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All cars manufactured since 1996 have an OBD-II diagnostic interface. Join us to learn how to expose this data using a Heroku app and Force.com APIs, explore the data available, and be introduced to DIY products like the Arduino, Raspberry Pi, and Beagle Bone. We'll finish by creating an automatic support-request and case-handling system.
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Monitor Your Car from the Cloud
DIY Telematics and the Internet of Things
Tom Gersic, Salesforce.com
Director, Mobile Services Delivery
@tomgersic
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Tom Gersic
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
CAN Bus
OBD-II
Required by law since 1996
Within 2 feet of steering wheel
16 Pin connector
P0171 and P0174 -- “System too Lean”
Bad O2 sensor?
Clogged fuel filter?
Vacuum leak?
Watery gas?
Plugged injectors?
Leak in the intake hose?
Real Time Data
So I got to thinking…
ELM327
Arduino
OBD-II TTL Adapter
Red: Vcc (+5V)
Green: Ground
Yellow: Rx
Blue: Tx
TTL UART
UART: Universal Asynchronous Receiver and Transmitter
TTL: Transistor to Transistor Logic
Commands tgersic-ltm:dev tgersic$ screen /dev/tty.OBDII-LCASPP 115200
>ATI (Print the ID)
ELM327 v2.0
>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 v2.0
>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 query
0C is the command it’s responding to
0x0AEC is 2796 quarter RPMs, so 699 RPM (idling)
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)
ArduinoOBD
https://github.com/stanleyhuangyc/ArduinoOBD/
Simple MongoDB logger in Heroku
Heroku to Salesforce
Tom Gersic
Director, Mobile Services Delivery
@tomgersic
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