Cedrus Response Pad in Vizard

[Roy]

What's the differences between vizcedurus and vizxid modules in Vizard 7?

There are already some posts about Cedrus response pad, but a bit confusing how to use it as a response device in Vizard.
For example, what' the easy or suitable way to use the Cedrus pad as a response device like a general keyboard to get the response time and pressed key?

[Jeff]

I think vizxid is the more recent of the two modules. The following code has worked for other users with a Cedrus response pad. Does this work for you?

import viz
import viztask

viz.go()

#Connect to xid device
import vizxid
vizxid.open(18) #Default: port=1 , baudRate=115200

def TestReactionTime():

#Add instruction label
label = viz.addText('Press the spacebar to start the experiment\nWhen the red square turns green, press button 3 on the cedrus pad',viz.ORTHO)
label.alignment(viz.TEXT_CENTER_CENTER)
label.fontSize(24)
viz.link(viz.CenterCenter,label)

#Start expirement when spacebar is pressed
yield viztask.waitKeyDown(' ')

#Remove the label
label.remove()

#Add quad to screen
quad = viz.addTexQuad(viz.SCREEN)
quad.setPosition(0.5,0.5)
quad.setScale(4,4,4)

#Data for getting values from wait conditions
d = viz.Data()

while True:

#Set quad to red color
quad.color(viz.RED)

#Wait random amount of time
yield viztask.waitTime( vizmat.GetRandom(1.5,2.5) )

#Set quad color to green
quad.color(viz.GREEN)

#Wait for next frame to be drawn to screen
yield vizxid.waitDraw()

#Wait for button 3 on XID to be pressed
yield vizxid.waitButtonDown(3,d)

#Calculate reaction time
reactionTime = d.time
print('Reaction time:',reactionTime)

viztask.schedule( TestReactionTime() )