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LSN50 LoRa Sensor Node User Manual 26 / 60
2.4.7 Distance Reading
Refer Ultrasonic Sensor section.
2.4.8 Ultrasonic Sensor
The LSN50 v1.5 firmware supports ultrasonic sensor (with AT+MOD=2) such as SEN0208
from DF-Robot. This Fundamental Principles of this sensor can be found at this link:
https://wiki.dfrobot.com/Weather_-
_proof_Ultrasonic_Sensor_with_Separate_Probe_SKU___SEN0208
The LSN50 detects the pulse width of the sensor and converts it to mm output. The accuracy
will be within 1 centimeter. The usable range (the distance between the ultrasonic probe
and the measured object) is between 24cm and 600cm.
The picture below shows the connection:
Connect to the LSN50 and run AT+MOD=2 to switch to ultrasonic mode (ULT).
The ultrasonic sensor uses the 8
th
and 9
th
byte for the measurement value.
Example:
Distance: Read:0C2D(Hex) = 3117(D) Value: 3117 mm=311.7 cm
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