client

Client

Use this code to send images (or video) to the Pi and show it on the LED table. Code is written in Python 3. For the send_img.py and send_video.py you need to have OpenCV installed. If you are using NixOS you can use the default.nix by invoking nix-shell in the client directory.

The server listens on UDP port 1337 for Open Pixel Control messages. See the link for more information. Channel is ignored, and a maximum of 15x15 LEDs can be controlled.

Command 1 can be used to set a number of pixels individually. This commands expects data to be a multiple of 5 bytes. Each 5 bytes form a set_pixel_color command: (./rand.py uses this)

• byte 0: x (0-14)
• byte 1: y (0-14)
• byte 2: b (blue, 0-255)
• byte 3: g (green, 0-255)
• byte 4: r (red, 0-255)

After 5 minutes of inactivity (no UDP packet’s received) the LEDs are turned off.

Usage

The sample scripts connect to the hostname led-table. You should configure this host in your /etc/hosts file, or set the IP address in ./base.py.

rand.py

Sets a random pixel to a random color multiple times a second.

python rand.py

send_img.py

Render an image file and send it to the table.

python send_img.py <image_filename>

send_video.py

Captures an image from your webcam and sends it to the table.

python send_video.py

Instead of the webcam image, you can also uncomment the line in the top of the file to play a video to the table:

# cap = cv2.VideoCapture(2)
cap = cv2.VideoCapture('/home/jos/Videos/test.mp4')