Virtual Input¶

Overview¶

A Virtual Input is a value you set from the datalogger over USB. The
datalogger presents a set of sliders; each Virtual Input is one slider you can
drag to set its value live. Use it to inject a value for testing and tuning —
exercising logic that consumes an input without the real sensor connected.

Prerequisites¶

• The datalogger connected over USB to move the slider.

Add it in the app¶

1. Add a new input and choose Virtual Input as the type.
2. Give it a clear alias (e.g. Test Setpoint).
3. That's it — the value is driven from the datalogger slider.

Settings reference¶

This input has no type-specific settings — its value is set from the datalogger
slider over USB. See Common settings below.

Common settings¶

Virtual Input also uses the shared setting — alias. See
Common IO Settings.

Example — test setpoint¶

1. Type Virtual Input, alias Test Setpoint.
2. Reference Test Setpoint wherever you would normally use a measured input — for
   example as a term in a Compare Input or
   Math Divide Input.
3. In the datalogger, drag the Test Setpoint slider to different values to
   exercise the logic that consumes it.

Troubleshooting¶

• Value never changes: the datalogger isn't connected over USB, or the slider
  hasn't been moved.
• Other IO don't see it: check they reference the correct alias.

Related¶

• Constant Value Input — a fixed value that is not
  written at run time.
• System Input — an internal value produced by the controller.