Design and Manufacture Signal Processing Modules to Measure Temperature, Relative Humidity and Light Intensity for the Control Systems in a Vegetable Net House

Abstract

In agricultural practice, planting vegetables in net house is an innovative technology in Vietnam. This allows gardeners to adjust the net house’s environment, which regulates satisfactorily environmental parameters such as temperature, relative humidity and light intensity in each vegetable’s growth and development period. As a result, it improves the commercial vegetable’s quantity and quality. Nonetheless, one of difficulties in controlling net house’s environment is to measure the environmental parameters. Imported devices are the solution, but they are very expensive. The study was conducted to solve this issue. The signal processing modules that could observe temperature, relative humidity and light intensity in net house’s environment were produced by using sensors of PT100, HS1101, and photo-resistor. These modules, whose outputs were developed for industrial standard of 5V, are pretty simple, use easily and cost relatively low. Results of the study contributed to solve initially Vietnamese gardeners’ problems