Table of Contents
A simple way to test GPIO-triggered signage behavior in Yodeck
What This App Does
This demo app is a basic HTML App that reacts visually to a Raspberry Pi GPIO input signal.
Specifically:
- When a switch connected to GPIO pin 4 is turned ON, the app shows a banner/message.
- When the input is OFF, the message disappears.
It’s a “hello world” of GPIO-based signage — perfect for understanding how content can change based on real-world signals.
Why We Built This
We built this demo app to help:
- Test GPIO wiring and behavior
- Show a proof of concept to clients or team members
- Provide a starting point for more advanced apps
How It Works
- First, set up the pin configuration (
localhost:9999/gpio/config) - The app uses Yodeck’s internal local API (
localhost:9999/gpio/io) to poll the GPIO pin every 1–2 seconds. - It checks the state of GPIO 4.
- The default state is configured to be OFF, if no circuit is connected to GPIO 4.
- If the value is
1, it shows content. If0, it hides it.
How to Use This Demo
- Download and Upload the ZIP file as a custom HTML App.
- Assign it to a screen
- Enable GPIO Input in the screen’s Interactivity tab
- Connect a simple button to GPIO 4 and GND
- Watch the screen respond in real time!
What This App Proves
✅ GPIO integration is working
✅ The app can react to real-time physical input
✅ You can now build your own logic for more complex behaviors
What This App Does Not Do
- It doesn’t support multiple inputs
- It doesn’t dynamically pull data or content
- It’s not built for production use — just testing and learning