vizia-fydp/raspberry-pi

Code that runs on the raspberry pi. Handles GPIO for buttons, piezoelectric buzzer, and camera. Also makes API calls to the server to perform AI inference tasks.

raspberry-pi

Code that runs on the raspberry pi. Handles GPIO for buttons, piezoelectric buzzer, and camera. Also makes API calls to the server to perform AI inference tasks.

Device Setup

First, download Raspberry Pi OS. We recommend the 32-bit Raspberry Pi OS Lite for best performance.

Use balenaEtcher to flash the OS onto a 32GB microSD card.

Navigate to the newly congifured boot drive (remove and reinsert microSD if the boot drive is not visible). Run the following command to enable ssh:

touch ssh

This will allow you to remotely log-in and control the Raspberry Pi.

Then to allow the Raspberry Pi to connect to a Wi-Fi network, create a new file and edit it with the following command:

vim wpa_supplicant.conf

And copy the following as the contents of the file:

country=CA # Your 2-digit country code
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
network={
    ssid="YOUR_NETWORK_NAME"
    psk="YOUR_PASSWORD"
    key_mgmt=WPA-PSK
}

Connect the Raspberry Pi to a monitor and keyboard for a one-time setup. And connect it to power. Log-in with the default credentials (assuming a fresh Raspberry Pi OS install). Run the following command to allow cloning of the raspberry-pi repository:

sudo apt-get install git

Then, run the following to get the IP address of the Raspberry Pi on the current Wi-Fi network (should be the same that you used in wpa_supplicant.conf):

hostname -I

This IP address is the one you will use to ssh to the Raspberry Pi.

Remotely Connecting to the Raspberry Pi

Use the following command to connect to the Raspberry Pi:

ssh pi@<IP address>

Now you can clone the raspberry-pi repository however you like! We recommend generating an SSH key and adding it to your GitHub account.

Module Setup

Most of the libraries needed should come pre-installed with the OS, with the exception of the following:

• opencv
• picamera
• RPi.GPIO

Install opencv with:

sudo apt install python3-opencv

Install picamera with:

sudo -H apt install python3-picamera

Then enable the camera by entering:

sudo raspi-config

And navigate to Interface Options and select Legacy Camera to enable it.

If you are missing RPi.GPIO, install with:

sudo apt install pigpio

Now reboot the Raspberry Pi by entering:

sudo shutdown -r now

Running

Before running, ensure the server is up and update SERVER_URL if necessary.

python3 main.py