| Amplifier (7) |  |
| Antenna (16) | |
| Circuits (153) | |
| Consumer electronics (27) | |
| Data logger (3) | |
| Electrode (63) | |
| Electronic converters (2) | |
| Electronic device (26) | |
| Electronic equipment (2) | |
| Logic gate (1) | |
| Microchip (5) | |
| Receiver (3) | |
| Sensor (260) | |
| Transmitter (4) | |
| Amplifier (7) | |
| Antenna (16) | |
| Circuits (153) | |
| Consumer electronics (27) | |
| Data logger (3) | |
| Electrode (63) | |
| Electronic converters (2) | |
| Electronic device (26) | |
| Electronic equipment (2) | |
| Logic gate (1) | |
| Microchip (5) | |
| Receiver (3) | |
| Sensor (260) | |
| Transmitter (4) | |
and data collected by the sensors is sent wirelessly to a receiver. A number of battery-free technologies exist that are powered by solar and ambient radio frequency waves.
In both cases the sensors would send a signal to the nearby powered receiver. A temperature change of only 0. 25 degrees Celsius creates enough energy to power the sensor node to read
and send data wirelessly to a receiver 5 meters away. That means any slight shift in an office building s air conditioning or the natural outside air temperature during the course of a day would be more than enough to activate the chemical in the bellows.
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