Proximity Sensor Board: Proximity Sensor Board: Final ReportFinal Report

Sarat BhogavalliNathan Ellefsen

Ryan FigMichel Kinsy

Mentor: John Winters

IntroductionIntroduction

•Board Overview

•Applications for Board

•Original Problem Statement

•Our Analysis of the Problem

•Different Design Approaches & Implementation Phases•E-field Sensor

•Voice Recorder

•Hybrid System Attempt

•Conclusion

•Q & A

» 32K to 512K Flash memory» Up to 60 MIPS» DSP and MCU functionality» JTAG real-time debugging» Four 36-bit accumulators» Three 32-bit address buses» Large peripheral set» MCU-style software stack support» Controller-style operating modes

Board Hardware LayoutBoard Hardware Layout

• MC56F8323 CPU• MC33794 Electric Field Imaging Device• RESET button• IRQ button• SW1 button• GPIO / SERIAL Port (16 pin)*• TIMER / PWM Port (16 Pin)*• ADC Port (10 Pin)*• JTAG Port (14 pin)• 10 LED’s• Microphone with amplifier• Stereo Audio output with filters & AMP• 3.5mm Stereo jack• Speaker

Demonstration Board FeaturesDemonstration Board Features

Applications for BoardApplications for Board

• Automotive control • Industrial control/networking• Motion control• Home appliances• General purpose inverters• Medical monitoring

Original Problem StatementOriginal Problem Statement

- E-field• Initial loud clipping sound from speaker• Lack consistency of detecting nothing when no object present

- Microphone• Latencies in recording and lack of quality.

Our Analysis of the ProblemOur Analysis of the ProblemBoard Schematics

Sine Table ModificationSine Table Modification

•Modify current buzzing noise

•Make sound more appealing

““Alert” AnalysisAlert” Analysis

Original Sine Wave

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Sine Table FrequenciesSine Table Frequencies

Design Approaches & Implementation Phases Design Approaches & Implementation Phases

E-Field Code

•Modified the PWM Interrupt method

- Checks for the calibrated board and an object in contact.

- if((SineTableStep == 21) && (Calibrate == 0))

If current state is less than 10; gives a note from the sine table

•Modified music note played in each state

- Tailored SineTable to middle C scale (8 notes)

- Adjusted SineTableStep variable for each state

New Sine Table FrequenciesNew Sine Table FrequenciesModified Square Wave

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Microphone CodeMicrophone Code

•Recorded voice onto board and playback•Modified PLL Lock

•Record up to 5 second message

•Press “IRQA” button to record

•LED’s react to voice

•Press “SW1” to playback

• Code // reenable buttonsBTN1_Enable();BTN2_Enable();

// change state to IDLEDemoState = IDLE;

Implementation DataImplementation Data

Code Sizes

• E-Field- Sine Table 4 KB

- Recorded Sample 24 KB

- Main file 17 KB

• Microphone- Main file 18 KB

•Bit Stream sizes•E-Field

•11.7 KB

•Microphone•6.8 KB

Merging E-Field & Microphone CodeMerging E-Field & Microphone Code

• Maximize functionality of board

• Not fully functional due to limitation of the on-chip RAM

• Combined code & bit stream sizes: - Main file 21 KB- 18.6 KB

ConclusionConclusion

•Not able to successfully combine E-Field & Microphone code to maximize functionality

•Implemented an new message into playback table for the E-field “Alert”

•Improved consistency of E-Field proximity detection

•Corrected and optimized the microphone code

Q & AQ & A