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 your input signal to GPIO 4 and make sure it has a common ground (GND) with the Raspberry Pi.
For a quick demonstration, you can use wiring to connect an on/off switch between a 3.3V GPIO pin and the GPIO 4.
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