Bluetooth LE passive infrared sensor relays control commands in industrial lighting applications

McWong’s Dimming PIR Occupancy Sensor

McWong’s Dimming PIR Occupancy Sensors employ Silvair Mesh on Nordic’s nRF52832 SoC to dim lights via mesh network

Nordic Semiconductor today announces that McWong International, a Sacramento, CA-based developer of lighting control equipment, has selected Nordic’s nRF52832 Bluetooth® Low Energy (Bluetooth LE) System-on-Chip (SoC) to provide the wireless connectivity for its ‘Dimming PIR Occupancy Sensor’.

The Dimming PIR Occupancy Sensor uses passive infrared technology to detect motion and then trigger instructions to control the lighting based on occupancy. The product is targeted at industrial applications, including warehouses, distribution centers, and cold storage facilities. The device provides an energy saving solution by either turning the lighting off completely, or by reducing light levels based on parameters selected by the facility management.

Nordic’s nRF52832 SoC provides the Bluetooth LE connectivity from the device to a user’s Bluetooth 4.0 (and later) smartphone for setup, configuration, and sensor adjustments including time delay, ambient light sensitivity, and motion detection range and sensitivity.

The Dimming PIR Occupancy Sensors employ Silvair’s Bluetooth Special Interest Group (SIG) qualified Bluetooth mesh protocol ‘Silvair Mesh’—running on the Nordic SoC—to support Bluetooth mesh networking between a large number of sensors and other control devices in an industrial lighting setting. Mesh networking allows devices to communicate with any other device with information relayed via other nodes if necessary and without recourse to a central hub device. Such a system enables extended range, flexibility, scalability and redundancy. The mesh networking employed by the McWong sensors relays specific dimming commands with low latency across the network, avoiding the complexity that comes with sending information to each individual sensor in turn. Nordic’s software architecture includes a clear separation between the Bluetooth LE RF protocol software and McWong’s application code—which incorporates the Silvair mesh software—easing development, testing and verification.
the McWong team was impressed with Nordic’s technical documentation and its reputation as a proven industry leader for Bluetooth LE implementation
Stephen Zhou, McWong

Rather than requiring costly and time-consuming hardwiring to a central location, the mesh network offers fast and flexible operations that can be continuously adjusted. The ability to broadcast operating parameters from a smartphone and easily update functionality also makes scalability easier for facility owners and operators.

The Dimming PIR Occupancy Sensor provides 360° of coverage at mounting heights up to 40 feet. The sensor also provides bi-level dimming via 0-10 V control, which complies with many energy code requirements and offers greater energy-efficient performance than simple on/off control. The IP65 rating makes the sensor ideal for wet locations, such as parking structures, nurseries, or loading docks.

Nordic’s nRF52832 multiprotocol SoC combines an 64MHz, 32-bit Arm® Cortex™ M4F processor with a 2.4GHz multiprotocol radio (supporting Bluetooth 5, ANT™, and proprietary 2.4GHz RF protocol software) featuring -96-dB RX sensitivity, with 512kB Flash memory and 64kB RAM. The SoC is supplied with Nordic’s S132 SoftDevice, a Bluetooth 5-certifed RF software protocol stack for building advanced Bluetooth LE applications. The S132 SoftDevice features Central, Peripheral, Broadcaster and Observer Bluetooth LE roles, supports up to twenty connections, and enables concurrent role operation.

“We selected Silvair’s SIG-qualified Bluetooth LE mesh stack (running on Nordic’s nRF52832 SoC) as it aligns fully with the Bluetooth mesh specification, offering the full potential of interoperability for customers and the widest range of product choices both in fixtures and other control devices,” says Stephen Zhou, Vice President of McWong.

“In addition, the McWong team was impressed with Nordic’s technical documentation and its reputation as a proven industry leader for Bluetooth LE implementation.”

About McWong
For 30+ years, McWong has produced superior lighting controls and related electrical power and protection components. Today, McWong has engineered IoT solutions for today’s rapidly changing marketplace. With advanced design and manufacturing facilities, McWong offers extensive component choices for OEMs as well as robust solutions for contractors, ESCOs and facility managers. More information about McWong can be found at