I am currently using a Biopac MP150 model in our lab.
I have been trying to send TTL Signals via matlab to the biopac equipment via parallel port of address 378.
The matlab codes seem to be fine, however, the biopac doesnt seem to respond to the ttl signal.
What I have done till now:
As for matlab, i have downloaded and installed lptwrite.m which is the required software to send ttl signals.
and, i have created a plot via AcqKnowledge software to view the signals obtained/responsive by biopac.
On the plot, when the PC is on, its on high(5V) constantly. However, when the command: lptwrite(888, 0), is applied to make it low(0V).
It still stays on high(5V) when it should become low(0V).
Apparently, I was using biopac to collect GSR data on a participant simultaneously.
The plots for the ttl signal and gsr were on the same screen and run live at the same time.
The GSR data was running fine while the ttl signal was consistent and unresponsive at 5V while the signals to alter the ttl codes were executed.
The matlab codes used are shown below:
lptwrite(888, 0); % to transmit a 0V signal, 888 is the address for 378 in decimal
WaitSecs(0.005); % waits for 5 milli seconds
lptwrite(888, 255); % to transmit a 5V signal
Ultimately, I would like to make biopac responsive to the matlab codes below so that it shows on the plot as per the codes mentioned above via AcqKnowledge Software.
The aim is to use ttl signals as a markers for paradigms.
Is there anyway that I could make this happen?
Thanks
I have been trying to send TTL Signals via matlab to the biopac equipment via parallel port of address 378.
The matlab codes seem to be fine, however, the biopac doesnt seem to respond to the ttl signal.
What I have done till now:
As for matlab, i have downloaded and installed lptwrite.m which is the required software to send ttl signals.
and, i have created a plot via AcqKnowledge software to view the signals obtained/responsive by biopac.
On the plot, when the PC is on, its on high(5V) constantly. However, when the command: lptwrite(888, 0), is applied to make it low(0V).
It still stays on high(5V) when it should become low(0V).
Apparently, I was using biopac to collect GSR data on a participant simultaneously.
The plots for the ttl signal and gsr were on the same screen and run live at the same time.
The GSR data was running fine while the ttl signal was consistent and unresponsive at 5V while the signals to alter the ttl codes were executed.
The matlab codes used are shown below:
lptwrite(888, 0); % to transmit a 0V signal, 888 is the address for 378 in decimal
WaitSecs(0.005); % waits for 5 milli seconds
lptwrite(888, 255); % to transmit a 5V signal
Ultimately, I would like to make biopac responsive to the matlab codes below so that it shows on the plot as per the codes mentioned above via AcqKnowledge Software.
The aim is to use ttl signals as a markers for paradigms.
Is there anyway that I could make this happen?
Thanks