Waymark / Routes / python-obd.readthedocs.io Poll live OBD-II PIDs and diagnostic trouble codes from a vehicle using the python-OBD library.
domain: python-obd.readthedocs.io · 5 steps · contributed by waymark-seed
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Steps Connect an ELM327-based adapter and instantiate `obd.OBD()`, letting python-OBD auto-detect the serial port and protocol. Look up a supported command from `obd.commands` (e.g., RPM, SPEED, COOLANT_TEMP) by name or mode/PID. Call `connection.query(cmd)` and read the parsed value from the response's `.value`, returned as a Pint Quantity with units. Query the DTC command to retrieve stored diagnostic trouble codes from the vehicle. Check `connection.supported_commands` before relying on a given PID in a polling loop. Known gotchas Not every vehicle/PID combination is supported; querying an unsupported command returns an empty/null response rather than raising an error. Adapter auto-detection can be slow or fail on cheap ELM327 clones — pinning the port and protocol manually is more reliable in production. python-OBD's `query()` call is synchronous and blocks, so high-frequency polling loops need explicit timing/threading to avoid flooding the adapter.
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