A little black box for your motorcycle
Cas Craven
Nick Paine
Glen Rhodes
Lev Shuhatovich
Joe Zugelter
• Concept
• Hardware Design
o
o
o
9S12 Microcontroller
Fonera Wireless Router
Motorcycle
• Software Design
o
o
o
o
9S12 Microcontroller
Fonera Wireless Router
iPhone Interface
Web Display
• Hardware and Software to track motorcycle state
over time
o
State





GPS Location
RPM
Velocity
Acceleration
Gear
Motologger
Accelerometer
GPS
Battery
Function Switch
Ignition Coil
Speed Sensor
Gear Position Sensor
System Diagram
Motologger
Battery
Accelerometer
GPS
Function Switch
Ignition Coil
Speed Sensor
Gear Position Sensor
Data Flow
Wifi SoC
Atheros AR2315
Data Acquisition
Board
Serial
SPI
Wifi
• Hardware Required
o
o
o
o
o
o
o
Motorcycle
GPS Reciever
Accelerometer
SD Card
Freescale 9S12X @ 40MHz
Fonera Wireless Router
iPhone
Fonera Router
 Atheros MIPS-based SOC@180MHz
 Redboot
 OpenWRT
 SD MMC Driver
 User Application
 Kernel Panics are free
 Trashing JFFS2 Made Easy!
External Inputs
Power
Distribution
Battery Power
Ignition Switch
Speed Sensor
Analog
Conditioning
Analog
Conditioning
Gear Position
Analog
Conditioning
Power LED
Status LEDs
Analog
Conditioning
Ignition Coil
External Outputs
Microcontroller
MC9S12XD512
Tach Output
GPIO
Function Switch
Accelerometer
Input Capture
Input Capture
A/D Converter
GPIO
GPIO
PWM
Internal Outputs
GPIO
SPI
Serial
Wifi SoC
Processor Interface
Motorcycle Interface
Switching Power Supply
Fonera Internals
Placement Routing
PCB on top of Fonera
Fonera on Motorcycle
(Cas)
• Microcontroller - For things Linux won't do well
o Real-time data capture peripheral for Linux
 Input capture timers
 Timer interrupts
 Pulse width modulation
 High precision, high accuracy timing
 GPIO
 Serial host communication
o Motorcycle management
 Output data to tachometer dial
 Spedometer output
 Indicator lights
(Cas)
• Freescale HS12XA256 as Real-Time subsystem
• Real-time event scheduler
o Interrupt-driven Sampling
o Arbitrary periodic events
o Timestamping to GPS UTC +- 1ms
• Foreground process
o Binary serial communication with Fonera
o Update outputs to motorcycle (tach, speedo, indicator
light)
(Nick)
• A parametric periodic scheduler was used for many
of the repetitive tasks on the 6812.
(Nick)
• GPS
o determines absolute position at 1hz
• Accelerometer (not implemented)
o measures acceleration at higher frequencies
(Glen)
• Sockets are file descriptors -> file descriptors for
everything!
 Network Connections (sockets)
 log files (.txt)
 serial port( /dev/ttyS0)
• Standard structs for data serialization:
typedef struct _velData{
char tag;
char dummy;
unsigned short time_stamp;
unsigned short velocity;
}velDataType;
case vel_tag:
tag=((velDataType*)buf)->tag;
time_stamp = ((velDataType*)buf)->time_stamp;
data1= ((velDataType*)buf)->velocity;
sprintf(output,"%c,%d,%d,\n",tag,time_stamp,data1);
break;
(Glen)
• iPhone
• Used Sockets for
network
communication
(Joe)
• Post Processing with Python
• Presentation with Excel
• Presentation with Google Maps
• Bandwidth limitations
o Atheros SoC(Fonera) couldn't process large
amounts of data.
o 9S12 lost serial data when sending large number
of samples.
• Log more types of data
o We are only logging a subset of what we planned
• Increase sampling rates
o Optimize communication protocol
o Decrease Bootup Time
o Add more bugs (features)
o Integrate Data Post-Processing to iPhone
Work Breakdown
 Lev – Hardware/Motorcycle interfacing, Drivers
 Glen – iPhone SW, Comms
 Nick – Microcontroller SW (Task Scheduler, GPS)
 Cas – Microcontroller SW (Comms, Drivers)
 Joe – Data Processing
uP debugger