A system of a machine, the system comprising: a network of a plurality of nodes (68a, 68b) distributed throughout the machine, each of the nodes operable to communicate through a plurality of electromagnetic signals; a radio frequency transceiver; a first antenna coupled to the radio frequency transceiver; a second antenna coupled to one or more sensor nodes of the plurality of nodes (68a, 68b); and a controller coupled to the radio frequency transceiver and configured to select at least one sensor node to interrogate, transmit one or more interrogation frequencies from the radio frequency transceiver through the first antenna to the second antenna, receive one or more sensor frequencies at the first antenna broadcast from the second antenna based on a frequency response of the at least one sensor node to the one or more interrogation frequencies, and determine one or more sensed values based on the one or more sensor frequencies received at the radio frequency transceiver through the first antenna; characterized in that: the one or more sensor nodes comprise a first sensor node interfaced or combined with multiple sensors and a second sensor node interfaced or combined with multiple sensors; the first sensor node comprises a first mechanical resonator having a first resonant frequency and is configured to respond to a first frequency of the one or more interrogation frequencies; the second sensor node comprises a second mechanical resonator having a second resonant frequency that is different to the first resonant frequency, and is configured to respond to a second frequency of the one or more interrogation frequencies, said interrogation frequencies being pure tones that provoke a resonance response in an associated sensor node; and at least one of the first sensor node and the second sensor node is configured to return a plurality of sensor frequencies, indicative of a plurality of sensed values, and wherein a sensor of the sensor nodes can be identified by the frequency closeness of a tone to a designated resonant frequency, such that multiple sensors can be simultaneously read. a network of a plurality of nodes (68a, 68b) distributed throughout the machine, each of the nodes operable to communicate through a plurality of electromagnetic signals; a radio frequency transceiver; a first antenna coupled to the radio frequency transceiver; a second antenna coupled to one or more sensor nodes of the plurality of nodes (68a, 68b); and a controller coupled to the radio frequency transceiver and configured to select at least one sensor node to interrogate, transmit one or more interrogation frequencies from the radio frequency transceiver through the first antenna to the second antenna, receive one or more sensor frequencies at the first antenna broadcast from the second antenna based on a frequency response of the at least one sensor node to the one or more interrogation frequencies, and determine one or more sensed values based on the one or more sensor frequencies received at the radio frequency transceiver through the first antenna; characterized in that: the one or more sensor nodes comprise a first sensor node interfaced or combined with multiple sensors and a second sensor node interfaced or combined with multiple sensors; the first sensor node comprises a first mechanical resonator having a first resonant frequency and is configured to respond to a first frequency of the one or more interrogation frequencies; the second sensor node comprises a second mechanical resonator having a second resonant frequency that is different to the first resonant frequency, and is configured to respond to a second frequency of the one or more interrogation frequencies, said interrogation frequencies being pure tones that provoke a resonance response in an associated sensor node; and at least one of the first sensor node and the second sensor node is configured to return a plurality of sensor frequencies, indicative of a plurality of sensed values, and wherein a sensor of the sensor nodes can be identified by the frequency closeness of a tone to a designated resonant frequency, such that multiple sensors can be simultaneously read. the one or more sensor nodes comprise a first sensor node interfaced or combined with multiple sensors and a second sensor node interfaced or combined with multiple sensors; the first sensor node comprises a first mechanical resonator having a first resonant frequency and is configured to respond to a first frequency of the one or more interrogation frequencies; the second sensor node comprises a second mechanical resonator having a second resonant frequency that is different to the first resonant frequency, and is configured to respond to a second frequency of the one or more interrogation frequencies, said interrogation frequencies being pure tones that provoke a resonance response in an associated sensor node; and at least one of the first sensor node and the second sensor node is configured to return a plurality of sensor frequencies, indicative of a plurality of sensed values, and wherein a sensor of the sensor nodes can be identified by the frequency closeness of a tone to a designated resonant frequency, such that multiple sensors can be simultaneously read.