Abstract: A heating, ventilation, and air conditioning (HVAC) communication method comprising generating, at a transmitter device, a primary signal and a secondary signal. Each of the signals comprise digital temperature data and digital humidity data. The secondary signal is a phase shifted representation of the primary signal. The HVAC communication method further comprises transmitting the primary signal and the secondary signal to a receiver device via a wireless link. The method continues by storing a look-up table that maps bit streams to temperature values and humidity values. The method continues by performing, at the receiver device, a comparison using the primary signal to execute error checking, and determining, at the receiver device, a temperature value and a humidity value using the look-up table based on the comparison.

Abstract: A heating, ventilation, and air conditioning (HVAC) communication method comprising generating, at a transmitter device, a primary signal and a secondary signal. Each of the signals comprise digital temperature data and digital humidity data. The secondary signal is a phase shifted representation of the primary signal. The HVAC communication method further comprises transmitting the primary signal and the secondary signal to a receiver device via a wireless link. The method continues by storing a look-up table that maps bit streams to temperature values and humidity values. The method continues by performing, at the receiver device, a comparison using the primary signal to execute error checking, and determining, at the receiver device, a temperature value and a humidity value using the look-up table based on the comparison.

Abstract: A heating, ventilation, and air conditioning (HVAC) device that includes a transmitter configured to generate a transmission signal. A splitter is operably coupled to the transmitter and is configured to output the transmission signal to an antenna and output a reflected signal to a microprocessor. The HVAC device also includes a memory that is operable to store at least a baseline frequency threshold for a room. The microprocessor is operably coupled to the transmitter, the splitter, the memory, and is configured to determine a frequency difference between the frequency of the transmission signal and the frequency of the reflected signal, compare the frequency difference to the baseline frequency threshold, determine that an object is moving when the frequency difference is greater than the baseline frequency threshold, and output a first control signal to adjust a temperature if the object is determined to be moving.

Abstract: A radio frequency identification (RFID) transponder (FIGS. 4 and 5A) is disclosed. The transponder includes first (RF) and second (GND) terminals. A first resonant circuit (500, 504, 508) is connected between the first and second terminals. A second resonant circuit (502, 504, 508) has a second resonant frequency different from the first resonant frequency and is connected between the first and second terminals.

Abstract: A radio frequency identification (RFID) transponder (FIGS. 4 and 5A) is disclosed. The transponder includes first (RF) and second (GND) terminals. A first resonant circuit (500, 504, 508) is connected between the first and second terminals. A second resonant circuit (502, 504, 508) has a second resonant frequency different from the first resonant frequency and is connected between the first and second terminals.