ece 477 design review team 07 fall 2007

ECE 477 Design Review ECE 477 Design Review Team 07 Team 07 Fall 2007 Fall 2007

OutlineOutlineProject overview Project overview Project-specific success criteriaProject-specific success criteriaBlock diagramBlock diagramComponent selection rationaleComponent selection rationalePackaging designPackaging designSchematic and theory of operationSchematic and theory of operationPCB layoutPCB layoutSoftware design/development statusSoftware design/development statusProject completion timelineProject completion timelineQuestions / discussionQuestions / discussion

Project OverviewProject Overview

Hand held TV remoteHand held TV remote- Can “learn” IR signals from existing remotes and - Can “learn” IR signals from existing remotes and

recreate these signalsrecreate these signals

LCD display on deviceLCD display on device- Capable of receiving a composite video stream at - Capable of receiving a composite video stream at

2.4GHz and display it on the screen2.4GHz and display it on the screen

Touchscreen interfaceTouchscreen interface- Can take touch input on screen to change channel on - Can take touch input on screen to change channel on

device and change channel on TVdevice and change channel on TV

Project OverviewProject Overview

Runs on rechargeable batteriesRuns on rechargeable batteries

The device runs on rechargeable batteries and The device runs on rechargeable batteries and has a built-in charging interface to charge the has a built-in charging interface to charge the batteries from a wall wart inputbatteries from a wall wart input

2.4 GHz video receiver2.4 GHz video receiver

Receives composite video from a 2.4GHz Receives composite video from a 2.4GHz transmitter. This transmitter is connected to an transmitter. This transmitter is connected to an external TV box with remote capabilities.external TV box with remote capabilities.

Project-Specific Success CriteriaProject-Specific Success Criteria

PSSC #1PSSC #1An ability to decode a Composite video signal An ability to decode a Composite video signal (transmitted via a 2.4 GHz wireless link) and display it (transmitted via a 2.4 GHz wireless link) and display it on an LCD touchscreen.on an LCD touchscreen.

PSSC #2PSSC #2An ability to input user commands from An ability to input user commands from

an LCD touchscreen. an LCD touchscreen.

Project-Specific Success CriteriaProject-Specific Success Criteria

PSSC #3PSSC #3An ability to program (“learn”) the IR An ability to program (“learn”) the IR modulation scheme used by the user’smodulation scheme used by the user’stelevision set and “cable box”. television set and “cable box”.

PSSC #4PSSC #4An ability to transmit IR commands An ability to transmit IR commands

(separately) to a television receiver and to (separately) to a television receiver and to a “cable box”.a “cable box”.

Project-Specific Success CriteriaProject-Specific Success Criteria

PSSC #5PSSC #5An ability to intelligently recharge the An ability to intelligently recharge the

remote’s battery and monitor its status remote’s battery and monitor its status

(e.g., display a battery fuel gauge). (e.g., display a battery fuel gauge).

Block DiagramBlock Diagram

Component Selection RationaleComponent Selection Rationale

Microcontroller – Microcontroller – PIC24 Series by MicrochipPIC24 Series by Microchip Processing power: 80 MhzProcessing power: 80 Mhz On-chip peripherals: SCI, SPI, TIM, ATD, PWMOn-chip peripherals: SCI, SPI, TIM, ATD, PWM Cost: $10.70Cost: $10.70 Low power consumptionLow power consumption

Component Selection RationaleComponent Selection Rationale

LCD Module – LCD Module – MTF-T035DHSLP-A by MicrotipsMTF-T035DHSLP-A by Microtips

Size and resolution: 3.5” diagonally, 320x240 at 18 bit, 30 fpsSize and resolution: 3.5” diagonally, 320x240 at 18 bit, 30 fps Integrated touch panelIntegrated touch panel Digital input: TFT interfaceDigital input: TFT interface Cost: $47Cost: $47

Component Selection RationaleComponent Selection Rationale

Touch Screen Controller – Touch Screen Controller – ADS7843 by TI ADS7843 by TI Serial InterfaceSerial Interface Low power consumption:Low power consumption:

750μW at a 125kHz throughput rate and a 2.7V supply750μW at a 125kHz throughput rate and a 2.7V supply Under 0.5μW during shutdown modeUnder 0.5μW during shutdown mode

Energy Conservation: Energy Conservation: Accurate output on first conversion cycle Accurate output on first conversion cycle Pen Interrupt Request Feature.Pen Interrupt Request Feature.

Component Selection RationaleComponent Selection Rationale

Wireless Receiver – Wireless Receiver – AWM634RX by AirwaveAWM634RX by Airwave Compatibility with NTSC video formatCompatibility with NTSC video format Low power consumptionLow power consumption Operation Frequency Range of 2400 ~ 2483MHzOperation Frequency Range of 2400 ~ 2483MHz Cost: $27Cost: $27 Works ideally with sister transmitter (AWM630TX) with cost of $16 Works ideally with sister transmitter (AWM630TX) with cost of $16

Component Selection RationaleComponent Selection Rationale

Battery Charger – Battery Charger – DS2715 by Dallas SemiconductorDS2715 by Dallas Semiconductor Can charge battery packs with anywhere between 1 and 10 batteriesCan charge battery packs with anywhere between 1 and 10 batteries Works with NiMH batteriesWorks with NiMH batteries Allows use of batteries during chargeAllows use of batteries during charge

Battery Monitor – Battery Monitor – DS2438 by Dallas SemiconductorDS2438 by Dallas Semiconductor Simple three pin interface (Positive Lead, Negative Lead and MicroC interface)Simple three pin interface (Positive Lead, Negative Lead and MicroC interface) Works for NiMH batteriesWorks for NiMH batteries Designed for battery packs between 2 and 6 batteriesDesigned for battery packs between 2 and 6 batteries

Packaging DesignPackaging Design

Packaging Considerations:Packaging Considerations:AA BatteriesAA Batteries

2.01” Length2.01” Length0.56” Diameter0.56” Diameter6 Batteries Total (2 Columns, 3 Rows)6 Batteries Total (2 Columns, 3 Rows)

LCD ScreenLCD Screen3.5” Diagonal3.5” Diagonal

IR LEDsIR LEDs3 push buttons for power3 push buttons for powerHandheldHandheld

Packaging DesignPackaging Design

Schematic/Theory of OperationSchematic/Theory of Operation

Schematic/Theory of OperationSchematic/Theory of Operation

Schematic/Theory of OperationSchematic/Theory of Operation

Schematic/Theory of OperationSchematic/Theory of Operation

Schematic/Theory of OperationSchematic/Theory of Operation

Schematic/Theory of OperationSchematic/Theory of Operation

Schematic/Theory of OperationSchematic/Theory of Operation

Schematic/Theory of OperationSchematic/Theory of Operation

PCB Layout - PCB Layout - ConsiderationsConsiderations

Placing the power management portion of the PCB at the lower end to allow easy access to the battery pack

Separate the analog (2.4GHz receiver and ADC) portion from the digital (LCD, Touch controller, Microcontroller) portion

Place Receiver on the top left of the device to minimize noise picked up by the antenna

Place oscillator as close to the ADC as possible Place bypass capacitors as close to IC’s as possible Avoiding 90deg traces (using 135deg traces) Separate grounds for analog and digital circuits

PCB Layout – PCB Layout – Component PlacementComponent Placement

PCB Layout – PCB Layout – Bypass Cap for MicroCBypass Cap for MicroC

PCB Layout – PCB Layout – ADC Oscillator PlacementADC Oscillator Placement

PCB Layout – PCB Layout – Charger CircuitCharger Circuit

PCB Layout – PCB Layout – Plan of ActionPlan of Action

Complete routing (possibly un/reroute) to better optimize traces

Add mounting holes to the edges of the board

Add RS-232 port for programming MicroCAdd level translation for RS-232Add socket for wall wart input at an edgeAntenna being wired to header on board

Software Design/Development StatusSoftware Design/Development Status

Software Design/Development StatusSoftware Design/Development Status

Software Design/Development StatusSoftware Design/Development Status

Project Completion TimelineProject Completion Timeline

Questions / DiscussionQuestions / Discussion