System and method for monitoring environmental conditions

A system comprising:

• a humidity sensor coupled to a first analog integrator;
• a temperature sensor coupled to a second analog integrator;
• a first comparator coupled to the first analog integrator;
• a second comparator coupled to the second analog integrator;
• an analog-to-digital converter coupled to the humidity sensor and the temperature sensor;
• and
• a control module coupled to the first and second analog integrators, the first and second comparators, and the analog-to-digital converter.

A method of tuning a system for monitoring environmental conditions of a perishable product, the method comprising:

• fabricating a capacitor comprising a first capacitive plate formed on an upper surface of a polymer substrate and a second capacitive plate formed on a lower surface of the polymer substrate, the first and second capacitive plates comprising a capacitive plate material;
• removing capacitive plate material while measuring the capacitance of the capacitor until a selected capacitance is reached;
• and
• incorporating the capacitor into an analog integrator circuit configured to receive an input signal from an environmental sensor capable of monitoring one or more environmental conditions of the perishable product.