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OBD Mini Logger™

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DAWN Mini-Logger Video

OBD
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Overview

The DAWN OBD Mini Logger™ is a compact, low-cost data logger to acquire CAN bus data from cars and light trucks. The logger installation is simple since it snaps directly on the J1962 OBD connector. The logger is so small that it fits in the palm of your hand.

DAWN comes standard with a generic OBD-II database which defines almost 100 parameters according to the SAE J1979 standard; 40 being available on a typical car. The companion DawnEdit™ software determines which parameters are available on the vehicle to create a unique database for each vehicle model. The user can select which parameters are acquired. Also, the user can add custom messages and parameters in DawnEdit to acquire proprietary messages.

The OBD Mini Logger can simultaneously acquire four types of messages:

  1. Generic OBD-II – standard on all cars and light trucks after 1996 (mode $01) as defined by J1979
  2. Enhanced OBD – similar to a service scan tool database; specific to each OEM (mode $21 and $22)
  3. Normal messages – transmitted for normal vehicle operation; no request messages required (These can be any CAN format including J1939 and CANOpen)
  4. Direct Memory Reads (DMRs)- highly proprietary (mode $23); reads controllers’ memory

Acquiring Data Beyond Standard OBD-II Parameters…

Soft LED indicators show the logger status without distracting the driver. It has a real-time clock which the user can set to the local time zone. The Mini Logger includes a battery backup so the logger always knows the correct time.

The DAWN Mini-Logger Video demonstrates how to configure the logger and convert the message to scaled, engineering parameters.

Standard Parameters

List of OBD-II parameters

 

OBD Mini Logger Specifications

Protocols
ISO 15765-4 (CAN, 11-/29-bit, 250/500 kbps) Yes
SAE J1850 PWM & VPW Yes
ISO 9141-2 Yes
ISO 14230-4 (KWP) Yes

No. of Protocol Ports (Channels)

Three CAN channels (250, 500kbps, other)

Real-time PC data

Yes

RT Connections to PC

WiFi

Stand-alone Logger

Yes

Store Messages

Yes

On-board Storage

4GB internal storage. 32 GB option. How to estimate data size

Auto Start-up

Yes

LEDs for status

RGB

Operating system

Proprietary RTOS

GPS (NMEA 0183)

Option. Internal to Mini Logger.

Wireless (WiFi)

Option. Internal to Mini Logger.

Cellular modem

Option. Internal to Mini Logger.

Operating system

Proprietary RTOS

Real-time clock

Yes

Analog Inputs

Cabin Temperature Sensor

Option

3-axis MEMS Accelerometer

Option. +/-2.3 g. Resolution of .018g

Vehicle Battery Voltage

Option

Expansion

Optional ADAQ Mini

Environment

Size (inches)

Size (mm)

OBD Connector: 1.9W x 0.70H x 1.5L

48W x 18H x 38L

Supply Current:

80 mA. Up to 200mA with WiFi

Operating Temperature C

-40 to +70

Operating voltage

4 to 36V

Over/Under Voltage protection

100V including input capacitors to prevent a short circuit. Approved by several OEMs

Power Draw while sleeping

3 mA

Warranty

1 Year

 

Data Storage & Transfer

The OBD Mini Logger comes standard with 4GB internal storage (up to 32GB option). Manually transfer message files to a PC using USB. The oldest file is removed if the logger runs out of disk space. How to estimate data size

 

Automated Data Transfers with WiFi and Cellular

WiFi or cellular are options to automate the file transfers to a website. Files are removed from the logger after a successful transfer. If you prefer to use an HEM Data website to store and display data click here for a description of features and benefits. For details on the WiFi and cellular options click here.

GPS

GPS data is an option for the OBD Mini Logger. GPS Data syncs with vehicle data on conversion. Click here for details on GPS that is housed within the Mini Logger.

Stand-alone Data Logger or Real-Time Display

The DAWN OBD Mini Logger™ works as a stand-alone data logger for convenient data storage without a PC: just plug the logger into the OBD connector and it will start storing messages as soon as the ignition is turned on.

If you need real-time display of the data on a PC or smartphone, then you can also use the OBD Mini Logger as a pass-thru device. Contact HEM Data for details on real-time data with a PC, iPad or smartphone.

Analog Data

The ADAQ Mini acquires analog data directly from sensors. This includes K type thermocouples, various voltage ranges and current measurements. The ADAQ Mini works with the OBD and J1939 Mini Loggers. Click here for ADAQ details.

 

Hybrid Test Data

To learn about DAWN and hybrid test data see this page.

Future Enhancements

Check with HEM Data for availability for support of these future enhancements: Bluetooth, and smartphone.

 

Options

Options include:

 

Connectors

OBD Mini Logger J1962 Automotive Adapter

 

J1962 Pin J1962 Pin Description
1 Discretionary* (GMLAN SW CAN Line)
2 + line of SAE J1850
3 CAN2+,  (GMLAN MS CAN H),
4 Chassis/Case Ground
5 Signal Ground
6 CAN+,  GMLAN HS CAN H
7 K Line of ISO 9141-2
8 Discretionary*
9 Discretionary* (GM ALDL)
10 - line of SAE J1850
11 CAN2-,  (GMLAN MS CAN L), Short to ground
12 Discretionary*
13 Discretionary*
14 CAN-  (GMLAN HS CAN L), Short to ground
15 L line of ISO 9141-2
16 Unswitched Vehicle Battery Positive

 

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DAWN Mini-Logger Video

Have a question? Please see our FAQ.


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