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{{Infobox tsg
| name = Vertical Sync sensor
| image = sensorPic.jpg
| caption = Vertical Sync sensor
}}
{{Infobox tsg
{{Infobox tsg
| name = Seeed Studio XIAO SAMD21
| name = Seeed Studio XIAO SAMD21
}}
}}
The Vertical Sync sensor is used on a computer/laptop monitor for time accurate visual presentation. The sensor measures screen brightness. It generates a BITSI trigger to the com-port("A" = ON/light, "a" = OFF/noLight) when the amount of light is higher than the (customizable) threshold. This means that the exact onset of visual stimulus on screen can be marked. It can easily be attached with a pincher to the screen. The Vertical Sync sensor is connected to a computer with a usb connection.
The Vertical Sync sensor is used on a computer/laptop monitor for time accurate visual presentation. The sensor measures screen brightness. It generates a BITSI trigger to the com-port("A" = ON/light, "a" = OFF/noLight) when the amount of light is higher than the (customizable) threshold. This means that the onset of visual stimulus on screen can be marked. It can easily be attached with a pincher to the screen. The Vertical Sync sensor is connected to a computer with a usb connection, a serial port is emulated. You may want to read about [[presentation modes]] in order to decide how to use the sync sensor.
== BITSI Protocol ==
== BITSI Protocol ==
|}
|}
Meaning when light falls on the sensor, a capital A will be sent to the serial port. A lowercase 'a' will be sent when the signal is deactivated(no light).
===Output===
===Output===
=== Python/PsychoPy ===
=== Python/PsychoPy ===
<br/>'''Example using the Vertical Sync sensor in PsychoPy:'''
<br/>'''The basics using the Vertical Sync sensor in PsychoPy:'''
<syntaxhighlight lang="python" line>
# initialize treshold for OFF by sending a code
ser.write(b'1')
visual.Rect(win, .15, .25, pos=(-1, 1),fillColor="white", units="norm").draw()
win.flip()
# wait for a sync square
b = ser.read()
</syntaxhighlight>
<br/>'''Example script using the Vertical Sync sensor in PsychoPy:'''
<syntaxhighlight lang="python" line>
<syntaxhighlight lang="python" line>