Published Paper Details:

In agriculture field, farmers are facing many problems, but the one major problem here is to know which type of soil is suitable for cultivating plants. So we are doing this project to show digitally, which type of soil is helps to grow the plants to increase the yield. The major aim of this research is to use color sensor for the detection of NPK, Nitrogen (N), Phosphorus (P) and Potassium (K) level in soil. A color sensor is used to measure and to detect the presence of NPK content of soil. The color sensor�s photodiode is designed to decide the amount of additional contents of these nutrients that has to be added into the soil to increase soil richness and fertility. The color sensor is implemented as a nutrition detection sensor which consists of four LEDs as light source and a photodiode as a light detector. Color of soil is changed with the help of capsule. The light from LEDs falls on soil mixture and reflected back after absorption. The TCS3200 color sensor is associated with 8*8 arrays of photodiodes with four different filters. By selecting the photodiode filter�s readings, able to find the intensity of the various colors. The nutrient absorbs the light from LED and the photodiode convert the remaining light that is reflected by reflector (sample) to current. The color sensor has a current-to-frequency converter that converts the photodiode�s readings and results into square waveform with a frequency that is directly proportional to the light intensity of the chosen color. This frequency is then, read by the Arduino uno. The output from the color sensor is converted to digital readable form. Then LCD display shows which growth is suitable for the tested soil by comparing output with database. Keywords: Color Sensor, NPK, LED, photodiode, wifi module.