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description: This page describes the DAQ-A
---

# DAQ-A User Manual

The DAQ-A is an aerodynamic PPK data logger containing GNSS (GPS) and IMU position sensors, with a user-accessible micro SD card for saving the data log. There is a USB port for power input, an RGB LED status button and two Survey3 camera connection ports.

Power (5V) is supplied to the DAQ-A depending on how you have it connected. You can EITHER supply power input to the DAQ-A micro USB port OR into either of the Survey3 camera ports. Do not send power into BOTH the micro USB and the Survey3 camera port(s).

Once power is connected the DAQ-A will boot up. It can take several minutes from when the power is first connected to when the button LED turns red, so please be patient. The system is usable when the button LED is green. The GNSS inside the DAQ-A has 2 LEDs located on the top, a faint green/yellow LED for power and a flashing blue LED once it has a satellite lock. Each Survey3 camera will beep 6 times once the GNSS has a lock.

{% hint style="success" %}
The DAQ-A is recording when the button LED is green
{% endhint %}

## Adjusting DAQ-A Settings

You can adjust the DAQ-A device settings by [editing the micro SD configuration file](adjusting-configuration-file).

## To Start/Stop Image Capture

By default the auto-start image capture parameter will be off, so triggering must be started manually. You can edit the [configuration file](adjusting-configuration-file) to turn auto-start on/off. The button can be clicked with a short press action to start the image capturing sequence. If the interval parameter is greater than 0, the trigger signal will be sent at the interval rate (in seconds). If the interval is 0 then one trigger will be sent per button click. When the image capturing interval is active the LED will pulse green. The interval value can be edited in the [configuration file](adjusting-configuration-file).

## To Start/Stop Data Logging

Performing a long button press (more than 5 seconds) will start or stop the data logging. The button LED will change from logging ON (GREEN) to logging OFF (RED) or vice versa when pressed and released.&#x20;

Prior to removing power to the DAQ-A you MUST disable logging, or there is a good chance the micro SD could become corrupted. This is because the micro SD card is constantly being written to when saving the sensor data. If the current log becomes corrupted there is nothing that can be done to repair it.

{% hint style="warning" %}
Always stop the data logging (red LED) before disconnecting power to the DAQ-A!
{% endhint %}

<div><figure><img src="https://385441496-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FkhnbM2shh9Z3FNqxObzO%2Fuploads%2F0Q3G6flNUSV06AhmQL9j%2Fdaq-a-sd_red.jpg?alt=media&#x26;token=0bcb1233-210a-40b0-b2c9-77ba1e9fe1a6" alt="" width="375"><figcaption><p>LED = RED: No Logging​</p></figcaption></figure> <figure><img src="https://385441496-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FkhnbM2shh9Z3FNqxObzO%2Fuploads%2FuZlaCOVD1iPOleRKckdq%2Fdaq-a-sd_green.jpg?alt=media&#x26;token=3b26ad7e-fa29-454f-8acf-ccceacba0722" alt="" width="375"><figcaption><p>LED = GREEN: Logging</p></figcaption></figure></div>
