Operation Principle - daviteq WS433-M12F-ATE User Manual

5. Operation principle

Process of measurement
When the sensor sampling time interval is reached, for example 2 minutes, the node will wake up and switch ON the
power supply to supply the energy to external sensor to start the measurement. Depends on the type and
characteristic of external sensor, the sensor will take a certain time to finish the measurement.
For example, the measurement time is 200mS, after this time, the node will read the value of sensor using I2C, node
will switch OFF power supply to external sensor to save energy.
Once reading the sensor value, the raw data is X, it can be scaled to any engineering value by the following formula:
Where
X: the raw value from sensor
Y: the calculated value for parameter 1's value or parameter 2's value
Y = aX + b