Team 8:Nate Gimple Steven Tighe Amit Halevi Noah Husek

Project SummaryLED Cube!RGB LEDs512 LEDs, 64 microcontrollersMassively networked (64 microcontrollers

intercommunicating)Uses the Atmel ATxmega64A1Uses the Altera Nios II softcore

Noah

Project StatusPrototype boards orderedAlmost all components acquiredMicrocontroller intercommunication via

UARTCurrently slightly under budget!Familiarization with Nios II IDEFamiliarization with Xmega IDE

Noah

Nios II

supernode 0

supernode 1

supernode 7

node 0(LED)

node 1 node 7

module 0…

…

supernode 8

supernode 63

Hierarchy / block diagram

…

I2C

sensorinput

user input

Amit

AddressingFractal

1st digit = top or bottom2nd digit = back or front3rd digit = left or right 000 011 100mod sup nodeThis address indicates:

Top, back, left module Top, forward, right supernode Bottom, back, left node

3 bits of address: Eases writing generic code

011

000

111110

101100

010

001

Amit

Communication Scheme

Supernode

SupernodeSupernode

Supernode

Supernode

Supernode

I2C

UART

Amit

ATxmega64A132 MHz64 kB Flash memory8 USARTs4 I2CSPIIntegral timers2 12 bit ADCs128 bit crypto engine!Donated by Atmel

Amit

Altera + Nios IIMaster controller FPGAProcessor implemented with logic synthesisSoftcore capable of running C I2C will be implemented in hardware, with

use of extension headers on board

Noah

TI TLC5947 LED Driver24 channels12 bit PWMSerial inputProgrammable constant current sinkUp to 33 V on each channelQFN 32Considered discrete MOSFET drivers

Not enough ports on chipFootprint => 2 layer

Donated by TINoah

RGB LED4 lead, common anodeDiffused epoxy5 mm diameter20 mAUsing leads as structural memberSurprisingly expensive to buy 500

Noah

PCBs3 kinds of PCBs

Supernode 1.7” x 1.7”Row 0.3” x 2.0”Column 0.4” x 3.9”

Need 64, 64, 96 respectivelyAll 2 layerSupernode was originally 4 layer

Changed to 2-layer for costUse of QFN package LED driver allowed this

Steven

Supernodes: Schematic 1

Steven

Supernodes: Schematic 2

Steven

Supernodes: Layout

Steven

Rows and Columns

Steven

Power SupplyComputer power supplies

Highly regulated voltage5 V, 3.3 V, 12 V available => 5 V usedInternal soft start

inrush current isnot a problem

Nate

BOM and Budget

Nate

Item Part # value Quantity Cost ($) Ext. Cost ($) DescriptionLED - RGB 600 0.3280 196.80 4 pin RGB common anode 5mm diffused LEDmicrocontroller ATxmega64A1 - 64 0.0000 0.00 Free! Donation from Atmel.LDO ADP3338 3.3V 64 0.0000 0.00 3.3V LDOLED driver TLC5947 - 64 0.0000 0.00 Free! 24 channel PWM LED driver from TIi2c buffer LTC4300A-1CMS8#PBF-ND - 1 3.5000 3.50 i2c hot-swappable driver/bufferNTC thermistor 495-2116-1-ND 10 kΩ 100 0.2470 24.70 temperature sensorphotocell PDV-P9001-ND - 64 1.0200 65.28 light sensormicrophones BOB-08669 - 4 7.9500 31.80 sound sensorop amp AD8052 - 64 0.0000 0.00 dual op amp to buffer sensorscapacitor TPSE337 330 µF 64 0.0000 0.00 tantalum cap for 5V capacitor - 4.7 µF 320 0.0000 0.00 ceramic decoupling caps for 3.3V and 5V (LEDs)capacitor - 0.1 µF 640 0.0000 0.00 ceramic decoupling caps for µCresistor 741X043103JPCT-ND 10 kΩ 100 0.0110 1.10 pull-up for i2cresistor P2.55KHCT-ND 2.55 kΩ 200 0.02255 4.51 sets IREF constant currentconnectors WM2701-ND 3 pin 96 0.0000 0.00 headers to connect supernode PCBs laterallyconnectors SAM1034-50-ND 100 pin 4 4.1000 16.40 headers to connect supernode PCBs verticallypower supply - - 2 0.0000 0.00 old computer power supplies for +5V railsolder paste KE1507-ND - 1 30.6300 30.63 for SMD solderingKapton film 2271K2 12" x 12" 2 11.4900 22.98 for SMD stencilPCBs - - 240 - 600.00 supernodes, rows, columns

Total 997.70

Schedule

Nate

Accomplishments by CDRA review

(Kind of)

Nate

What’s left?Physical assembly

Kapton stencil + solder paste + pick and place = PCA

Insert through-hole LEDs by handAttach through-hole headers by handAcrylic base for structure and æsthetic

CodingXmega and Nios IIBasics are down, now we just need the

specifics

Nate

Potential Problems/ConcernsNoise on the board

Fast switching LEDs – 20 mA @ 1 kHzLots of serial communications everywhere

Inductive kickbackRelatively large current loops to LEDs

Communication with LED driverSPI?Bit-banging?

I2C capacitanceUsing I2C buffer/driver (LTC4300A)

Time!

Nate

Milestone 1

Amit

Milestone 2Full cube constructionMore complex super-node autonomous

scriptsEnvironmental inputSimple algorithmic games (GOL)Be ready for expo

Amit

Questions?