OpenTag OpenTag3 User Manual

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Open Tag3 Manual
Overview
OpenTag3 records motion sensors at 50 Hz, and depth, temperature, light, and speed sensors at 1 Hz to
CSV files. Files are 1 hour long by default. There will be a short gap between files. OpenTag3 supports 32
GB or smaller microSD cards.
OpenTag3 is open source. Software is located at https://github.com/loggerhead-instruments/OpenTag3
• Accelerometer, Gyroscope, Magnetometer (MPU9250): 100 Hz
• Pressure/Temperature (MS5837 or Keller PA7LD): 1 Hz
• RGB light level (ISL29125): 1 Hz
• Burn wire release: controls a FET switch to ground which can be used to corrode a stainless steel
wire in seawater

OpenTag OpenTag3 Specifications

General

Brand	OpenTag
Model	OpenTag3
Category	Accessories
Language	English

Summary

Overview

Quick Start

Setting Time

Procedure for setting the device's internal clock using a setup.txt file.

Starting Record

Instructions for inserting the microSD card and initiating data recording.

Stopping Record

Steps to safely stop data recording and power down the device.

setup.txt Commands

Details on commands for the setup.txt file to configure device settings.

Charging

Power

Burn Wire

VHF

Depth Sensors and Maximum Depth

Sensor Calibration

Making a Recording for Gyroscope Calibration

Procedure for collecting data to calibrate gyroscope offsets.

Making a Recording for Magnetometer Offset Calibration

Procedure for collecting data to calibrate magnetometer offsets.

Sensor Calculations

Revision History