When you open Arduino App Lab, it automatically looks for any Arduino UNO Q boards connected through USB or available on your Wi-Fi network. Learn what to do if your board is not detected.

In this article:

• If your board is not detected via USB
• If your board is not detected on the network

If your board is not detected via USB

Try again after each step:

1. Disconnect and reconnect your board
2. Check board connections

1. Disconnect and reconnect your board

1. Disconnect and reconnect your board to reset its power.
2. Verify that at least one LED on your board lights on.
3. Wait for the Arduino UNO Q to fully boot up. At first, the LED matrix will display a swirling animation the shape of the Arduino logo. Once the board has finished booting, the LED matrix will instead display a heartbeat animation.
4. Check for any system notifications that may prompt you to grant USB device permissions, and allow them if they appear.

2. Check board connections

A common reason for a board not being detected is an issue with the USB connection. Follow the instructions below to ensure a proper setup:

• Use a Data USB Cable: Connect your board with a data USB cable, not a charging-only cable.
• Test the USB Cable: Confirm the cable is working by testing it with another device or trying a different cable.
• Connect directly: Connect the board directly to your computer instead of through a USB hub.
• Try a Different USB Port: If the board is still not detected, try a different USB port on your computer.
• Disconnect jumper cables: Remove any jumper cables connected to the board’s pins, as they may interfere with detection.

Some USB accessories are not compatible with Arduino UNO Q:

• Arduino UNO Q is not compatible with Apple USB-C hubs.
• Arduino UNO Q may not be detected when connected to USB-A ports on some USB hubs.

If your board is not detected on the network

Try again after each step:

1. Restart your board
2. Check your Wi-Fi configuration
3. Allow mdns-discovery (Windows)

1. Restart your board

1. Disconnect and reconnect UNO Q from its power supply.
2. Verify that at least one LED on your board lights on.
3. Wait for the Arduino UNO Q to fully boot up. At first, the LED matrix will display a swirling animation the shape of the Arduino logo. Once the board has finished booting, the LED matrix will instead display a heartbeat animation.

2. Check your Wi-Fi configuration

1. Ensure that your Wi-Fi router or access point is turned on and accessible.
2. Ensure that your computer and your UNO Q board are connected to the same Wi-Fi network.
3. Verify that your UNO Q board has the correct Wi-Fi name and password in Single-Board Computer mode.

3. Allow mdns-discovery (Windows)

Network Mode relies on local network discovery (mDNS) to automatically find boards on the same network.

• When launching Arduino App Lab for the first time, you may receive a prompt from Windows Defender (or other security software) regarding mdns-discovery.exe. You must allow this access for the board to be discovered. If you declined the prompt, you can manually allow mdns-discovery through Windows Firewall.
• Some network configurations such as guest Wi-Fi, corporate networks, VPNs, or strict firewall rules may prevent automatic discovery, even if the board is connected to Wi-Fi. If the board still does not appear, ensure that your firewall allows traffic on UDP port 5353, which is required for mDNS discovery.