Define the envelope, topic namespace and OBD-II signal registry

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013kj58Jugkic783b8ZrtTVZ
2026-09-05 12:54:14 +09:00
commit 8f490aba8e
8 changed files with 317 additions and 0 deletions
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+{
+  "$comment": "Single source for signal identity. Topic name and envelope unit are both derived from these entries and are never authored separately. source=obd2 is standardised; source=z27ag is reverse-engineered and lives in the DBC.",
+  "signals": {
+    "engine_rpm": {
+      "unit": "rpm",
+      "type": "number",
+      "source": "obd2",
+      "description": "Engine speed",
+      "range": [
+        0,
+        8000
+      ]
+    },
+    "vehicle_speed_kph": {
+      "unit": "kph",
+      "type": "number",
+      "source": "obd2",
+      "description": "Road speed",
+      "range": [
+        0,
+        255
+      ]
+    },
+    "coolant_temp_c": {
+      "unit": "celsius",
+      "type": "number",
+      "source": "obd2",
+      "description": "Engine coolant temperature",
+      "range": [
+        -40,
+        215
+      ]
+    },
+    "intake_air_temp_c": {
+      "unit": "celsius",
+      "type": "number",
+      "source": "obd2",
+      "description": "Intake air temperature",
+      "range": [
+        -40,
+        215
+      ]
+    },
+    "throttle_pct": {
+      "unit": "percent",
+      "type": "number",
+      "source": "obd2",
+      "description": "Throttle position",
+      "range": [
+        0,
+        100
+      ]
+    },
+    "engine_load_pct": {
+      "unit": "percent",
+      "type": "number",
+      "source": "obd2",
+      "description": "Calculated engine load",
+      "range": [
+        0,
+        100
+      ]
+    },
+    "fuel_level_pct": {
+      "unit": "percent",
+      "type": "number",
+      "source": "obd2",
+      "description": "Fuel tank level",
+      "range": [
+        0,
+        100
+      ]
+    },
+    "intake_pressure_kpa": {
+      "unit": "kpa",
+      "type": "number",
+      "source": "obd2",
+      "description": "Intake manifold absolute pressure",
+      "range": [
+        0,
+        255
+      ]
+    },
+    "maf_gps": {
+      "unit": "g/s",
+      "type": "number",
+      "source": "obd2",
+      "description": "Mass air flow rate",
+      "range": [
+        0,
+        656
+      ]
+    }
+  }
+}