S15: Wireless Power Transfer System

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Grading Criteria

  • How well is Software & Hardware Design described?
  • How well can this report be used to reproduce this project?
  • Code Quality
  • Overall Report Quality:
    • Software Block Diagrams
    • Hardware Block Diagrams
      Schematic Quality
    • Quality of technical challenges and solutions adopted.

Wireless Power Transfer System

Abstract

                                                      File:Trans rec wrel.jpg


Wireless power transfer or wireless energy transmission is the transmission of electrical power from a power source to a consuming device without using solid wires or conductors. The technology dates back when Tesla first created his coil and the project is based on that idea. As the world is gaining momentum on wireless communication technology, there is a niche market for wireless power transfer for low power devices. This project explores one such idea and implementation for wireless power transfer from source to destination. The project is limited to near field application of such technology. The project does not explore the EMI/EMC aspects of the design.

Objectives & Introduction

Show list of your objectives. This section includes the high level details of your project. You can write about the various sensors or peripherals you used to get your project completed.

Team Members & Responsibilities

  • Team Member 1
    • Haroldo Filho - Lead Software Engineer
  • Team Member 2
    • Hemant Raman - Lead Hardware Engineer
  • Team Member 3
    • Hassan Naveed - Software Implementation
  • Team Member 4
    • Guangyu Chen - Software Implementation

Schedule

Week# Date Task Actual
1 4/14 
 -Light an LED wirelessly
 -Test ADC: read 0~3.3V range
 -Test Nordic wireless: send/receive ADC value
Completed.
2 4/21 
 -Find channel frequency: 7.7MHz
 -Define wireless package structure: status and commands
 -Spec/order motor
Completed
3 4/28 
 -Implement wireless communication
 -Define software architecture layers
 -Define error code and handler
 -Implement motor control
Completed, See software design section below for details
3 5/5 
 -Evaluate ADC reading dynamics and design LPF
 -Implement software architecture layers
Completed, uneven voltage waveform was giving inconsistent readings, therefore, average value of 1000 samples was used to calculate the voltage at the receiver end.
3 5/12 
 -SW/HW Integration and testing.
Completed, there were issues with finding the optimum spot for the receiver in the initial scan, but it was resolved.

Parts List & Cost

Item# Qty Reference Part Name Manufacturer Description
1 4 C1-4 CAPMICA1,10pF IPC SM-782 STD. MICA TANTALUM CAPACITOR 5.69 X 10.9 MM
2 2 D2-3 DIO-MLL41 IPC SM-782 SURFACE MOUNT DIODE, MELF
3 1 L3 IND-MOLDED,849nH Regular Copper Pipe 15 inches Dia Loop MOLDED INDUCTOR, 0.5" PIN SPACING
4 2 L1-2 IND-UPRIGHT,100uH UPRIGHT INDUCTOR WITH CORE
5 1 D1 MLED76 MOTOROLA INFRARED LED
6 1 R6 RES-1/4W,100 ohms RES BODY:100 CENTERS:500
7 1 R7 RES-1/4W,10K RES BODY:100 CENTERS:500
8 1 R5 RES-1/4W,4.7K RES BODY:100 CENTERS:500
9 1 R1 RES-1/4W,5.6K RES BODY:100 CENTERS:500
10 2 R3-4 RES-1/4W,68 ohms RES BODY:100 CENTERS:500
11 1 R2 RES-1/4W_SMALL,5.6K RES BODY:100 CENTERS:500
12 1 S1 SW-NKK-JF15 NKK JF15SP3C NKK SPST N/O MOMENTARY PUSHBUTTON SWITCH
13 3 U1-3 TO220-4_MOSFET

Design & Implementation

The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.

Hardware Design

                                                              File:Transmitter.pdf‎

Hardware Interface

In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.

Software Design

For the software design, we define a layered architecture where each layer takes its services from the layer directly below it. The integrity of layered system was important as to ensure that no race conditions are generated where two tasks wait indefinitely for each other. The layers are:

  • WIFI : Receive wireless packet from mesh network and pass the packet to communication layer for decoding.
  • Communication : Decode the packet and execute corresponding actions.
  • Motion Control : Control the motor to move to the desired position.

Package structures between three layers: 

Wireless Data Package Structure
|| 1 byte   | length - 1 ||
|| commands |    Data    ||

Status Package Structure
||   1 byte   |      1 byte      |      1 byte      |     x byte     ||
|| Error byte | ADC upper 4 bits | ADC lower 8 bits | Motor position ||

Error byte Structure
|| 8th bit  | 7th bit  | 6th bit  | 5th bit  | 4th bit  | 3rd bit  | 2nd bit  | 1st bit  ||
|| reserved | reserved | reserved | reserved | reserved | reserved | reserved | Busy bit ||

Motion Control Package Structure
|| 1 byte  |   1 byte    |   1 byte    |   1 byte    ||
|| Command | Parameter 1 | Parameter 2 | Parameter 3 ||

Implementation

This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.

Testing & Technical Challenges

Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.

Include sub-sections that list out a problem and solution, such as:

My Issue #1

Discuss the issue and resolution.

Conclusion

Conclude your project here. You can recap your testing and problems. You should address the "so what" part here to indicate what you ultimately learnt from this project. How has this project increased your knowledge?

Project Video

Project Source Code

References

Acknowledgement

We would like to thank our instructor Preet for always inspiring and encouraging us to learn and and explore new projects related to embedded systems. We really appreciate his patience and his guidance.

References Used

List any references used in project.

Appendix

You can list the references you used.

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