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3dtof / voxelsdk

VoxelSDK - an SDK supporting TI's 3D Time of Flight cameras
BSD 3-Clause "New" or "Revised" License
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What's the function "tillum_calib" in conf file? #24

Closed Yorkland closed 9 years ago

Yorkland commented 9 years ago

I got different "tillum_calib" after the calibration of VoxelViewer. The value is 43 or 44 . What's the function of this item?

gadiyar commented 9 years ago

This is the temperature measured by the on-board temperature sensor placed near the illumination board. We have two temperature sensors: tsensor (near the sensor chip - on OPT8241, this is in the sensor chip) and tillum (external TMP103 placed near the illumination driver).

During temperature calibration, the values of these two temperature sensors are recorded and saved, along with the coefficients used for temperature compensation.

Please refer to section 7.3.8 (Calibration) in the OPT9221 datasheet (http://www.ti.com/lit/gpn/opt9221) for details on this and related parameters.

Yorkland commented 9 years ago

I got it, so there are 2 temperature parameters (tillum_calib & tsensor_calib) in conf. If I don't do temperature calibration temporarily, what's the default value I could set into?

gadiyar commented 9 years ago

If you don't do temperature calibration, the coeff_illum and coeff_sensor coefficients will be 0. So the tillum_calib and tsensor_calib values will have no effect.

Yorkland commented 9 years ago

OK, I will try it, thanks a lot.