Dragino LLDS40 User Manual

2.3.2! DS18B20 Temperature sensor
This is optional, user can connect external DS18B20 sensor to the
+3.3v, 1-wire and GND
pin . and this
field will report the temperature.
Example
:
If payload is: 0105H:! (0105 & FC00 == 0), temp = 0105H /10 = 26.1 degree
If payload is: FF3FH :! (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.
2.3.3! Distance
Indicates the distance value measured by the LLDS40. The default unit is cm and the range is 0-4000.
Example
:
If the data you get from the register is 0x0B 0xEA, the distance between the sensor and the measured
object is 0BEA(H) = 3050 (D)/10 = 305cm.
2.3.4! Distance signal strength
Refers to the signal strength, the default output value will be between 0-65535. When the ranging gear is
fixed, the farther the ranging, the lower the signal strength.
In actual use, when the signal strength value Strength≤60, the measured value of Dist is considered
unreliable, and the default output is 4500. When the signal strength is greater than 60 and the actual
distance is and the actual distance is 45~60m, the output value of Dist is 4500. When the signal strength is
greater than 60 and the actual distance is more than 60m, there will be over-period data appearing as 0 or
other abnormal values.
Example
:
If payload is: 01D7(H)=471(D), distance signal strength=471, 471>100,471≠65535, the measured value of
Dist is considered credible.
Customers can judge whether they need to adjust the environment based on the signal strength.
1) When the sensor detects valid data:

Dragino LLDS40 Specifications

General

Brand	Dragino
Model	LLDS40
Category	Accessories
Language	English