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MSD Detailed Design Review Agenda P11212 : LVE Controls, RF Module

MSD Detailed Design Review Agenda P11212 : LVE Controls, RF Module. Meeting Purpose 1. Present an overview of the project. 2. Review Detailed Design. 3. Establish understanding of the Design through Feasibility analysis. 4 . Review Test Plan and Plan to meet Customer Needs.

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MSD Detailed Design Review Agenda P11212 : LVE Controls, RF Module

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  1. MSD Detailed Design Review AgendaP11212 : LVE Controls, RF Module • Meeting Purpose • 1. Present an overview of the project. • 2. Review Detailed Design. • 3. Establish understanding of the Design through Feasibility analysis. • 4. Review Test Plan and Plan to meet Customer Needs. • 5. Discuss feasibility and possible alteration of plan. • Materials to be Reviewed • 1. Project Description • 2. Engineering Specifications • 3. Preliminary Test Plan / Plan to meet customer needs • 4. Risk Assessment and Actions to minimize Risk • 5. Bill of materials • 6. Drawings and Schematics • 7. FeasibilityAnalysis • 8. Thoughts and Concerns

  2. Meeting Timeline

  3. Engineering Specifications

  4. Preliminary Test Plan

  5. Risk Assessment

  6. Risk Assessment

  7. Bill of Materials

  8. GUI Code Structure

  9. GUI Mockups • GUI mockups are images meant to get the idea of the GUI, rather than a working implementation • The following windows have been mocked up: • The Main window • The Main window’s menu bar • The joystick configuration screen • The keyboard configuration screen

  10. Main GUI

  11. Main GUI Connect Menu

  12. Main GUI Options Menu

  13. Joystick Control Options

  14. Keyboard Control Options

  15. Arduino Code Structure

  16. Schematic

  17. PCB Layout

  18. L298 Block Diagram

  19. L298 Pinout

  20. DC Motor Control

  21. L298 High Current configuration

  22. NanoDevboard Schematic

  23. System Analysis • Delay through transmission: • Theoretical message size: 18 bits • Single Message Latency: • Time through USART: 18b / 31kBps = 72us • Time through RF: 18b / 40kbps = 450us • Total time: 72us + 450us = 522us • Max messages: 5 • Max messages size: 90 bits • Max Message Latency: • Time through USART: 90b / 31kBps = 362us • Time through RF: 90b / 40kbps = 2.2ms • Total time: 362us + 2200us = 2.562ms • Forward Backward Left Right M1 + M1 - M2 + M2 - M3 + M3 - M4 + M4 - M5 + M5 - M6 + M6 - M7 + M7 - M8 + M8 – • 5 bit: instruction 0-31 • 4 bit: speed 0-15 • X bit: redundancy • 5 instructions at once • (5+4+9)*5= 90 bits/instruction set

  24. System Analysis • VIN = 7.2v • IOUT(max)= 3.3A per motor • Absolute Max ratings • VSS=50v • IO • Peak non-repetitive = 3A • Repetitive = 2.5A • DC operation = 2A • PTotal= Total power Dissipation at 75C is 25W • Operating temperature -25C to 130C • As you can see the Peak non-repetitive is below the possible IOUT so an alternative configuration is required. From the L298 data sheet found at http://www.st.com/stonline/books/pdf/docs/1773.pdf • Using a Paralleled input and output configuration the L298 can support up to 3.5A of repetitive peak current. • Design will require 1 L298 in a paralleled configuration per motor. • PTotal >= VIN*IMAX 25 > 23.76 • VIN<= VSS MAX

  25. System Analysis

  26. System Analysis • VLOGIC from Nano dev board is 5V which falls within the acceptable range. • IIH from Nano dev board is 40μA which is less than 100μA • Requirements for ArdunioNano • Input Voltage 6-20V, 7.2 falls in the range • Current draw on the Nano Dev board • L298 72mA • Atmega 12mA • L298ENABLE 2mA • FTDI 15mA • LEDs 5mA • Total draw = 116mA • Total supported 500mA

  27. System Analysis • Based on previous years thermal considerations the primary concern for heat generation in the design was the voltage regulation. Because our current design does not have a voltage regulator besides the one on the Micro-Controller dev board it will not have to be considered. The next board component of concern was the H-bridge for this the following equations will be used • Δt = PDMAX * Rjc and Tjmax = Δt + Tamb • PDMAX=25W • Rjc= 3C/W • Δt=75C • Tjmax = 75+22=97C • This value is within the effective operating range of -25 to 130C.

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