5. Conclusion
In this work we have demonstrated a wireless sensor–actuator system for hazardous gas detection. The sensor node is based on a Wheatstone sensing circuit with a catalytic sensor. The sensing circuit consumes 227 mW that significantly improves relevant state-of-the-art solutions and meets safety requirements.
Upon detection of a dangerous gas in the environment the sensor node communicates to a remote actuator wirelessly relying on ZigBee/IEEE802.15.4 standard and BACnet protocol. The actuator blocks the valve and sends an acknowledgement to the sensor node: the total time required is up to 17 s.