Integrating Bluetooth onto LEGO Robots

Andrew Jones

Mike Krofcheck

Project PurposeProject Solution and GoalsDesign GoalsResults and ConclusionsAcknowledgments Q & A

Agenda

Problem to be solved

• EECS 375 robot designs repeated often

• Limitations with wired communication– Difficult to download code– Robots don’t “talk”– Limited teamwork during

competition

Project Solution & Goals

• Design integrated Bluetooth communication board for use with serial devices

• Develop Bluetooth driver software for use with microcontroller

• Integrate communication board with EECS 375 robots

Acquire parts for projectDesign high frequency RF antennaDesign/Fabricate PCB for moduleTest and verify operation PCBIntegrate PCB with host computerIntegrate PCB with host microcontroller

Design Steps

Design Steps

Acquire BTM

PCB/Antenna design

Micro. development

Verify PCB IntegrateAndrew/Mike

Mike

Andrew

Andrew/Mike Andrew/Mike

Acquiring Bluetooth

Found module for purchase in U.K.Windigo Systems BCM02C2XX-RAll-in-one solution

68HC12 micro. development kit Acquired from “Frank”Feature set

Integrated Inverted-F Antenna (IIFA)

Compact sizeIntegrated on to PCB

Redundancy in antenna design

Antenna Design

High frequency concernsDecoupling capacitorsComponent placementAntenna & ground plane

Test points

PCB Design

PCB Verification

Visual inspectionTrace continuityInitial RF output detectionInterface w/ host via RS232

RS232-to-UART converterVoltage conversion processUse of Max232

Signal connection scheme

BTM Integration

BTM Integration

BTM <> HC

2 <--> 3

3 <--> 2

7 <--> 8

8 <--> 7

N/A GND<-- 5

BTM Integration

ConversionTxD RxD

Generic BT communication board created that could interface with serial devicesBT developer support limitedGreat deal learned during projectFuture work on project ...

Results & Conclusions

Frank MeratBob LeskovecRob BarrisQuinton S.Q. Yuan

Acknowledgments

Q & A