Sensing devices

A sensing device comprising:

• a sensor film including a mixture of sensors, the mixture of sensors including first and second sensors, the first and second sensors being mixed by a mixing ratio, each of the first and second sensors being configured to capture an analyte in a fluid medium to generate a signal in response to capturing the analyte;
• a first detector configured to collect a first signal having a first frequency from at least one of the first and second sensors in the sensor film upon the at least one of the first and second sensors capturing a first analyte in the fluid medium and to calculate a first total concentration of the first analyte in the fluid medium based on the first signal;
• and
• a second detector configured to collect a second signal having a second frequency from at least another one of the first and second sensors in the sensor film upon the at least another one of the first and second sensors capturing a second analyte in the fluid medium and to calculate a second total concentration of the second analyte in the fluid medium based on the second signal, the second frequency being different from the first frequency.