OBD2 CAN Logger

Engine RPM

—

rpm

Speed

—

km/h

Throttle

—

Coolant Temp

—

°C

MAF

—

g/s

Short FT

—

Long FT

—

Intake MAP

—

kPa

O2 B1S1

—

Ign Advance

—

°BTDC

Frames/sec

fps

Total Frames

frames

0 frames SD: — Pause scroll Chrome / Edge required

Time (ms)	CAN ID	Ext	FD	DLC	Data (hex)	Decoded

Map Reconstruction — Engine Data

Maps are built live from OBD2 PID responses. Connect, start logging, and drive — plots populate in real time.

Throttle vs RPM

Short Fuel Trim vs RPM

Ignition Advance vs RPM

MAF vs RPM

Intake MAP vs RPM

Speed vs RPM (gear est.)

Captured Data Points

#	t (ms)	RPM	TPS%	STFT%	LTFT%	IGN°	MAF g/s	MAP kPa	Spd	ECT°C

📂 Drop .dbc file here
or click to browse

Loaded DBC

No DBC file loaded

Messages: 0 Signals: 0

Message	ID	Signal	Start	Len	Factor	Offset	Min	Max	Unit	Live Value

// Open a CSV log file from the SD card, or watch live frames on the Live Data tab

Device Configuration

CAN Bitrate Standard OBD2 uses 500 kbps. Some older cars: 250 kbps.

Session Name Prefix for log filenames on SD card

Log CSV Human-readable .csv on SD

Log Binary Compact .can binary on SD

Stream over Serial Send JSON frames to this web app

CAN ID Filter (hex, comma-sep) Leave blank to log all IDs

Device Status

Connect to device to read status…

SD Card Management

USB Storage Mode

Stops logging and mounts the SD card as a USB drive so you can browse, copy, or delete log files directly from your computer. The device disconnects from the web app — reconnect after ejecting the drive.

Format SD Card

⚠ Permanently erases ALL log files on the SD card and formats it as FAT32. This cannot be undone. Use this when the card is full or to start fresh.