Problem sending SerialPort Triggers
Hi everyone,
I'm trying to build an ERP oddball experiment but I'm having trouble sending the triggers. Since I'm new to code, I've managed to collect information from the forum discussions and have used the following inline scripts:
#SerialPort_Open
import serial
exp.serial_port = serial.Serial('COM3')
#SerialPort_Send
exp.serial_port.write(chr(1))
#SerialPort_Close
exp.serial_port.close()
The EEG is being recorded with Biosemi ActiveTwo system and the ActiView software. Although the experiment run as expected, no trigger is sent. I've tried to move the SerialPort_Open inline script before the loop but the experiment crashes with the following error:
File "C:\Program Files (x86)\OpenSesame\lib\site-packages\serial\serialwin32.py", line 62, in open
raise SerialException("could not open port {!r}: {!r}".format(self.portstr, ctypes.WinError()))
SerialException: could not open port 'COM3': WindowsError(2, 'El sistema no puede encontrar el archivo especificado.')
I wonder if there may be some error in the python code or if I didn't insert the Inline scripts in the correct place. I've attached an image of a simplified version of the experiment so you can have a look at the structure.
Does anyone have any suggestions?
Thanks in advanced,
Jose
Comments
Hi,
I am running the same kind of experiment. I managed to see the triggers on the recording software with this method (the port is a serial port and I've found the address of the port in the Windows Device Manager).
First, I put this inline script at the very beginning of my experiment.
Then I put this inline script after each stimulus
After that, I put an inline script to reset the port to zero (for example at the end of the trial sequence).
Always write the code in the "Run" tab and not the Prepare tab. And that's it. It works for me, but I am very new to OpenSesame so I am not sure that this is the best solution to your problem !
Eva
Hi Eva,
Thanks for your answer. I have made some changes following your comments, however, triggers are still not sending. Attached a simplified version of the experiment just to try to solve this problem.
The inline scripts are as follows:
For SerialPort_Open
import serial exp.serial_port = serial.Serial('COM3') exp.cleanup_functions.append(exp.serial_port.close)For SerialPort_Send
For resetPort_to_0
For SerialPort_Close
The experiment doesn't crash, but it doesn't send triggers either. Does anyone has any clue how to get through this issue?
Could be an issue on the receiving end. I am not too familiar with BioSemi, but:
Like I said, total guesswork though. Maybe BioSemi support will be able to better assist you.