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ChatGPT - Raspberry Pi

This project integrates voice input, large model response, and voice output functionalities using a Raspberry Pi 5. It employs the ReSpeaker Lite as the audio input and output device, enabling seamless interaction with ChatGPT and speech-to-text conversion services.

Hardware Required​

Getting Started​

Check the Getting started documentation to set up your Raspberry Pi first, connect your Pi to the network.

note

Make sure your python version is newer than python3.7.1.
To check the version:

python3 --version

Install Libraries​

sudo apt update
sudo apt install python3-pip python3-dev
sudo apt install portaudio19-dev
pip3 install pyaudio
pip3 install speechrecognition
pip3 install openai
pip3 install playsound
  • For Raspberry Pi 5, run the following command to configure ReSpeaker Lite:
pw-metadata -n settings 0 clock.force-rate 16000

For a permanent change, un-hash and edit default.clock.rate line in /etc/pipewire/pipewire.conf (copy it first from /usr/share/).

tip

Command to adjust the volume of ReSpeaker Lite:

alsamixer

Code​

This Python code implements a simple voice assistant that listens for a wake word, recognizes user voice commands, converts them to text, generates a response using GPT-4, and then converts the response to speech and plays it back.

The device first waits for the wake word, then listens for the user's command. Once the command is received, the program generates a response using GPT-4 and plays it back as speech. If it fails to recognize the command three times, it returns to listening for the wake word, you'll need to say the wake word again to initiate a new voice interaction session.

  • Step1: Configure API key
export OPENAI_API_KEY= 'your-api-key-here'
  • Step2: Create a new python file and enter the following code:
import speech_recognition as sr
from openai import OpenAI
from pathlib import Path
from pydub import AudioSegment
import os


client = OpenAI()

def text_to_speech(text):
    speech_file_path = Path(__file__).parent / "speech.mp3"
    response = client.audio.speech.create(
    model="tts-1",
    voice="alloy",
    input=text
    )

    response.stream_to_file(speech_file_path)
    audio = AudioSegment.from_mp3("speech.mp3")
    audio.export("speech.wav", format="wav")
    cmdline = 'aplay ' + " speech.wav" 
    os.system(cmdline)



# Initialize recognizer
recognizer = sr.Recognizer()
microphone = sr.Microphone()

# Define the wake word
WAKE_WORD = "hi"

def listen_for_wake_word():
    with microphone as source:
        recognizer.adjust_for_ambient_noise(source, duration=0.5)
        print("Listening for wake word...")
        
        while True:
            audio = recognizer.listen(source)
            # audio = recognizer.listen(source, timeout=5, phrase_time_limit=5)
            try:
                text = recognizer.recognize_google(audio).lower()
                if WAKE_WORD in text:
                    print(f"Wake word '{WAKE_WORD}' detected.")
                    text_to_speech("hi,what can i do for you?")
                    return True
            except sr.UnknownValueError:
                continue
            except sr.RequestError as e:
                print(f"Could not request results; {e}")
                continue

i=0
def listen_for_command():
    global i
    with microphone as source:
        print("Listening for command...")
        # audio = recognizer.listen(source)
        audio = recognizer.listen(source, timeout=5, phrase_time_limit=5)
        try:
            command = recognizer.recognize_google(audio)
            print(f"You said: {command}")
            i=0
            return command
        except sr.UnknownValueError:
            print("Could not understand the audio")
            i = i+1
        except sr.RequestError as e:
            print(f"Could not request results; {e}")
            i = i+1


def get_gpt_response(prompt):
    completion = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[
        {"role": "system", "content": "Your name is speaker, you can answer all kinds of questions for me"},
        {"role": "user", "content": prompt}
    ]
    )

    content_string = completion.choices[0].message.content
    paragraphs = content_string.split('\n\n')
    combined_content = ' '.join(paragraphs)
    return combined_content




def main():
    global i
    while 1:
        flag = listen_for_wake_word()
        while flag == True:
            user_input = listen_for_command()
            if i==3:
                flag = False
                i = 0
            if user_input:
                gpt_response = get_gpt_response(user_input)
                print(f"GPT says: {gpt_response}")
                text_to_speech(gpt_response)
                

if __name__ == "__main__":
    main()
  • Step3: Run the python file.
python openai.py

Now you are all set, try waking it up with Hi and talking to it!

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