So green and blue represent your digital representation of the two types of triggers? Corresponding to the normal and oddball case? Looking at the scale of your scope, the green and blue do not look l

But i would suggest that one checks at the end, when the system is "ready", whether there is any induced "trigger" waveform on your EEG channels of interest. simply by plotting you

re: induced capacitive / inductive coupling of trigger signal into EEG channels.

For a trigger - you need to find your "time stamp of interest". For the "square wave" example i gave, a simple derivative and search of the positive deviations of the slope gives y

AGAIN, I recommend you will find it easier to just generate a DIGITAL trigger signal from the GPIO output of your Arduino sound generator. Using the analog output will be much harder in terms of the s

You need to define carefully the "trigger" input you want to put for your own use (eg a simple "on" signal of 100ms length, voltage height you decide) and how you interpret it (eg

To be honest, your best approach might be instead to use digital read, and modify your PIC24 / Arduino code to output a digital value at the time of your trigger event. That would also allow you to us

On D11 external trigger is connected. It is ranging some value 200 to 900 on Analog ReadOn. I am confused ... What does the ranges meaning ; And which value will be my event marker ? Do u have any csv

Rafia, what do you mean by: "But for my own trigger, do I have to upload any file to my board and then start to measure ? I meant to say what are the steps ? Do I need to use arduino ? Upload to

I am going to use external signal as I mentioned earlier. Not doing any more mess, I need to clear one thing: For using external trigger , I just need to follow https://docs.openbci.com/docs/02Cyton/C

Well, when I bought this that time which firmware version was, I am not sure. But by mistake I uploaded v3. I just followed the procedure and uploaded succesfully. And connected external trigger a

You do not need to change the Cyton firmware. The default firmware allows external trigger via the digital or analog input pins on the PIC32. Please just stick with the defaultboard firmware.

For external trigger use, Arduino (1.8.10)firmware is not uploading the defaultboard skectch.

I have connected External trigger(17) to cyton board as described in the pdf. Pin d17 reading 0 all the time and D18 all the time 1( I haven't connected D18). I think I have to edit /upload/? arduino

Rafia, please clarify your comment, I don't understand what you are asking. The audio signals you are using as external trigger signal(s), indeed do get converted from analog form into digital. By eit

There are two ways to connect an external trigger to the Cyton. You can use a two resistors to make a voltage divider, this will reduce the audio level into microvolts, for example + or - 50 microvolt

If this is two subjects and you want an approximate synchronization, you could possibly use one of the GPIO output pins on one Cyton, connected over to the Aux channel (there are 3 of them) on the oth

Rafia, how are you deriving your timing measurements (from stimulus moment until your peak response?) Are you using an external trigger?

You can also use HTML syntax mixed in with your Markdown. Such as the 'pre' tag for specifying pre-formatted / indented text. This appears to trigger the line numbers, but might avoid the keyword high

If we can, would a Macbook Pro 2015 (2.7 GHz Intel Core i5, 16GB RAM, SSD HD) be able to do FFT on both signals efficiently and leave me enough 'power' to synthesise/trigger sounds? I guess, I might j