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When the Rubber Hits the Road: Make Your Computer Talk to Your Car
- 1. When the Rubber Hits the Road: Making Your Computer Talk to Your Car Gary “Chunky Ks” Briggs <chunky@icculus.org>
- 2. Slides Overview Me OBDGPSLogger ELM327 and OBDII OBDSim Demo
- 3. Me Grew up & Studied in England Offered job in LA doing random Linux stuff Which ended up being print drivers for 6 years Now I work at a research nonprofit in Santa Monica Mostly simulation and modeling Really, this slide is so I have somewhere to put this pic --->
- 4. OBDGPSLogger Genesis Late 2009, I bought a car with an OBDII port That's mighty tempting Idealist requirements: Linux, OSX. Windows maybe Log data No GUI. RasberryPi, SheevaPlug... Log GPS as well as OBDII Make pretty pictures
- 5. OBDGPSLogger Now http://icculus.org/obdgpslogger “It does exactly what it says on the tin. It logs OBDII and GPS data on Linux, OSX and others” Mostly C, bits of C++ Open Source Logs to SQLite Hokey GUI
- 6. OBDGPSLogger in Google Earth
- 7. OBDGPSLogger, Still... Reads only Mode $01 PIDs Magically just works Except I haven't patched in support for current gpsd Google Earth output There's a live version, too Simple analysis stuff Works with my bike...
- 8. ELM327 and OBDII Originally invented at Elm Electronics, http://elmelectronics.com/obdic.html#ELM327 Most of the high-quality manufacturers implement their own chip firmware The ELM327 datasheet taught me most of what I know
- 9. ELM327 and OBDII, AT commands Standard text-based serial protocol I use PuTTY on Windows, screen(1) on Linux ELM327 commands might look suspiciously familiar to older members of the audience ATZ for reset ATE0/1 to turn echo on or off Scantool.net have an additional “ST” command set
- 10. ELM327 and OBDII, Getting Data In short: > 01 0D 41 0D 1F > “Show me mode $01, PID $0D” [vehicle speed] 41 => 0x40 | 0x01 0x40 = success, 0x01 = requested mode 0D => requested PID
- 11. OBDSim Genesis Got bored of walking out to car with my laptop Went looking for ELM327 & OBDII simulator Idealist requirements: Command-line OBDGPSLogger log playback Actually honors ELM327 commands Multiple ECUs Multi protocol support
- 12. OBDSim Now http://icculus.org/obdgpslogger/obdsim.html Pluggable data generators Works with all OBDII tools I've tried In the same source as OBDGPSLogger Has way more users than OBDGPSLogger Native Windows [MSYS] using com0com
- 13. OBDSim Supported AT commands ATAT{0,1,2} – Adaptive timing Cvdddd – Calibrate battery voltage ATD{0,1} – Display data bytes RV – Request battery voltage ATL{0,1} – Linefeed ATD – Reset defaults ATH{0,1} – Headers ATDP – Describe protocol ATS{0,1} – Space separators ATDPN – Describe protocol by number ATE{0,1} – Command echo ATI – Request device version id ATSP[A]{0-9,A-C} – Set protocol ATZ – Reset device ATST{n} – Set timeout ATWS – Warm start reset @1, @2, @3 – Device identifier stuff EXIT – Exit OBDSim
- 14. OBDSim Demo Launch on Linux, use “-c” to attach screen(1): obdsim -c ATZ, total reset ATE{0,1}, ATS{0,1}, ATL{0,1} As a developer, you'll turn them all off For keyboard experimenting, turn them all on ATI, @1, @2 for identifying device Couple simple data requests [010D vss, 010C rpm] ATH1, ATSP7 [CAN 29-bit 500], ATSP1 [J1850]