Calibration of soil humidity sensors of automatic irrigation controller

Automatic Calibration of Multiple Coplanar Sensors

This paper describes an algorithm for recovering the rigid 3-DOF transformation (offset and rotation) between pairs of sensors mounted rigidly in a common plane on a mobile robot. The algorithm requires only a set of sensor observations made as the robot moves along a suitable path. Our method does not require synchronized sensors; nor does it require complete metrical reconstruction of the env...

Automatic Frequency Calibration Using Fuzzy Logic Controller

A way of frequency calibration using jizqv logic controller (FLC) is presented in this paper. Generally, atomic clocks tend to drzfr due to temperature, aging, or some emironmental eflects. It is sure that one cannot compensate for the drift with a fuced amount of control quantity. As a controller, it has the task to adaptively catch up with the vurzation. Our approach takes advantage of FLC to...

Inexpensive and Automatic Calibration for Acceleration Sensors

In this paper, we present two methods for calibration of acceleration sensors that are inexpensive, in-situ, require minimum user interaction and are targeted to a broad set of acceleration sensor applications and devices. We overcome the necessity of orthogonal axes alignment by extending existing calibration methods with a non-orthogonal axes model. Our non-orthogonal method can furthermore b...

Developing Irrigation Conservation Strategies Using Soil Moisture Sensors and ET

Effective Calibration of Low-Cost Soil Water Content Sensors

Soil water content is a key variable for understanding and modelling ecohydrological processes. Low-cost electromagnetic sensors are increasingly being used to characterize the spatio-temporal dynamics of soil water content, despite the reduced accuracy of such sensors as compared to reference electromagnetic soil water content sensing methods such as time domain reflectometry. Here, we present...