Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Supported by

[open] Sending triggers for EEG through serial port

edited June 2013 in OpenSesame

Hi,

I have been trying to set up my OpenSesame experiment to run from my laptop, with an EEG system. I want to send triggers to the EEG machine via a (USB converted) serial port, and had previously been using an inline script for sending through a parallel port (copied from the forum). So far, I had some help to make the changes for sending via the serial port, but am still having some issues. Firstly, I do not know how to open and close the serial port appropriately. I have included some inline script at the beginning of the experiment, as follows:

import serial
global ser
ser = serial.Serial('COM1', 19200)

try:
from ctypes import windll
global io
io = windll.dlportio # requires dlportio.dll !!!
except:
print 'The parallel port couldnt be opened'

Then, for sending triggers, I have included this inline script just after stimulus presentation:

global io
global ser

trigger = self.get("triggerstart")

try:
io.DlPortWritePortUchar(port, trigger)
except:
print 'Failed to send trigger!'

ser.write(trigger)
self.sleep(80)
ser.write(0)

I am presenting a series of images in short succession (hopefully for 80ms each), and have therefore used "sleep" here. The triggers are defined in the loop, in the variable "triggerstart". Right now, the inline script does seem to be sending the triggers, but a problem is that it seems to be sending ASCII codes, instead of the integers that I have defined in "triggerstart". There also seems to be some additional trigger codes coming on the EEG recording that I cannot see where, and if (unintentionally), I defined them, or where they are coming from.

Is there something I am doing wrong in the inline script?
How I should open and close the port properly?
How I can change the trigger codes to be the integers I defined, instead of the ASCII codes that I am currently getting?

Many thanks!

Elliot.

Comments

  • edited 1:39PM

    here is the script again, for easier reading:

    1st part, at beginning of experiment:

    import serial
    global ser
    ser = serial.Serial('COM1', 19200)
    
    try:
        from ctypes import windll
        global io
        io = windll.dlportio # requires dlportio.dll !!!
    except:
        print 'The parallel port couldnt be opened'
    

    2nd part, after stimulus presentation:

    global io
    global ser
    
    trigger = self.get("triggerstart")
    
    try:
        io.DlPortWritePortUchar(port, trigger)
    except:
        print 'Failed to send trigger!'
    
    
    ser.write(trigger)
    self.sleep(80)
    ser.write(0)
    
  • edited 1:39PM

    Following code is working for me:

    # 1st part
    import serial
    exp.serial_port = serial.Serial('COM1')
    # 2nd part during stimulation
    exp.serial_port.write(chr(1))
    # 3 in the end to close port
    exp.serial_port.close()
    

    hope it helps

  • edited 1:39PM

    Great! Thanks a lot sviter

Sign In or Register to comment.

agen judi bola , sportbook, casino, togel, number game, singapore, tangkas, basket, slot, poker, dominoqq, agen bola. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 50.000 ,- bonus cashback hingga 10% , diskon togel hingga 66% bisa bermain di android dan IOS kapanpun dan dimana pun. poker , bandarq , aduq, domino qq , dominobet. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 10.000 ,- bonus turnover 0.5% dan bonus referral 20%. Bonus - bonus yang dihadirkan bisa terbilang cukup tinggi dan memuaskan, anda hanya perlu memasang pada situs yang memberikan bursa pasaran terbaik yaitu http://45.77.173.118/ Bola168. Situs penyedia segala jenis permainan poker online kini semakin banyak ditemukan di Internet, salah satunya TahunQQ merupakan situs Agen Judi Domino66 Dan BandarQ Terpercaya yang mampu memberikan banyak provit bagi bettornya. Permainan Yang Di Sediakan Dewi365 Juga sangat banyak Dan menarik dan Peluang untuk memenangkan Taruhan Judi online ini juga sangat mudah . Mainkan Segera Taruhan Sportbook anda bersama Agen Judi Bola Bersama Dewi365 Kemenangan Anda Berapa pun akan Terbayarkan. Tersedia 9 macam permainan seru yang bisa kamu mainkan hanya di dalam 1 ID saja. Permainan seru yang tersedia seperti Poker, Domino QQ Dan juga BandarQ Online. Semuanya tersedia lengkap hanya di ABGQQ. Situs ABGQQ sangat mudah dimenangkan, kamu juga akan mendapatkan mega bonus dan setiap pemain berhak mendapatkan cashback mingguan. ABGQQ juga telah diakui sebagai Bandar Domino Online yang menjamin sistem FAIR PLAY disetiap permainan yang bisa dimainkan dengan deposit minimal hanya Rp.25.000. DEWI365 adalah Bandar Judi Bola Terpercaya & resmi dan terpercaya di indonesia. Situs judi bola ini menyediakan fasilitas bagi anda untuk dapat bermain memainkan permainan judi bola. Didalam situs ini memiliki berbagai permainan taruhan bola terlengkap seperti Sbobet, yang membuat DEWI365 menjadi situs judi bola terbaik dan terpercaya di Indonesia. Tentunya sebagai situs yang bertugas sebagai Bandar Poker Online pastinya akan berusaha untuk menjaga semua informasi dan keamanan yang terdapat di POKERQQ13. Kotakqq adalah situs Judi Poker Online Terpercayayang menyediakan 9 jenis permainan sakong online, dominoqq, domino99, bandarq, bandar ceme, aduq, poker online, bandar poker, balak66, perang baccarat, dan capsa susun. Dengan minimal deposit withdraw 15.000 Anda sudah bisa memainkan semua permaina pkv games di situs kami. Jackpot besar,Win rate tinggi, Fair play, PKV Games