Portable electrochemical nutrient testing device for soil health monitoring

A portable electrochemical nutrient testing device, comprising:

• a function generator block attached to said electrochemical nutrient testing device configured to produce a change in voltage or current signal;
• at least one screen-printed electrochemical sensor configured to test analytes from nutrients derived from a sample, comprising:
• a working electrode positioned inside an insulating area appropriately chemically modified to perform an electrochemical reaction when said sample comes in contact with the working electrode;
• a counter electrode disposed on a paper substrate and positioned relative to the working electrode to complete an electrochemical circuit;
• a reference electrode positioned in said screen-printed electrochemical sensor configured to provide a stable reference potential;
• a plurality of contact pads connected to said working electrode, said counter electrode and said reference electrode,
• wherein the electrochemical nutrient testing device is configured to apply an input waveform generated by the function generator block between said working electrode and said reference electrode, such that current flows between said working electrode and said counter electrode;
• a voltage control module connected to said function generator block and said screen-printed electrochemical sensor, wherein the voltage control module is configured to maintain a potential at the working electrode corresponding to the input waveform generated by said function generator block with respect to the reference electrode;
• a data acquisition module connected to a voltage difference controller of the voltage control module, wherein the data acquisition module is configured to receive a voltage signal from said voltage difference controller and filter out higher-order harmonics from the voltage signal;
• a micro-controller unit connected to said data acquisition module and comprising an analog-to-digital converter configured to receive the filtered voltage signal from the data acquisition module, store the filtered voltage signal as a sample value, and process said sample value to obtain a nutrient content of said sample;
• a display unit connected to said micro-controller and configured to display the obtained nutrient content of said sample from the micro-controller, wherein the display unit comprising a portable liquid crystal display (LCD) configured to display soil, water or plant health information based on the nutrient content of said sample;
• a location intelligence module configured to store geographical conditions of a location from which the sample is collected;
• and
• a processing module configured to receive location intelligence data from the location intelligence module and the nutrient content, and to analyze the location intelligence data and the nutrient content to generate a nutrient map,
• whereby said electrochemical nutrient testing device is configured for in-field nutrient analysis to monitor soil, water and plant health.