Syncing a TTL with grating series

[LordKelv]

¡Hola BonVision crew!

I followed these instructions to make a series of flashing gratings. Here's the Bonsai Rx code for it: gratings.zip. Here's a screenshot of the workflow as well.

I would like for an Arduino to send a TTL pulse as the grating is showed, to sync it with an ephys rig.

I cannot figure out where to insert the digital output module to have it flag every single time a grating is showed (once every second for 5 minutes).

I will also cross post this issue on the Bonsai Rx github, in case its more of a general issue that can be solved over there.

Many thanks,
Kelvin