1x1-FRC Notes

This single button device sends data that is roughly proportional to the applied force on the button. Data are sent as:

• USB HID joystick data
• X-axis only
• Range: mid scale to 90% of full scale
• Raw range: 512 to 1023

The MR-compatible version of this device (HHSC-1x1-FRC) will have a variation in the full scale setting that is based on the auto-ranging feature of the optical interface units. The gains are set in steps of 2dB, which means that a gain setting that is one step higher will place the resting signal 1.25x higher and, consequently, the range will be 1.25x larger. For this reason most tasks will benefit from recording the full scale signal at the start, and then use that reading to scale subsequent force readings.

The trainer version of this device (OTR-1x1-FRC) does not automatically set its gain but is adjusted when built to produce a signal which is initially 90% of full scale. This should not change significantly over time.

How to read the output

Because the data are sent as joystick data, please check the Tethyx joystick page for some getting started pointers then the Grip Force user notes page for more, including a python example script.