This guide shows how to light an LED automatically when audio reaches a defined threshold.

Wire the LED to the GPIO Output on the GPIO Card
(Follow the wiring reference for correct polarity and pin selection.)

Add the following blocks to your project:

• Audio Source

• Audio Signal to Control

• Control to Logic

• GPIO Output Card

Open the GPIO Output Card and assign the correct GPIO channel that the LED is connected to.

In the Audio Signal to Control module:

• Open Object Properties

• Adjust the threshold level where the LED should activate

This threshold determines the point at which audio is considered “active.”

Play audio and verify LED behavior:

• Audio above threshold → LED lights up

• Audio below threshold → LED turns off

This confirms that the LED is responding correctly to signal level.