ECE 477 Design Review Team 01  Fall 2010 Jigar Gandhi Chandler Wall John-Taylor Smith Eric Zarowny

Outline Project overviewProject overview Project-specific success criteriaProject-specific success criteria Block diagramBlock diagram Component selection rationaleComponent selection rationale Packaging designPackaging design Schematic and theory of operationSchematic and theory of operation PCB layoutPCB layout Software design/development statusSoftware design/development status Project completion timelineProject completion timeline Questions / discussionQuestions / discussion

Project Overview Our project is an unmanned, autonomous flying aircraft.Our project is an unmanned, autonomous flying aircraft. The aircraft will be able to transmit image, telemetry, and battery data to a ground station.The aircraft will be able to transmit image, telemetry, and battery data to a ground station. The ground station will overlay the telemetry and battery data onto the image data to create a “digital cockpit”.The ground station will overlay the telemetry and battery data onto the image data to create a “digital cockpit”.

Project-Specific Success Criteria 1.An ability to overlay telemetry and battery data onto image data in real-time using the ground station. 2.An ability to transmit real-time telemetry, image and battery data from the aircraft to the ground station using wireless modules. 3.An ability to store encoded image data on a flash memory module interfaced with the micro controller for later viewing. 4.An ability to upload GPS coordinates from the ground station to the aircraft. 5.An ability to monitor battery status and enter into a power save mode that halts image capture and transmission in order to preserve remaining battery life for flight operation.

Block Diagram

Component Selection Rationale PIC32MX795F512HPIC32MX795F512H –64 pins –80 MHz max frequency –512K flash, 128K SRAM –Internal 8 MHz and 32 kHz oscillators –UART, I2C, SPI, PWM functionality to handle all of the peripheralsfunctionality to handle all of the peripherals Battery management system (DS2788)Battery management system (DS2788) –Handles up to 10 cells in series –Simplicity in external circuit design

Component Selection Rationale XBee PROXBee PRO –provides 2.4 GHz wireless transmission channel –capable of transferring camera and GPS data –1 mile range –speeds up to 250 kb/s CMOS JPEG CameraCMOS JPEG Camera –performs JPEG compression on the chip –will provide 15 fps SD CardSD Card –High speed data rates –Portable, simplistic implementation

Packaging Design Dimensions of the AirbusDimensions of the Airbus –Wingspan: 4’10” –Fuselage: 3’L x 5.5”W x 5”H Dimensions of the Internal HullDimensions of the Internal Hull –1’8”L x 3.5”W x 3”H MaterialsMaterials –Rigid foam design Mounting PCB and battery in planeMounting PCB and battery in plane Will have to balance weight distributionWill have to balance weight distribution

Schematic/Theory of Operation Lithium polymer batteryLithium polymer battery –11.1 volts –2200 mAh –1 switch mode DC-DC voltage regulators –2 LDO voltage regulators CMOS cameraCMOS camera –1.6V & 2.8V –I2C interface –JPEG compression –15 fps –Micro is master and camera is slave –External clock and 20 MHz frequency provided by micro

Schematic/Theory of Operation XBee ProXBee Pro –Wireless communication with ground station –Connected to micro with CMOS UART –Baud rates set to transfer data at 250 kb/s AutopilotAutopilot –Send telemetry data to micro –Receive GPS coordinates from micro

Schematic/Theory of Operation SD CardSD Card –store video data –SD bus mode allows for 12 Mb/s transfer Coulomb counterCoulomb counter –ability to monitor three lithium polymer cells in series –bidirectional open-drain serial port provides communication to micro –Electrical isolation circuit to protect micro

Schematic/Theory of Operation

Schematic - Camera

Schematic – Power Mgmt

Schematic - Microcontroller

PCB Layout - Camera

PCB Layout – Power Mgmt

PCB Layout – Micro controller

Software Design/Development Status AutopilotAutopilot –Tested and verified communication protocols. –We have to make customizations to ArduPilot Mega for our airframe and components. Need to finalize and test PWM input on channel 5.

Software Design/Development Status SD CardSD Card –Standard SD communication IIC and parallel data bus - CameraIIC and parallel data bus - Camera –Start condition –End condition –pre-stored in FIFO before being sent out

Software Design/Development Status IIC Battery ManagementIIC Battery Management –1 wire bus system –Micro controller is the master –Four protocols initialization sequence (reset pulse followed by presence pulse)initialization sequence (reset pulse followed by presence pulse) write-0write-0 write-1write-1 read dataread data

Software Design/Development Status Micro controllerMicro controller –PWM Micro controller PWM used to simulate 5 th RC channel input to planeMicro controller PWM used to simulate 5 th RC channel input to plane Micro generates different frequencies to switch flight modesMicro generates different frequencies to switch flight modes –UART Handle communication between the XBee and the micro controllerHandle communication between the XBee and the micro controller Micro controller will capture telemetry data from the autopilotMicro controller will capture telemetry data from the autopilot Pass data to the autopilot using ArduPilot Mega’s packet systemPass data to the autopilot using ArduPilot Mega’s packet system

Software Flow Chart

Software Flow Chart (contd)

Project Completion Timeline TaskTeam MemberDate Order all partsAll members10/18/10 Finalize PCBJigar/Chandler10/20/10 Prototype hardwareAll members10/29/10 Complete software for prototyped hardware JT/Eric11/05/10 Begin preparations for PCB construction All members11/12/10 Begin PCB constructionAll members11/22/10 Verify PCBAll members11/27/10 PackageAll members11/30/10 Prepare for demosAll members12/03/10

Questions / Discussion