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Bluetooth Monitor for PowerFilm Solar Panels

Bluetooth Monitor for PowerFilm Solar Panels . SDDEC1107 Alex Rannow , Tim Fox, Arthur Fiester , Jacob Rasmuson , Collin Howe. Project Goal.

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Bluetooth Monitor for PowerFilm Solar Panels

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  1. Bluetooth Monitor for PowerFilm Solar Panels SDDEC1107 Alex Rannow, Tim Fox, Arthur Fiester, Jacob Rasmuson, Collin Howe

  2. Project Goal • PowerFilm Solar Inc. wishes to have a device that can monitor voltages and currents of their foldable solar panels. The project is to design a remote measurement device that can communicate with a smartphone. • A Bluetooth device, that can communicate with an Android phone over Bluetooth. • A counterpart Android application that is able to control and monitor the device and estimate battery life and charging time.

  3. Concept Sketch

  4. Sensing · Sense Current : - From Solar panel - Into Device Being Charged · Sense voltage : - @ Integrated battery - @ Device being charged Processing Displaying · · Process the data from the Receive Bluetooth data · sensors Control processing via · Log data from the sensors Bluetooth · · Broadcast requested data via Display data in a user friendly Bluetooth format Functional Decomposition • The project can be decomposed into three ‘Blocks’ • Sensing: The circuitry that allows the microprocessor to sense voltage and current at measurement points. • Processing: The microcontroller itself. This is where the data is interpreted, logged, and broadcast. • Displaying: The Android phone app. This configures the processing, receives the data broadcast, and displays it tothe user.

  5. System Architecture

  6. Technology Choices/Platforms CSR : BC4 PC-ROM Bluetooth 2.1 +EDR onboard microcontroller.  Satisfies all requirements except it contains an onboard 8-bit ADC in which requirements specify we need a 12-bit ADC.  The ADS7866 will be attached to provide a 12-Bit ADC.  TI CC2540 Bluetooth Low Energy (BLE) onboard microcontroller.  Satisfies all requirements except the Bluetooth compatibility.  BLE's new standard is not backwards compatible and will not connect with modern Android devices.  An external Bluetooth radio will be necessary. TI MSD430F2013 a 14-pin microcontroller that has no Bluetooth capabilities but is within our low energy standard and well below the budget.  A simple external Bluetooth radio will be needed to fulfill all requirements.

  7. System Analysis/Design Tradeoffs • Power Used Vs. Transmit PowerThe power requirement restricts the possible power we can use in Bluetooth radio communication. • Antenna size Vs. GainA larger antenna will provide more gain. We area restricted to 1” by 1”, so we must use an antenna that fits within that requirement.

  8. Module Design • Microcontroller & RadioThe microcontroller must be able to use the radio to communicate with the Android device. • Current/Voltage ScalingSteps down high voltage to ADC level, amplifies voltage drop across very small resistance to measure current.

  9. Module Design • Power SupplySupply constant power at a stable voltage to the microcontroller and radio • Android ApplicationPoll the device at user-specified intervals and report back to the user. Display data in friendly format and allow user to change polling settings.

  10. Interface Design • Bluetooth Radio CommunicationWell defined by standards • Current/Voltage SensorsAnalog scaling circuits for ADC conversion • Android ApplicationHuman interface

  11. Test Plan

  12. Schematic

  13. Schematic, Microcontroller

  14. Cost Estimation

  15. Questions?

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