Data Sheet

Copyright © Terabee 2018
4.3 Interface for visual signalization
Tower Evo provides an interface to control an intelligent LED light source compatible with
WS2812B serial communication protocol. It allows you to drive up to four RGB LEDs through
a single wire provided that the LEDs sink current is kept within the power budget indicated
in the manual (ref. Section 2.3).
Three levels of signalization are provided to discriminate three different ranges (set with a
default value during manufacturing) as shown in the table below:
Detection
Distance
Color
No obstacle in range
Out of range
None
Obstacle detected in the range
>4m
Green
Obstacle detected in the range
2m to 4m
Orange
Close obstacle
0.5 to 2m
Red
New values can be programmed through the UART interface, offering the possibility of
customizing the LED triggering thresholds within the valid range of the Tower. These values
can span from 0.5m to 8m in 0.1m increments. The upper value of the threshold range
cannot be higher than the lower value of the adjacent threshold range. Overlaps between
threshold ranges are checked by the Tower and, if found, the Tower responds with a ‘Nack’
(Not acknowledged) signal. Once the thresholds system is operating, if all sensors are
detecting “out of range”, then all LEDs will be off. Whenever a threshold is reached by one of
the sensors, the LEDs will switch to the appropriate color and stay continuously ‘on’ until a
different threshold is activated.
Important Note: The LED signalization feature only provides an indicative proximity status
based on the Tower Evo sensor closest to an obstacle or hazard and is provided as a useful
aid rather than a guaranteed fail-safe solution. You use this feature at your own risk.
Below 1 meter, some target surfaces (transparent or with low light reflectivity) can potentially
introduce false readings which could mean that the LED signalization is not based on the
closest sensor to an obstacle. However, this will only affect the LED signalization and not the
distance sensing capability.
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Terabee Website:
90 Rue Henri Fabre Technical support:
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