Build a Privacy-First LLM Smart Home on Raspberry Pi 5
Introduction
Run LLMs locally on Raspberry Pi 5 for Edge AI
Set up software dependencies on Raspberry Pi 5 for Ollama and LLMs
Test Raspberry Pi 5 GPIO pins for smart home devices
Build and Run a Smart Home Assistant on Raspberry Pi 5 with LLMs
Next Steps

  Log an issue

  Fork and edit

  Discuss on Discord

Overview

The next step is to test the GPIO functionality. In this section, you configure an LED light to simulate a smart home device.

Verify GPIO setup on Raspberry Pi 5

Gather your electronic components. Connect the anode (long leg) of an LED in series with a 220Ω resistor to GPIO 17 (physical pin 11). Connect the cathode (short leg) to a ground (GND) pin.

See the image below for the full setup:

Image Alt Text:Raspberry Pi connected to a breadboard with a green LED and jumper wires alt-textRaspberry Pi connected to a breadboard with a green LED and jumper wires

Create a Python script named testgpio.py:

    

        
        
cd $HOME/smart-home
vim testgpio.py

Add the following code to the file:

    

        
        
#!/usr/bin/env python3
import time
from gpiozero import Device, LED
from gpiozero.pins.lgpio import LGPIOFactory

# Set lgpio backend for Raspberry Pi 5
Device.pin_factory = LGPIOFactory()

# Set up GPIO pin 17
pin1 = LED(17)

try:
    while True:
        pin1.toggle()  # Switch pin 17 state
        time.sleep(2)  # Wait 2 seconds
except KeyboardInterrupt:  # Ctrl+C pressed
    pin1.close()  # Clean up pin 17

Run the script:

    

        
        
python testgpio.py

The LED should blink every two seconds. If you observe this behavior, your GPIO setup works correctly.

Troubleshooting

If you run into issues with the hardware setup, check the following:

  • Fix missing dependencies with:
        

        
        
sudo apt-get install -f
  • If you encounter GPIO permission issues, run Python scripts with sudo or add your user to the gpio group. Don’t forget to log out for the changes to take effect:
        

        
        
sudo usermod -a -G gpio $USER
  • Double-check wiring and pin numbers using the Raspberry Pi 5 pinout diagram
  • Ensure proper LED and resistor connections
  • Verify GPIO enablement in raspi-config if needed
  • Use a high-quality power supply

With GPIO pins working, you can now move on to the next section to interact with devices using language models and the user interface.

Back
Next