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ANIBIKE (PART I) PROJECT OVERVIEW

Jonathan YitzchakiDavid MichaeliInstructor: Ina RivkinSpring 2009

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PROJECT DESCRIPTION

Implementation of a wheel animation unit .

Monochromatic 4-level light intensity. Two side by side 16- LED radius arrays. Angular resolution: 128 degrees 3X1.5V batteries.

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PROJECT GOALS

Implement a digital circuit for showingimages/animations using LEDs over bicyclewheels.

Usage of uController as system heart. Design of hybrid Digital/Analog system. Design of a designated computer program for

interfacing with the circuit. MINIMAL production cost.

.

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FIELDS

• uC Embedded

• Host SW C# application

• Image processing

SW

• Analog/ digital Circuit

HW

• Circuit assembly

• Prototypes construction

Mechanics

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HARDWARE

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HW- MAIN COMPONENTS

Atmega48 - micro controller

EEPROM Hall effect sensorUSB controller

LED’s

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C

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HW -PERIPHERAL COMPONENTS

NPN transistorsEnhances the current

for maximal illumination

JTAG CONECTOR

Enables uploading

embedded SW

USB connector

ResistorsRegulates current

for LED’s

CapacitorsCurves voltage

for digital components

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C

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HW-SYSTEM LAYOUT

Non-Volatile Memory

Atmega48

Hall Sensor

USB controller and connector

JTAG

Clock

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LED array

mC

mem

Hall sensor

HW –ILLUMINATION FLOW

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HW- LED CURRENT

, ,

CCV const

E B BEC

eq eq

C B BE B BELEDi

LEDi Ri LEDi Ri

V V VI

R R

I V V V VI const

N RN RN

LED pulls – (min) 5mA in max Illumination, uC max current (25mA) per channel is exceeded.

Per-LED current remains constant,

1, 1 2, 2 8, 8 1, 1 2, 2R || || ... || ... LEDi Rieq LED R LED R LED R LED R LED R

RR R R R R

N

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HW-LED CONTROL

4 global “ROWS” 4 Columns for each radius(data is on columns)

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HW – LED ILLUMINATION CYCLE

L2 L1

L2 L1

L2 L1

L2 L1

Each “four” gets a 25% duty cycle

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HW- PWM

Light intensity Memory Pixel Format PWM Sequence0% 00 00033% 01 00166% 10 011100% 11 111

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COMMUNICATION PROTOCOLS

uC <->EEPROM – SPI uC <->USB controller – UART uC <->Hall sensor – Interrupt channel uC <->programmer - SPI USB controller <-> Host - USB

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SOFTWARE

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SOFTWARE - EMBEDDED STATES

Illumination mode

Idle

Uploading mode

Memory fetch

Memory wrap-

around

Start Hal

l Sen

sorHall Sensor

Memory wrapped-around

RS232 in

terr

upt

“Exi

t” c

om

mand

Fetch finished

time exceededd

RS232 interrupt

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180 degree phase delayOne “chunk” is 32bitsX2

MEMORY PICTUREEEPROM Mem layout

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SOFTWARE- EMBEDDED

Illumination mode• Chunk is fetched every angular tic.• Chunk Is illuminated

After Hall interrupt• Cycle is timed, time allocated for angular

resolution is calculated.• Memory is wrapped

Uploading mode• Host interrupt• Picture is uploaded to memory

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SOFTWARE- EMBEDDED

Uploading mode• RS-232 connection is established.• Picture is uploaded to memory

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Link to program

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SOFTWARE – IMAGE PROCESSING

In c# application: Cartesian-To-Polar Converter. Bilinear interpolation. Conversion to downgraded 4-level color

depth. “Encrypted” data is loaded to EEPROM.

During runtime: The data is transferred from EEPROM to uC

chunk by chunk and cached (saves 50% of picture size).

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MECHANICS

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MECHANICS

Circuit assembly• Wire wrap on

development board

Mechanical prototype• Made of general use

CAPA• Hand made improvising

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SUMMARY

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DEVELOPMENT STAGES

•Defining acquisitions needs and ordering of hardware.

•Acquiring enough knowledge concerning uController programming. Understanding our unique needs.

•Designing debug prototype.

•Building debug prototype system.

•Successfully simulating memory management unit.

•Receiving ordered hardware.

•Building debug prototype system (cont.)

•uC software design.

•Debugging.

•Mid-Semester presentation.

•Debugging.

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DEVELOPMENT STAGES

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“GOOD”S AND “BAD”S

HW component supply, lab support (Bruria).Project expanses.

Lab computer environment.

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ADDITIONAL INFORMATIONAni-Book

Questions?

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FINAL RESULTS:

AND now Live…

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ANIBIKE 2

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FUTURE FEATURES (PART II)

Full Color display (RGBX8bits). “On wall” unit. PCB design:

LED connectivity lines. Circuit board.

32 RGB LEDs (SMT) radial resolution. Extended external memory (SD card)

with FAT12 file system support.

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PURCHASING

RGB LEDs (SMT). PCB printing. SD cards. Designated motor & mechanics(3D

print)?