> 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-e/daq-e-user-manual.md).

# DAQ-E User Manual

The DAQ-E is an IP67 waterproof, radiometrically calibrated Ethernet spectroradiometer, built for permanent outdoor installations. It records the ambient light spectrum from **340 – 1010 nm** as **135 measurements** (one every 5 nm) in absolute irradiance units (**W/m²·nm**), streaming to the network at up to **10 Hz**.

<figure><img src="/files/FdvyMlJTQqSLLon6GX5q" alt=""><figcaption><p>The DAQ-E: sensor end (left) and the waterproof Ethernet cable gland (right)</p></figcaption></figure>

A single Ethernet cable carries both power and data using **Power over Ethernet (PoE)** — there is no battery to charge and no memory card to download. This makes the DAQ-E well suited to rooftop and field stations, long-term environmental monitoring, and real-time reflectance measurements with [LATTICE cameras](https://www.mapir.camera/pages/multispectral-cameras).

The DAQ-E contains the same radiometrically calibrated light sensor as the [DAQ-U](/daq/daq-u/daq-u-user-manual.md) (USB-C) and [DAQ-M](/daq/daq-m/readme.md) (Bluetooth). All three speak the same protocol and produce the same `.daq` data file — the DAQ-E is the networked, waterproof, permanently-installed variant.

## How It Works

The DAQ-E connects to a PoE-capable network. Once powered, it appears on the local network and streams to Chloros (or your own software) over Ethernet. It advertises itself over mDNS so Chloros can discover it automatically, and it can broadcast to multiple consumers at once or stream to a single client. See [Network Setup](/daq/daq-e/network-setup.md) for addressing, discovery, and streaming modes.

Because the DAQ-E and MAPIR LATTICE cameras can share a common clock, spectral measurements can be aligned to individual camera frames. See [Time Synchronization](/daq/daq-e/time-synchronization.md).

<figure><img src="/files/iFDkCTdkTlXE7ZqmPFkC" alt=""><figcaption><p>The DAQ-E on a tripod, measuring plant-canopy lighting</p></figcaption></figure>

## Radiometric Calibration

Every DAQ-E ships with a unique, per-unit radiometric calibration certificate ([view an example](https://cdn.shopify.com/s/files/1/0878/4732/files/daq-e_example_calibration_certificate.pdf?v=1783039610)) that is stored onboard the device. Chloros reads that calibration and applies it to every measurement, so the sensor produces absolute, repeatable results and can operate without an internet connection. After the factory calibration the DAQ-E never needs to be recalibrated.

## Caps

Like the DAQ-U, the DAQ-E accepts snap-on caps that change the light path: the **Sunshine** cosine-corrector cap for ambient / downwelling irradiance (the default assumed by Chloros), and **15° / 45° / 90°** field-of-view caps for measuring reflected light from a target. The bare sensor remains IP67 waterproof and is used for low-light environments. See [Caps & Mounting](/daq/daq-e/caps-and-mounting.md).

## Capturing Data

{% content-ref url="/pages/rflDiGDz2YW3AmFFscKz" %}
[Capturing Light Sensor Data](/daq/daq-e/capturing-light-sensor-data.md)
{% endcontent-ref %}

## Specifications

| Specification                     | Details                                                   |
| --------------------------------- | --------------------------------------------------------- |
| Dimensions                        | 160 x 57 x 57 mm (L x W x H)                              |
| Weight                            | 165.48 g (169.02 g with Sunshine cap)                     |
| Ingress Protection                | IP67 waterproof                                           |
| Operating Temperature             | 0 °C – 60 °C                                              |
| Spectrometer Calibration          | Radiometric (W/m²·nm)                                     |
| Calibration Certificate           | Per-unit PDF (stored onboard, downloaded via Chloros)     |
| Onboard Calibration Storage       | Yes — calibration + certificate stored on device          |
| Wavelength Range                  | 340 – 1010 nm                                             |
| Number of Wavelength Measurements | 135                                                       |
| Wavelength Measurement Width      | 5 nm                                                      |
| Measurement Power Range           | 20 – 150,000 Lux                                          |
| Signal to Noise Ratio             | 250:1 @ max. power & average of 40                        |
| Dynamic Range                     | >1000:1                                                   |
| Linearity                         | 99%                                                       |
| Integration Time                  | Auto or Manual (4 ms – 500 ms)                            |
| Streaming Rate (maximum)          | \~10 Hz                                                   |
| Power                             | Power over Ethernet (PoE) only — no internal battery      |
| Memory                            | None (streams over Ethernet)                              |
| Interface                         | Ethernet (IPv4), field-serviceable waterproof cable gland |
| Software                          | Chloros (Windows, Linux)                                  |

## In the Box

* 1x DAQ-E spectroradiometer
* 1x Radiometric calibration certificate (digital — stored onboard, downloaded via Chloros)

Caps, Ethernet cables, and PoE equipment (injector or switch) are sold separately.