The WS302 is an IoT sound level sensor — it measures ambient decibel (dBA) levels, not people. It is used with the Vemcount Realtime IoT widget to display live noise levels on a dashboard and trigger alerts when thresholds are exceeded.
Use cases
Noise level monitoring in offices, warehouses, gyms, or entertainment venues
Alert when ambient sound exceeds safe working limits (e.g. 65 dBA threshold)
Correlate noise events with footfall data on dashboards
Step 1 — Configure via NFC (Milesight ToolBox)
Download Milesight ToolBox (iOS or Android).
Enable NFC, open the app, and hold your phone against the WS302.
Step 2 — General settings
Reporting Interval | 2 minutes (recommended for monitoring). Range 1 min–unlimited |
LED Indicator | ON (visible confirmation the sensor is active) |
Frequency Weighting | A — matches human ear response (most common setting) |
Fast Time Weighting | OFF (uses standard 125ms response approximating human hearing) |
Step 3 — Calibration (optional)
Enable Sound Pressure Level (SPL) calibration if the sensor is deployed in an environment with constant background noise (e.g. warehouse machinery). Set the calibration value to the ambient baseline so readings reflect relative noise above that baseline.
Step 4 — Threshold alert
SPL Threshold | ON |
Default threshold | 65 dBA (standard safe working level — adjust for your environment) |
Direction | Over — fires when dBA exceeds the set value |
Step 5 — LoRaWAN network settings
LoRaWAN Version | V1.0.2 (preferred) |
Join Type | OTAA |
App EUI |
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Application Port | 85 |
Application Key |
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Support Frequency | EU868 (Europe) or match your region |
ADR Mode | ON |
Important: After changing any settings in ToolBox, always tap Write to apply them to the device. Settings are not saved until written.
Step 6 — Register in Vemcount and display on dashboard
Register the WS302 in ⚙ Settings → Devices with Vendor = Milesight IoT and the correct DevEUI.
On a dashboard, click + → Widget → Realtime.
Select Source Type → choose the WS302 → select Sound Level (dBA) as the metric.
Save — the widget will display live dBA readings updating at your configured interval.
Sound level reference guide
30–40 dBA | Quiet office, library |
50–60 dBA | Normal conversation, open office |
65 dBA | Typical alert threshold — prolonged exposure may be tiring |
70–80 dBA | Busy restaurant, busy retail floor |
85+ dBA | Workplace health and safety concern — hearing protection may be required |