LoRaWAN-WiFi device semiconductor technology-based for airflow measurements in HVAC systems

This paper focuses on designing and implementing an IoT device capable of air flow measurements. The transducer is based on a Positive Temperature Coefficient (PTC) Thermistor and intended to be used with ventilation systems. The PTC Temperature depends on the power level dissipated into the surrounding medium and the airflow velocity. A PCB design and realization are proposed for a device with LoRaWAN and Wi-Fi dual capabilities. In this device and in addition to the PTC, a negative temperature coefficient (NTC) sensor is also considered for temperature compensation. A database and IoT platform are used to collect and store the realtime data of the airflow measurements.