Radio frequency identification (RFID) tag(s) and sensor(s)

A wireless sensor comprises:

• an antenna operable to receive an inbound radio frequency (RF) signal and to transmit an outbound RF signal;
• a sensing element proximal to the antenna, wherein the sensing element, when sensing a first environmental condition, changes a characteristic of an RF front-end of the wireless sensor;
• a tuning circuit operably coupled to adjust the RF front-end to compensation for the change in the characteristic, wherein the RF front-end includes two or more of:
• the antenna, the sensing element, and the tuning circuit;
• a reference circuit block operable to generate a signal based on a low voltage low frequency input that corresponds to a second environmental condition;
• a processing module operably coupled to:
• generate a first digital value based on the adjustment to the RF front-end, where the first digital value is a representation of the first environmental condition;
• and
• generate a second digital value based on the signal, where the second digital value is a representation of the second environmental condition;
• and
• a transmitter operable to generate the outbound RF signal, which includes at least one of the first and second digital values.