Laser level sensor WS201

for solidsLoRaWANwireless

Overview
WS201 is a wireless fill-level monitoring sensor for roll-based supplies (toilet paper, paper towels) using ToF (Time of Flight) distance measurement. It delivers accurate remaining-fill detection and real-time status updates over LoRaWAN® for long-range, low-power deployments. The device supports NFC commissioning and integrates with Milesight gateways and Milesight IoT Cloud for centralized monitoring.

Key features

• ToF-based distance measurement with minimal blind zone; detection range 1–55 cm, accuracy ±1 cm.
• Configurable threshold alerts for low / refill notifications.
• Ultra-low power operation on a single CR2450 coin cell (590 mAh) with multi-year battery life under typical reporting settings.
• LoRaWAN® connectivity for wide coverage and penetration.
• Compact form factor (66 × 38 × 12 mm) for compatibility with varied dispenser sizes.
• NFC on-site configuration via Milesight ToolBox app; DevEUI accessible by QR on the device front.
• Hibernate Mode to suspend reporting during defined off-hours.

NFC configuration & commissioning

• Configure and switch the device on/off wirelessly using Milesight ToolBox via NFC.
• Commissioning steps: install ToolBox app, enable NFC on phone, tap device, verify password and push settings.

Applications

• Public restroom and facility toilet paper dispenser monitoring and automated replenishment alerts.
• Paper towel level monitoring in washroom and hospitality settings.
• Small-item or shelf stock monitoring where short-range ToF sensing is suitable.
• Integration into Smart Restroom and facility hygiene workflows.

Integration & cloud management

• Compatible with standard LoRaWAN® gateways and integrates with Milesight IoT Cloud for visualization, reporting and real-time alerts.
• Supports scene-based automation and mobile device management (Android & iOS).

Installation & maintenance

• Mount with 3M adhesive tape on flat surfaces or use optional magnetic mounting kit for flexible placement.
• Buckle-open lid design for straightforward battery replacement and maintenance access.

Notes

• Designed to fit diverse dispenser geometries thanks to its thin housing; verify installation position for optimal ToF measurement.
• Use Hibernate Mode to reduce reporting during planned off periods and extend battery life.

Technical specifications

• Model: WS201
• Detection: ToF distance measurement; Field of view: 25°; Range: 1–55 cm; Accuracy: ±1 cm; Resolution: 1 mm (close range).
• Wireless: LoRaWAN® (OTAA/ABP, Class A); Frequencies: CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923-1/2/3/4; Tx power up to 22 dBm; Sensitivity down to -132 dBm @ 300 bps.
• Hardware: White PC+ABS (flame retardant); Dimensions: 66 × 38 × 12 mm; Weight: 24.7 g (with battery).
• Power: 1 × CR2450 590 mAh coin cell; battery life varies with report interval and settings (laboratory guidelines provided).
• Environment: Operating temperature -10°C to +60°C; RH 0–95% non-condensing; Ingress protection: IP30.
• Configuration: NFC via Milesight ToolBox app; DevEUI via QR code; support for downlink configuration.
• Certifications: CE, FCC, RoHS.