Turning off digital outputs when stopping Bonsai workflow

[KL-Turner]

Hi everyone. The way that I am currently using Bonsai is to start and stop the workflow via the green triangle / red square at the top left on the screen. I'm using the start of bonsai to trigger another program that is doing most of the primary data collection, and am using bonsai to time some external stimuli. The problem I am having is that all of these digital pins from Bonsai remain HIGH if I happen to stop the program when in the middle of the stimulus loop. Is there a convenient / programmatic way to set all digital outputs to LOW when the workflow is stopped using the red square? Alternatively, is there a different way I should be stopping the program? I am [significantly more] familiar with LabVIEW and there's several ways of achieving this, some better practice than others, but I am having trouble finding an equivalent to any of them. Thank you

[banchan86]

Hmm unfortunately I do not know of a better way of stopping the program. I have also faced the same issue as you and have used these 2 workarounds but they may not fit your needs:

1. Resetting the pins at the beginning of the program (Boolean -> DigitalOutput should just fire once).
2. Having a second reset branch triggered by a KeyDown operator (KeyDown -> Boolean -> DigitalOutput).

Other than those, I think the most programmatic way is to wrap up the stimulus logic and have a post experiment reset.

[bruno-f-cruz]

As with any programming language interacting with hardware, you should always strive to set the device's initial state and ensure that the final state is predictable. In Bonsai, this can be achieved by sending something when the workflow starts and ends. For instance:

The first Timer is set to start 1 second after the workflow begins;
The second timer is set to start 5 seconds after the workflow begins. After the second timer ticks, the device state will be set to False, and the workflow will close since the incoming sequence is completed by the Take(1).

Hope it helps!