I'm trying different appraoches for a software trigger but I also built the photoresistor to measure latency and jitter. 

I'm sure you are aware of this, the LSL marker streams are a way of recording external trigger events within the LSL framework.

These guys wrote a white paper, but use an external parallel port to CREATE a trigger signal channel,

LabStreamingLayer is intended provide such timing correlations. But in my opinion, the optical trigger is your surest bet. Do you understand the simple circuit I outlined? It would take less than an h

We don't know the precise analog voltages you will get, but you can determine that by experimentation. You should be able to distinguish the 'off' state of your LCD display trigger, from the 'on' stat

I'm working on a P300-based appilcation where data should be synced with the stimulus displayed on the screen. I can't use hardware triggers.I read the EEG data from the serial port and have a high pr

This requires to get some external digital trigger or analog signal and add it to the output stream. Both options are avialable for Cyton boards. And, as I understood from other discussions, with the

In EEG data collection, this is usually called "external trigger", where a button press or other event is recorded simultaneously with the EEG data.

It would be great if anyone would look and comment.I will update it later. I'm going to try to use the CMSIS library to do an fft and analyze the frequency components and trigger a beeper connected to

movement of the forefinger we use an external trigger on digital input D17. So, we see in the recorded data the input change from 0 to 1 if the finger pushes the trigger button. 

https://www.google.com/search?as_q=cyton+trigger&as_sitesearch=openbci.com

If you have external trigger circuitry connected to the Cyton/WiFi boards as shown here (http://openbci.com/forum/index.php?p=/discussion/1273/placing-triggers-in-data-with-button-press), it's possibl

Have you tried using shielded cable (2 conductors and a braided or foil shield) for the incoming analog signal? The proximity of the trigger cable to your EEG cables, may be causing capacitive or indu

(http://docs.openbci.com/Tutorials/06-External_Trigger_Cyton_Example).  Everything is working except the trigger data appears to be showing up in my other 16 channels as seen in this image. Once it t

Dear All,

The tutorials that mention receiving an external trigger, find it in one of the Aux channels.

Next, I tried to find the way to send an external trigger from python as you suggested, but couldn't.

light up green. This means the trigger is working and recording.

- I have to calculate ERP, so it is better to synchronize the timing of stimuli and EEG, and I want to send a trigger to OpenBCI. Is it possible? and how?

I would like to use the bpm to trigger events in another application via OSC or UDP