finviz-frame
RPI 4 based finviz stockmap frame.
Fetches stock map data from finviz and shows it on your raspberry pi display. Finviz is awesome, subscribe to it!
Components
- Raspberry Pi 4: https://www.raspberrypi.org/products/raspberry-pi-4-model-b/
- Raspberry Pi Display: https://www.raspberrypi.org/products/raspberry-pi-touch-display/
- NeeGo display case: https://www.amazon.com/Raspberry-Screen-Monitor-Touchscreen-Display/dp/B081VT2CPW
Follow the NeeGo assembly instructions to put it all together.
Software
I used Pyxian SDK from Renetec: https://www.renetec.io/pages/easy-gui-development-for-raspberry-pi It allows one to develop RPi graphical apps with just HTML and Javascript. Great fit for this usecase.
- Download Pyxian from the URL above
- Flash it to the SD card
- Boot your RPI4 and configure WiFi from the Web UI
- Copy the files from this repo to the /home/pi/.inox/apps/ directory on your Raspberry Pi
- Install cacerts: sudo apt-get install ca-cacert
- Add update.sh script to the crontab so it runs periodically using crontab -e. This is what I used:
*/5 * * * * /home/pi/.inox/apps/finviz/update.sh - You should see the finviz app in the Installed Apps secton of the Pyxis UI. Start it from there.
- Enjoy!
Caveats
- The smallest map available from FinViz is 788 pixels. This is too big for the RPi display, so I had to scale down the page using the CSS "zoom" attribute. This prevents hover events from working correctly. This can probably be fixed by installing a custom event handler to scale the offsets back to what they are supposed to be.
- Finviz does not have an API, so the code fetches the finviz HTML page and parses it. This is likely break in the future if they change the format.
- The data gets updated by refreshing the page every 5 minutes. This causes a flicker every refresh.