> For the complete documentation index, see [llms.txt](https://mapir.gitbook.io/daq/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mapir.gitbook.io/daq/daq-a/survey3-camera-ports.md).

# Survey3 Camera Ports

You can connect either 1 or 2 Survey3 cameras to the DAQ-A. The ports are labeled 1 or 2.

Here is the pin-out for the camera ports:

<table data-full-width="false"><thead><tr><th width="170">Pin Number</th><th>Function</th></tr></thead><tbody><tr><td>1</td><td>Power Input/Output (5V)</td></tr><tr><td>2</td><td>Ground</td></tr><tr><td>3</td><td>GPS (UART)</td></tr><tr><td>4</td><td>Camera Trigger (PWM)</td></tr><tr><td>5</td><td>Camera Exposure Strobe (Relay)</td></tr><tr><td>6</td><td>Ground</td></tr></tbody></table>

<figure><img src="/files/k34tOJUwT8ZpFlg7u5pb" alt="" width="375"><figcaption><p>MAPIR DAQ-A: Survey3 Camera Ports</p></figcaption></figure>

The GNSS sensor data in the DAQ-A is sent via pin 3 to the Survey3 cameras to be saved in the captured image geolocation metadata.

Every time the camera captures an image it will send the exposure pulse on pin 5 to be logged by the DAQ-A. Depending on which camera it is, either 1 or 2, the exposure pulse will be logged separately. The exposure events in the DAQ-A log will be used in our image processing to perform PPK correction, which improves the image location data.