Environmental light conditions
In order for the sensor to function, the space in which the sensor is installed needs to have sufficient light. This can be either
natural sunlight or artificial light. Typically any level of lighting you usually see in public spaces such as stores or museums is
more than enough for the sensor to function properly and stable.
In case of natural sunlight, the light intensity can fluctuate highly during the day. In these cases, it is important that no light can
reach the sensor when the object is placed back. Therefore we recommend the following:
• Use a non-translucent material for the top panel
• Or, add a non-translucent shaft in the cut-out when using a translucent material for the top panel
• Make sure the object which is picked-up or placed back is non-translucent
In environments with stable light conditions, it is possible (to some extend) to use a translucent top panel or translucent
object. However in these cases it might be necessary to calibrate the sensor.
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PRODUCT MANUAL | XZ LIGHT SENSOR
In most installations, the default factory calibration of the light sensor will work perfectly. However when working with
translucent materials, it might be necessary to calibrate the sensor. Calibrating the sensor is done utilizing X-talk settings. All
available settings for the light sensor are listed on page 5 and 6. Below, the calibration procedure is provided. Before starting
calibration, make sure the sensor is installed in the same way as it will be during operation. If either the setup or environment
changes, the sensor may need to be calibrated again.
Measure raw light values
1. Set the sensor to "Raw light values" via setting 4. The command to do so is
X001S[4:2]
.
2. Place the object on the sensor. Write down the value of the incoming API command .
For example X001A[30]
. *
3. Pick-up the object from the sensor. Write down the value of the incoming API command .
For example X001A[120]
. *
* In case both values are very low (e.g. 0 and 14) go to step A at the bottom of this page.
* In case both values are very high (e.g. 231 and 255) go to step B at the bottom of this page.
Adjust trigger values
4. Calculate the centre value of the raw light values measured in step 2 and 3.
For example (30 + 120) / 2 = 75
.
5.
Adjust the "place-back" threshold via setting 11. Set the threshold to the calculated centre value, minus a small buffer
(e.g. 5). In this
example, 75-5=70.
The settings command would therefore be
X001S[11:70]
.
6.
Adjust the "pick-up" threshold via setting 12. Set the threshold to the calculated centre value, plus a small buffer (e.g. 5).
In this
example, 75+5=80
. The settings command would therefore be
X001S[12:80].
Test pick-up and place-back detection
7. Set the sensor back to Pick-up/Place-back detection via setting 4. The command to do so is
X001S[4:1]
.
8. Place the object on the sensor. The API output should be
X001A[0]
.
If this is not the case, redo step 1-9
9. Pick-up the object from the sensor. The API output should be
X001A[3]
.
If this is not the case, redo step 1-9
Calibration is now done.
Optional: Adjust the sensor sensitivity
A. In case step 2 and 3 resulted in low raw light values, increase the sensitivity via setting 18. The default value is 50. We
recommend increasing with steps of 50. The first try would therefore be
X001S[18:100]
. Now repeat step 2 and 3.
B. In case step 2 and 3 resulted in high raw light values, decrease the sensitivity via setting 18. The default value is 50. We
recommend decreasing with steps of 10. The first try would therefore be
X001S[18:40]
. Now repeat step 2 and 3.
4.3 Manual calibration procedure
