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3. Advanced Guide
3.1 Operating principle of the Sigfox-Ready Ultrasonic level
sensor
3.1.1 Operating principle of the complete device
The Daviteq Sigfox-Ready Ultrasonic level sensor comprises 02 parts connected together:
- The Daviteq Sigfox-Ready wireless transmitter;
- The Daviteq Ultrasonic level transducer;
The Ultrasonic level transducer measures the average distance from the sensor surface to the waste surface in the
trash bin.
The Sigfox-Ready wireless transmitter is to read the distance value from the transducer and perform the scaling (A and
B values, during calibration). The scaled value will indicate the level of % level of waste in the trash bin.
Level = A x Distance + B
Where:
A: Constant A
B: Constant B
Note: the minimum distance that the transducer can detect is 3cm, it is called the blind zone of the sensor.
3.1.2 Operating principle of Ultrasonic level sensor ULA
To understand how the ULA ultrasonic level sensor can measure the distance from the sensor to the object, please
refer to
this link
for a complete understanding of this measuring technique.
3.1.3 Some important configuration parameters
Below are some important configuration parameters which affect the operation of the device like battery life,
measurement accuracy, and alert threshold.
For Battery life estimation, please refer to this link.
measure_period | Default =1800s
This is the time period for the wireless transmitter to wake up and take the measurement from the transducer.
The default value is 1800s. Users can reduce this value, but smaller value, shorter battery life!
cyclic_data_period | Default = 1800s
Interval time to send an uplink message regardless of any conditions
sensor_boot_time | Default = 500mS
This value will affect the measurement accuracy.
num_of_sample | Default = 30
The higher value, the more filtering. This filtering can eliminate the errors caused by the un-uniformed surface of
the waste and/or the moving of the lid. This value will affect the measurement accuracy.
value!
Those configuration parameters can be changed by downlink or offline tools. For more other configuration parameters,
please refer to the next section.
3.2 Sensor Configuration
3.2.1 How to configure the Sigfox-Ready Ultrasonic level sensor?
Sensor configuration can be configured in 02 methods:
Method 1: Configuring via Downlink message. Please find the instructions in
the
FW version of the Document.
Method 2: Configuring via
3.2.2 What parameters of the device are configured?
Some parameters are read-only, and some are read and writeable.
DO NOT change this value!
off-line
cable.
DO NOT change this
this
link, but please take note of
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