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Overview This manual explains how to operate the Metrici RGB LED Display through its built-in browser-based configuration. The configuration page is accessible from any device connected to the same local network and allows you to manage display content, network settings, system updates, and integration with the Metrici web application.

Introduction

The Metrici RGB LED Display is a network-connected, full-colour LED matrix designed to show live operational data from a Metrici system — free parking spaces, vehicle speed, license plate numbers, weighbridge readings, platform assignments, directional arrows, or any custom text the system needs to broadcast. The unit runs an embedded configuration interface (documented in the rest of this manual) and is intended for permanent indoor or outdoor mounting.

Standard Models

Two standard formats are available, with custom sizes produced on request:

Custom sizes share the same housing, ingress rating, RGB capability, network connectivity and configuration interface as the standard range.

Hardware Highlights

Typical Applications

What This Manual Covers

This manual documents the embedded configuration interface that runs on the display itself, accessible from any device on the same network at port 3000. From there you can choose between API-driven content (live data from the Metrici Web Interface) and static text, configure per-line text/colour/font or polling settings, tune low-level panel parameters, manage network and credentials, and inspect logs and updates.

Configuration of the data sources themselves — Parking for LPR, Area Counter, Line Counter and Parking Place Detector — lives in the Metrici Web Interface manual; Section 8 – Web Application Integration of this document covers the codes and URLs you need to connect the two.

For full hardware specifications, dimensions and ordering options, see the Metrici LED Display product page on the Metrici website.

1. Getting Started

  1. Open a web browser (Chrome, Firefox, Edge, Safari, etc.) on any device that is connected to the same local network as the Metrici RGB Display.
  2. Enter the IP address that is shown on the physical display, or use the default address 192.168.100.10. The display listens on port 3000, so the full URL has the form http://<display-ip>:3000 (for example, http://192.168.100.40:3000). If you are unsure of the address, ask your system administrator.
  3. You will be presented with a Login screen — see Login. The default credentials are:
    • Username: metrici
    • Password: metrici
    Type them in and click Sign in.
Dashboard screenshot
Login
We recommend changing the default password immediately after the first login, to prevent unauthorised access to the display. Open the User page to set a new username and password. Before you do, please read the important note in Section 7 – User Page regarding password recovery.

2. Main Dashboard

Dashboard screenshot
Fig.1 Dashboard

After a successful login you are taken to the Dashboard, which gives you a quick overview of the device — see Fig.1 Dashboard.

Recent activity panel
Fig.2 Recent Activity
Note: The dashboard preview approximates font size — it does not load the exact glyph metrics from the matrix, so the on-screen rendering may differ slightly from the physical LED output.
Important: While the system is saving changes or rebooting, the page will dim and a spinner will appear. Wait until the spinner disappears before interacting again.

4. Configuration Page

The Configuration page is where you customise the behaviour of the matrix. It is divided into several sections. By default only the most common settings are shown. To reveal hidden, advanced options, tick the Show advanced config checkbox at the top of the page.

4.1 Display Source

At the top of the page, choose the source of the content that the LED matrix should show — see Fig.3 API Configuration:

4.2 API Settings (when API is selected)

API configuration screenshot
Fig.3 API Configuration
Note: All fields are validated. If a value is missing or malformed, an error message appears in red directly under the field.

4.3 Static Content (when STATIC is selected)

Static content configuration screenshot
Fig.4 Static Content Configuration

In static mode you can configure up to three lines of fixed text. Each line is independent and has its own settings — see Fig.4 Static:

Above the per-line configuration, two global controls are available:

4.4 Display Settings (Brightness)

Use the Brightness slider to make the matrix brighter or dimmer. The current percentage is shown to the right of the slider (e.g. 50%). This control is always visible regardless of the display source.

4.5 Advanced Display Settings

Advanced display settings screenshot
Fig.5 Advanced Display Settings

When the Show advanced config checkbox is ticked, additional low-level parameters become available. Internally, the display is driven by the open-source hzeller/rpi-rgb-led-matrix library, and each of the fields below corresponds directly to one of its command-line flags. The link is also exposed inside the interface as “For detailed information check the library docs” — refer to that page if you need the full background.

The values that ship with the device have been chosen to match the panels Metrici delivers; only change them if you are connecting a different panel or are troubleshooting a visual problem — see Fig.5 Advanced Display Settings.

Warning: Incorrect values in this section can cause the panel to render garbled output or stop refreshing entirely. Before changing anything, use Section 4.7 – Import / Export Configuration to export the current config.ini so you can roll back. Change one parameter at a time and observe the result on the dashboard preview before making further adjustments.

4.6 Network Settings

Network configuration screenshot
Fig.6 Network Configuration

This section lets you configure how the device connects to your network. The currently active IP address and MAC address are shown in the upper-right corner of the panel as quick-reference indicators. — see Fig.6 Network Settings.

When you change any network-related value and click Save Changes, a countdown dialog appears. After the countdown a new browser tab opens with the new address, so you can continue using the interface without manually locating the new IP.

4.7 Import / Export Configuration

Import Export Configuration screenshot
Fig.7 Import / Export Configuration

This panel lets you back up or replicate the entire display configuration as a single config.ini file. It is particularly useful when deploying several displays with identical settings.

Tip: After importing, review the loaded values (especially the network section) before saving, to avoid losing access to the display.

4.8 Saving, Discarding, Resetting & Rebooting

At the bottom of the Configuration page there are three buttons:

5. Logs Page

Logs page screenshot
Fig.8 System Logs

The Logs page displays a chronological list of system events. At the top, a green banner indicates whether the page is Connected to real-time logs.

6. Update Page

System update screenshot
Fig.9 System Update

From the Update page you can install newer versions of the Metrici Display software — see Fig.9 System Update.

Important: Do not power off the device or close the browser tab while the update is in progress. Wait until the device finishes rebooting.

7. User Page

User page screenshot
Fig.10 Update User

The User page lets you change the credentials of the currently logged-in account. The default credentials are metrici / metrici and we strongly recommend changing them after the first login. The form contains three fields — see Fig.10 Update User:

Click the blue Update User button to apply the changes. To end the current session at any time, click Logout in the top-right corner of the page.

Important – Save your new password in a safe place!
The password cannot be recovered or reset from the interface, and there is no “forgot password” option. If you lose it, the only way to regain access to the display is to send the unit back to Metrici for a factory reset. Write the new credentials down or store them in a password manager before logging out.
Tip: After changing the password you will be required to log in again with the new credentials.

8. Web Application Integration

When the display is configured with Display Source set to API, the content shown on the LED matrix is generated by a module of the Metrici web application (Parking for LPR, Area Counter, Line Counter or Parking Place Detector). For each module you have to do two things:

  1. In the web application, fill in the Display Text field with the codes that describe what should appear on the LED matrix.
  2. Copy the auto-generated URL from the web application and paste it into the API URL field of the display (see Section 4.2 – API Settings).

The Display Text uses two kinds of codes: colour codes (which start with # followed by a letter) and data codes (which start with # followed by the name of the value). The colour code applies to everything that follows it until the next colour code.

8.1 Colour Codes

The following colour codes are supported across all modules:

Important: A colour code is mandatory — without one, nothing will be displayed on the LED matrix.

A number from 1 to 9 may be appended to a data code to define how many characters are reserved for that value (for example, #COUNTER3 reserves three characters). If the rendered length exceeds the physical width of the panel, the line scrolls.

8.2 Parking Module for LPR

Parking for LPR web app settings
Fig.11 Parking for LPR – Display configuration

In the web application navigate to Parking for LPR → Settings, select the location and click Edit Parking Settings. We need to customize what we want to see in Display Text field — see Fig.11 Parking for LPR.

The data codes available for the Parking module are:

Example: #Y#TSPACES#Total Parking Spaces #R#BSPACES#Occupied Parking Spaces #G#FSPACES#Available Parking Spaces

The auto-generated URL has the form:

http://IP_OF_THIS_SERVER/io/lpr/location_display.php?id=1

Copy this URL into the API URL field on the display. The Parking Settings page also exposes URL to trigger when parking is full and URL to trigger when parking lots are available, which can be pointed to the display's HTTP endpoints (e.g. http://admin:metrici@192.168.100.10/red/on) to change the colour of an external indicator.

For full details refer to the Parking Module for LPR – Settings chapter of the Metrici Web Interface manual.

8.3 Area Counter

Area Counter web app settings
Fig.12 Area Counter – Edit Location

In the web application navigate to Area Counter → Settings → Locations & Cameras, select the location and click the blue Edit button. Fill in the Display Text field — see Fig.12 Area Counter.

The data codes available for the Area Counter module are:

Example: #YCapacity=#CAPACITY3 #RBusy=#COUNTER3 #GAvailable=#AVAILABLE3

The auto-generated URL has the form:

http://IP_OF_THIS_SERVER/io/ac/location_display.php?id=11

The same Display Text mechanism can also be applied at the Group level (a group is a collection of zones sharing a characteristic). For full details refer to the Area Counter – Settings chapter of the Metrici Web Interface manual.

8.4 Line Counter

Line Counter web app settings
Fig.13 Line Counter – Edit Zone

In the web application navigate to Line Counter → Settings, select the location and the zone you want to edit, then click Edit Zone. Fill in the Display Text field — see Fig.13 Line Counter.

The data codes available for the Line Counter module are:

Example: #RCOUNTER #COUNTER3 #GAVAILABLE #AVAILABLE3

The auto-generated URL has the form:

http://IP_OF_THIS_SERVER/io/lc/zone_display.php?id=17

For full details refer to the Line Counter – Settings chapter of the Metrici Web Interface manual.

8.5 Parking Place Detector

Parking Place Detector web app settings
Fig.14 Parking Place Detector – Edit Location

In the web application navigate to Parking Place Detector → Settings → Locations & Cameras, select the location and click the blue Edit button. Fill in the Display Text field.

The data codes available for the Parking Place Detector module are:

Example (each line on its own row, as shown in the screenshot above):

#GAvailable #FSPACES2
#ROccupied #BSPACES2
#VTotal #TSPACES2

The auto-generated URL has the form:

http://IP_OF_THIS_SERVER/io/ppd/location_display.php?id=1

The same Display Text mechanism can also be applied at the Group level. For full details refer to the Parking Place Detector – Settings chapter of the Metrici Web Interface manual.

8.6 Quick Checklist

  1. In the web application, fill in the Display Text field of the relevant module using colour codes and data codes.
  2. Copy the auto-generated URL from the same page.
  3. On the display, open Configuration, set Display Source to API, paste the URL into API URL, and set a sensible Poll Interval (typically 1 second).
  4. Click Save Changes. Verify on the Dashboard that the Currently on display preview shows the expected content and that the Dynamic Content field on the Configuration page reflects the API response.

9. General Tips & Troubleshooting

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