# stanleyhuangyc/ArduinoOBD

OBD-II library and sketches for Arduino

Repository: https://github.com/stanleyhuangyc/ArduinoOBD
Canonical: https://ross.abutalabs.com/products/arduinoobd
Homepage: http://freematics.com
Language: C++
License Family: other
Last push: 2024-02-14T09:56:48+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4910, "days_push": 931, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1106, forks 513 (observed 2026-08-28T04:03:36.515836+00:00)

## What it is
An open-source Arduino library and collection of sketches for accessing vehicle OBD-II data via Freematics OBD-II adapter hardware. It provides easy PID-based access to engine and vehicle metrics, plus example data logger projects with OLED/TFT displays and GPS.

## Use cases
- read engine RPM and coolant temperature from a car with Arduino
- build an OBD-II data logger for my vehicle
- log vehicle speed and GPS data to an SD card
- make a DIY digital gauge or HUD for my car
- query OBD-II PIDs over UART or I2C from an embedded device
- build a vehicle tracking or telematics prototype

## When to choose
- you use Freematics OBD-II adapter hardware with Arduino or ESP32
- you want a simple PID-based API for car diagnostics on embedded platforms
- you are building a DIY vehicle data logger, gauge, or telematics device

## When to avoid
- you need to talk to a car's ECU from a PC or phone without Arduino
- you want generic CAN bus tooling rather than OBD-II PID access
- you need a license-permitted codebase, as the repo has no explicit license

## Facets
- artifact type: library
- maturity: maintenance
- function: sdk, developer-tools, data-visualization
- domain: embedded-systems, hardware, iot
- platform: embedded, iot, cpp
- tags: obd-ii, vehicle-telemetry, arduino-library, car-diagnostics, data-logging, gps-logging, automotive

## Member repositories
- stanleyhuangyc/ArduinoOBD (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:36.515836+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:44:16.214873+00:00, confidence not recorded.
  - readme: https://github.com/stanleyhuangyc/ArduinoOBD (fetched 2026-08-28T04:03:36.515836+00:00, sha c651765632c3)
  - homepage: http://freematics.com (fetched 2026-08-29T12:47:45.144976+00:00, sha 6b7389c61c5d)
  - site_page: https://freematics.com/about.html (fetched 2026-08-29T12:47:45.154220+00:00, sha d385b38b5ab9)
  - site_page: https://blog.freematics.com/2025/us-import-tariff-prepaid (fetched 2026-08-29T12:47:45.156114+00:00, sha b22c12c5e4c8)
- Data as of 2026-08-30T08:39:29.467469+00:00.