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Wireless Data Acquisition for SAE Car

Wireless Data Acquisition for SAE Car. Project by: J.P. Haberkorn & Jon Trainor Advised by: Mr. Steven Gutschlag. Presentation Outline. Project Overview Functional Description Hardware Description Wireless Transceivers Software Description Current Progress Future Work.

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Wireless Data Acquisition for SAE Car

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  1. Wireless Data Acquisition for SAE Car Project by: J.P. Haberkorn & Jon Trainor Advised by: Mr. Steven Gutschlag

  2. Presentation Outline • Project Overview • Functional Description • Hardware Description • Wireless Transceivers • Software Description • Current Progress • Future Work

  3. SAE Formula Car • Ongoing Senior Design Project at Bradley University • Needs a system that can track the car’s behavior in real time and record data for future analysis.

  4. Benefits of System • Accurate data logging • Stored in Excel Spreadsheet • Safer for car driver • Real time viewing

  5. Wireless Data System • Use the EMAC 80515 to interface with the sensors on the car. • Transmit the data wirelessly to a laptop computer and store it for further analysis. • Use the Aerocomm AC4790-20 Wireless Transceivers. • Update the laptop frequently to observe and record car behavior.

  6. Data to Acquire • Car Velocity • Acceleration Computation • Engine Speed • Engine Water Temperature • Oil Pressure • Suspension travel • Four Sensors

  7. Functional Description

  8. Aerocomm AC4790-200 • 900 MHz Transceivers • Range of about 1 mile. (4 miles with external antenna)

  9. Aerocomm AC4790-200 • Use RS232 Com Port 2 to communicate serially with Transceivers.

  10. Aerocomm AC4790-200 • Chips must be initialized to same settings. • Use AT Command Mode to Initialize AC4790. • AC4790 responds back to Host when issued a command.

  11. Aerocomm AC4790-200 • Initializing the AC4790 for Data Transmission

  12. Aerocomm AC4790-200 • AT Command Example Write Read

  13. Aerocomm AC4790-200

  14. Transmitting Data • 256 Byte Buffer • Set threshold on buffer for transmission initiation • Set RF Packet Size • Each hop takes 50ms

  15. Additional Hardware • One on-board EMAC 80515 Microcontroller Development Board to process sensor signals and transmit them through the RS232 Com Port 2. • One additional EMAC 80515 Microcontroller Development Board to test the receiving end of the system before interfacing the transceiver directly with a laptop.

  16. Equipment List • (2) EMAC 80515 Microcontroller Development Boards • (2) Aerocomm AC4790-20 Transceiver Chips • (2) MC1488 and MC1489 Drivers • Various Analog Components for Protection Circuitry • Function Generator • Digital Multi Meter • Oscilloscope • Laptop • High Current Power Supply (to run wheel sensor motor)

  17. Software Requirements • Utilize A/D Converter and interrupts to interpret the signals from the SAE car. • Use Com Port 2 to interface the transceiver with the EMAC board. • Update information as required by the Mechanical Engineers. • Different Priorities

  18. Updating Priority • Priority ONE • Car Velocity • Engine Speed • Suspension Travel • Lap Timer • Priority TWO • Engine Water Temperature • Oil Pressure

  19. Transmitting Flow Chart

  20. Receiving • Used EMAC board to receive data from the transceiver. • Ideally, the transceiver will be directly connected to a laptop through the RS232 port. • MATLAB can provide this functionality. • Program would store data in some usable form (i.e. Spreadsheet, notepad file) • Program would display critical information on laptop screen and update as new information is received.

  21. Current Progress • Completed task of getting two EMAC boards to communicate with each other via RS-232 ports. • Sine wave applied to A/D converter and transmitted out through COM2 port. • Second EMAC board receives converted signal and sends it back to the first EMAC board. • When the signal is received by the first EMAC, the transmission is sent out through the D/A converter and compared with the input signal on an oscilloscope.

  22. Current Progress

  23. Current Progress • Established serial communication with AC4790 Transceivers. • AT Command Mode mastered. • Successfully initialized both transceivers.

  24. Current Progress • Wirelessly transmitted and received data. • Successfully sent and received 40 continuous bytes of data in one packet. • No errors in data

  25. Current Progress • Attempted to send continuous streaming data • 100Hz Sine Wave • Buffer filling up • Data loss occurring

  26. Current Progress • Simulated car signals on transmitting end. • Processed signals and sent out in a packet. • Updated every 0.5s

  27. Future Work • Implement MATLAB Software to display data in real time on off-track computer. • We already have program information • Testing with actual car sensors • Design and build casing for inside the SAE Formula Car • Install hardware on formula car

  28. Questions?

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