The light sensor is available in two colors: black and white. Notches are molded in on three sides to allow for easy positioning on the screen.
The response and release times are dependent on the amount of light.
The light sensor is small, measuring only 8mm (W) by 20mm (L) including the wire’s strain relief.
For best performance, all the inputs connect to the microprocessor using interrupts. The resulting latency is under 5µs between an event occurring and being registered and timestamped by the system. Assuming no further signal filtering, the output will appear on the m-pod output pin in less than 200µs and sent to the USB port is less than 100µs. The delays between input and output are:
When StimTracker is generating event markers for more than one device:
The latency for sending an event code depends on the baud rate selected through the driver. At the recommended 115,000 baud rate, the three byte command needed for sending an event marker takes 0.36 milliseconds to transfer.
Once received, StimTracker processes the command and produces the output in less than 0.1 milliseconds.
There may be additional latencies introduced by the host computer, operating system, application, or a combination of the above, over which StimTracker has no control.
Both StimTracker models offer these advanced built-in features:
StimTracker uses a 9V power supply. Its plug has an OD of 5.5mm and ID of 2.1mm plug. It is center positive.
For StimTracker Duo and Quad, power consumption is 250mA. Each connected m-pod consumes an additional 50mA.
For Wireless StimTrigger, power consumption is 1,550mA.
All the firmware features described above are supported by our C++ library. Some are supported by our Python and Matlab libraries as well, and we can add support for other features upon request. All libraries are open source and on GitHub.
The raw commands that StimTracker and m-pod accept are fully described.
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