Manual

LW20 / SF20 LiDAR sensor
Product manual
10. How to set up the alarms
The LW20 has two alarms, A and B, that be can used to warn when objects get too close. The alarm changes from a 0 state to a 1
state when an object is detected closer than the set distance. The alarms are updated every time a new distance measurement is
taken.
The alarm distances and hysteresis can be set using the “Laser” button found under the “Setup” tab. The alarms settings are
indicated on the graphic along side the distance measurement.
Figure 26 :: Setting the alarms to warn of nearby objects
The alarms can also be used in scanning mode when the LW20 is attached to a servo. In this case, the alarms become two
dimensional with distance and angle settings. Two dimensional alarms update at the ends of each sweep and remain in a fixed state
for the duration of the sweep, giving the host controller time to check the alarm status.
The two dimensional alarm settings can be found using the “Alarms” button under the “Setup” tab. The segment representing alarm
A is indicated in orange and alarm B is indicated in grey. The colored areas flash when an object is detected inside the alarm zone.
Figure 27:: Setting two dimensional alarms
You can use the position slider to check the activation of the alarms at different scanning angles.
11. Limitations
The maximum range can be reached on white painted walls that have high reflectivity and a large surface area. Surfaces that are
darker in color or smaller in size can only be measured at shorter ranges.
LW20 / SF20 LiDAR - Product manual - Revision 9 | of | © LightWare Optoelectronics (Pty) Ltd, 2018 | www.lightware.co.za 21 28