This code looks very much like my mouse code for mobile devices.
Try
joystickloc = joystick.getY()
if moved == False:
if joystickloc != joystickrec:
moved = True
thisExp.addData('Moved',round(t*1000)) # reaction time for movement
yMove = joystickloc-joystickrec # Check whether joystick moved on Y dimension
# Increase or decrease sizeChange variable
# depending on direction of movement
# e.g., make smaller if pushing away
if yMove > 0:
sizeChange1 -= .0066
sizeChange2 -= .01
elif yMove < 0:
sizeChange1 += .0066
sizeChange2 += .01
P.S. What’s the difference between joystick.device.getY() and joystick.getY() ?