Usually included with the module, but some circuits use an external earpiece or computer microphone.
Once a match is found, the module sends a specific Command ID (e.g., "1" for "Lights On") over the TX pin to the Arduino, which then triggers a relay or LED. 4. Setup and Training Voice Recognition System Circuit Diagram
The microphone picks up analog sound waves and converts them into electrical signals. Usually included with the module, but some circuits
Note: Pins 2 and 3 are often used with the SoftwareSerial library to keep the main hardware serial free for debugging. 3. How the System Works Usually included with the module
LEDs, relays (for high-power appliances), or a buzzer to confirm commands.