Monitor Your Car from the CloudMonitor Your Car from the CloudDIY Telematics and the Internet of Things

Tom Gersic, Salesforce.com

Director, Mobile Services Delivery

@tomgersic

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Tom GersicTom Gersic

Director, Mobile Services Delivery

@tomgersic

Director, Mobile Services Delivery

@tomgersic

“You just can’t work on cars yourself these days because they’re all computerized.”

“I know more about pneumatic engine control systems than I do about computers”

The MIL (Malfunction Indicator Lamp)

• a.k.a “Check Engine Light”

• 2 Stages in cars since 1996 Model Year• Steady

• Flashing

P0171 and P0174 -- “System too Lean”

Bad O2 sensor?

Clogged fuel filter?

Vacuum leak?

Watery gas?

Plugged injectors?

Leak in the intake hose?

Sensors Galore

CAN Bus

OBD-II

• Required by law since 1996

• Within 2 feet of steering wheel

• 16 Pin connector

Real Time Data

So I got to thinking…

ELM327

Arduino

OBD-II TTL Adapter

Red: Vcc (+5V)Green: GroundYellow: RxBlue: Tx

TTL UART

UART: Universal Asynchronous Receiver and Transmitter

TTL: Transistor to Transistor Logic

ArduinoOBD

https://github.com/stanleyhuangyc/ArduinoOBD/

Beaglebone Black

Raspberry Pi

OBD-II Modes• $01. Show current data

• $02. Show freeze frame data

• $03. Show stored Diagnostic Trouble Codes

• $04. Clear Diagnostic Trouble Codes and stored values

• $05. Test results, oxygen sensor monitoring (non CAN only)

• $06. Test results, other component/system monitoring (Test results, oxygen sensor monitoring for CAN

only)

• $07. Show pending Diagnostic Trouble Codes (detected during current or last driving cycle)

• $08. Control operation of on-board component/system

• $09. Request vehicle information

• $0A. Permanent DTC's (Cleared DTC's)

Anybody remember the Hayes Modem Command Set?

Commands tgersic-ltm:dev tgersic$ screen /dev/tty.OBDII-LCASPP 115200>ATI (Print the ID)ELM327 v1.5

>ATZ (restart the device)ok>ATL1 (turn linefeeds on)ok>ATH1 (turn headers on)ok>ATS1 (turn spaces on)ok>ATSP0 (set protocol to Auto)ok>03 (get stored trouble codes)87 F1 12 43 04 44 00 00 00 00 15

43 is a response for a mode 03 query

Commands tgersic-ltm:dev tgersic$ screen /dev/tty.OBDII-LCASPP 115200>ATI (Print the ID)ELM327 v1.5

>010C (“01” is mode 01 for realtime data. “0C” is for RPM.84 F1 12 41 0C 0A EC CA

41 is a response for a mode 03 query0C is the command it’s responding to

0x0AEC is 2796 quarter RPMs, so 699 RPM (idling)

Screen Commands

OBD-II Logging

Heroku Upload Script

github.com/tomgersic/obd2pi -- obd.js

github.com/tomgersic/obd2pi -- obdsync.js

github.com/tomgersic/obd2server

http://[SOMEDOMAINHERE.COM]/log/{ obddata: { mode: '41', pid: '04', name: 'load_pct', value: 10.9375 },vin: 'JF1BJ673XPH968228',localdatetime: Sun Nov 10 2013 17:23:10 GMT+0000 (UTC),_id: 160 }

Heroku Mongo DB

Cases!

Tom GersicTom Gersic

Director, Mobile Services Delivery@tomgersic

@tomgersic