinux compatible driversGPS, Wi-Fi, and memory devicesSerial Peripheral Interface (SPI) BusNeeds to work before PCB design is finalized

Future TestingSpeed sensorCurrent sensorsTemperature sensorsVoltage signal conditionersSPI busRS-485 to RS-232 converterCommunication to HMI

Project ScheduleMarch 23, 2011SBC sensing all sensorsMarch 30, 2011Wi-Fi transmission of dataApril 6, 2011Complete printed circuit boardApril 13, 2011Display data on remote laptopApril 20, 2011Final demonstration25Future Costs for Solar Jackets

Questions?27Wireless Data from the Solar Car to the Chase Car

Sheet1DescriptionQuantityUOIUnit PriceExtended CostCurrent sensors6ea$10.00$60.00Signal wiring1lot$100.00$100.00Misc connectors1lot$100.00$100.00Total$260.00