“…On the other hand, there are some other approaches to design the sensor tag based on passive, semi-passive or active operation modes proposed for packaging surveillance applications [ 15 , 16 ]. Some of these designs combine microcontroller architectures with RFID chips to incorporate different environmental sensors together: temperature, light, and acceleration [ 17 ]; temperature, humidity, and gases [ 18 , 19 , 20 ]; ion or gas concentration [ 21 , 22 , 23 ]; pressure [ 24 , 25 , 26 ]; temperature with surface acoustic wave (SAW) sensors [ 27 , 28 ]; or general RFID platforms [ 29 , 30 , 31 , 32 , 33 ]. Other single-chip sensing architectures without a microcontroller unit have also been reported [ 34 , 35 , 36 ].…”