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Biamp Cornerstone

How to use a GPIO as Input

You can use one or more of the IO's as an Input in order to trigger any sequence or event in Biamp Project Designer. It might be an external button or switch, which enables an event in the controller, like combining two rooms and locking buttons in the secondary room.

An input can trigger in two different ways, high or low. 

  • Input trigger low: < 1VDC
  • Input trigger high: > 4VDC

In the schematic below, you can see that the controller accepts voltages up to 24 volts and a short to ground.

How to use a GPIO as an input 1.png

The schematic above is the inside and outside of the input circuitry. In many cases you will need a pull-up resistor to not have a floating pin (input) because a floating pin is susceptible for electromagnetic influence and therefore you might get unwanted behavior on the input.

Watch this wikipedia article if you wish to know more about using a pull-up resistor

In the Systems page of Project Designer you assign one of the IO's as an Input as shown below:


Then go to the Feedback section and give the input a function as shown here:



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