Arduino Voice-Controlled Light Switch

Project Overview

This project utilizes the Arduino Nano 33 BLE Sense microcontroller to create a voice-controlled light switch. The built-in microphone captures audio signals, and a pretrained word detection model identifies the words "Yes" and "No." The LED light is switched on when "Yes" is detected and off when "No" is heard.

Goals and Objectives

Explore machine learning applications using Arduino Nano 33 BLE Sense.
Implement voice recognition on microcontrollers.
Test the microphone capabilities of the Arduino Nano board for real-world applications.
Debug and modify in-built libraries and code.
Deploy the Micro Speech application to the Arduino Nano 33 BLE Sense.

Hardware and Software Required

Arduino Nano 33 BLE Sense board
Micro USB cable for connecting the Arduino board to a desktop machine.
Arduino IDE for programming the board.

Procedure

Use the Arduino IDE to connect the microphone and deploy the Micro Speech application to the microcontroller.
Install the Arduino_TensorFlowLite-2.4.0-ALPHA-precompiled library and select the micro_speech example.
Modify the code in arduino_command_responder.cpp to implement the desired functions.

Code Modification Example

// ... (Previous code)

void RespondToCommand(tflite::ErrorReporter* error_reporter,
    int32_t current_time, const char* found_command,
    uint8_t score, bool is_new_command) {
    static bool is_initialized = false;
    if (!is_initialized) {
        pinMode(LED_BUILTIN, OUTPUT);
        pinMode(LEDG, OUTPUT);
        digitalWrite(LED_BUILTIN, LOW);
        digitalWrite(LEDG, HIGH);
        is_initialized = true;
    }
    static int certainty = 220;
    if (is_new_command) {
        error_reporter->Report("Heard %s (%d) @%dms", found_command, score,
            current_time);

        if (found_command[0] == 'y') {
            digitalWrite(LED_BUILTIN, HIGH);
            digitalWrite(LEDG, LOW); // turn on LED
        }

        if (found_command[0] == 'n') {
            digitalWrite(LED_BUILTIN, LOW);
            digitalWrite(LEDG, HIGH); // turn off LED
        }
    }
}

// ... (Remaining code)