Smart BLDC Fan with Humidity and Gas Sensors

Ventilation in buildings is important, as lack of a good, clean air supply is detrimental to health and the quality of life. In the UK, ventilation requirements are part of building regulations. According to a report from market researcher BRE, it was estimated that poor housing costs the National Health Service in the UK £2.5bn in treatment costs. Poor indoor air quality has been linked to allergy, asthma and other chronic diseases. High levels of CO₂ can lead to drowsiness, lack of concentration and headaches.

This solution provides a reference design for a BLDC fan controller in smart building automation applications with configurable limits.

System Benefits:

• Precise, factory-calibrated sensors.
• Energy efficient BLDC control for fans.
• Activates the fan only when volatile organic compounds (VOCs), moisture or CO₂ are detected.
• High-performance MCU + FPU designed for motor control. The MCU has all the functions required for an efficient BLDC motor control solution.
• Configurable alarm/interrupt output with static and adaptive levels.