Remote wireless switch sensing circuit using RF transceiver in combination with a SAW chirp processor

A circuit assembly for sensing a state of a variable state device wherein a data signal representative of the state is communicated via wireless telegraphy comprising:

• a surface acoustic wave (SAW) device having a plurality of interdigital transducers (IDTs) comprising a wave launching IDT and a state information IDT wherein the plurality of IDTs are in acoustical communication and the state information IDT is in selective electrical communication with an antenna by the variable state device, the variable state device being disposed to selectively interrupt the electrical communication between the state information IDT and the antenna;
• an RF transceiver for communicating a trigger signal to the SAW device wherein the trigger signal causes a launching of a SAW wave from the wave launching IDT towards the state information IDT and the state information IDT generates an electrical signal pulse in response thereto, said electrical signal pulse being selectively communicated to the antenna through said variable state device;
• and,
• a transceiver control module in operative communication with the RF transceiver for enabling communication of the trigger signal and for reading the data signal comprising an absence or presence of the signal pulse wherein the trigger signal and the data signal are communicated between the RF transceiver and the SAW device via wireless telegraphy.