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Optical sensor based soil nutrients and pH level measurement system



  1. Department of Electrical & Electronic Engineering, University of Chittagong, Chittagong-4331, Bangladesh


A pH and major soil nutrients (namely, nitrogen, potassium and phosphorous) measurement system based on optical sensing has been designed and constructed. By illuminating white light on the water solution of the soil sample added with certain reagents the optical sensor detects the color of the solution. The detected color, which appears as voltage signal, is compared with stored database and upon further processing the microcontroller calculates the level of pH and amount of nitrogen, potassium and phosphorous of the soil. The system has been thoroughly tested using different varieties of soil samples and comparing the measurements against the measurements from existing techniques used by the soil scientists. The difference of measurement is extremely small which is perfectly acceptable for agricultural applications. The digitized measured data can be displayed or sent to the computer for further processing and storage..


Soil nutrients, pH level, Soil test, Optical sensing, ICT in agriculture.

Submitted at: Aug. 31, 2018
Accepted at: April 8, 2019


H. K. ROUF, M. JAHED, ASADUZZAMAN, Optical sensor based soil nutrients and pH level measurement system, Journal of Optoelectronics and Advanced Materials Vol. 21, Iss. 3-4, pp. 265-269 (2019)