Milesight WS302 Sound Level Sensor User Guide

Milesight WS302 Sound Level Sensor

Safety Precautions

Mile sight will not shoulder responsibility for any loss or damage resulting from not following the instructions of this operating guide.

• The device must not be remodeled in any way.
• In order to protect the security of the device, please change the device password when first configuration. The default password is 123456.
• Do not place the device outdoors where the temperature is below/above operating range. Do not place the device close to objects with naked flames, heat source (oven or sunlight), cold source, liquid and extreme temperature changes.
• The device is not intended to be used as a reference sensor, and Milesight will not take responsibility for any damage which may result from inaccurate readings.
• The battery should be removed from the device if it is not to be used for an extended period. Otherwise, the battery might leak and damage the device. Never leave a discharged battery in the battery compartment.
• The device must never be subjected to shocks or impacts.

Declaration of Conformity

WS302 is in conformity with the essential requirements and other relevant provisions of the  CE, FCC, and RoHS

Copyright © 2011-2022 Milesight. All rights reserved. All information in this guide is protected by copyright law. Whereby, no organization or individual
shall copy or reproduce the whole or part of this user guide by any means without written authorization from Xiamen Milesight IoT Co., Ltd.

For assistance, please contact
Milesight technical support:
Email: iot.support@milesight.com
Tel: 86-592-5085280
Fax: 86-592-5023065
Address: Building C09, Software Park III, Xiamen 361024, China

Revision History

Product Introduction

Overview

WS302 is a LoRaWAN® sound level sensor with an integrated microphone. WS302 can not only measure a wide range of noise levels and send various kinds of noise level values via LoRaWAN® network, but also supports multiple weighting measurements for different application scenarios. WS302 can be widely used in smart buildings, smart cities, schools,
health monitoring, etc.
Sensor data are transmitted in real-time using the standard LoRaWAN® protocol. LoRaWAN® enables encrypted radio transmissions over long distances while consuming very little power. The user can obtain sensor data and view the trend of data change through Milesight IoT Cloud or through the user’s own Application Server.

Features

• Robust LoRa connectivity for secure long range transmission
• Support multiple weighting measurements to suit different scenes
• Support measuring various kinds of values to judge the sound level accurately
• Easy configuration via NFC
• Equipped with LED indicator to indicate the threshold alarm
• Standard LoRaWAN® supported
• Milesight IoT Cloud compliant

Hardware Introduction

Packing List

| 1 × WS302 Device
---|---
| 2 × ER14505 Li-SOCl2
Batteries
| 1 × 3M Double-Sided
Tape
| 2 × Wall
Mounting Kits
| 1 ×
Theft-Deterring Screw
| 1 ×
Quick Guide
| 1 ×
Warranty Card

If any of the above items is missing or damaged, please contact your sales representative.

Hardware Overview

LED Patterns

On: Off → On
Power Off: On → Off
Reset to Factory Default| Press and hold the power button for more than 10 seconds| Quickly Blinks
Threshold Alarm| When the level does not exceed the threshold| Green Blinks
When the level exceeds the threshold for more than 1 minute| Red Blinks

Dimensions (mm)

Power Supply

Remove the rear cover of the device to install the batteries, do not reverse the direction of the
batteries when installing.

Note: The device can only be powered by ER14505 Li-SOCl2 batteries.

Operation Guide

NFC Configuration

WS302 can be configured via an-NFC supported mobile phone.

1. Download and install “Milesight ToolBox” App from Google Play or Apple App Store.
2. Enable NFC on the smartphone and open Milesight ToolBox.
3. Attach the smartphone with NFC area to the device to read device information.
4. Basic information and settings of devices will be shown on Tool Box if it’s recognized successfully. You can read and configure the device by tapping the Read/Write button on the App. In order to protect the security of devices, password validation is required when first configuration. The default password is 123456.

Note:

1. Ensure the location of the smartphone NFC area, and it’s recommended to take off the phone case.
2. If the smartphone fails to read/write configurations via NFC, keep the phone away and back to try again.
3. WS302 can also be configured by ToolBox software via a dedicated NFC reader provided by Milesight IoT, you can also configure it via TTL interface inside the device.

LoRaWAN Settings

LoRaWAN settings are used for configuring the transmission parameters in LoRaWAN® network.
Basic LoRaWAN Settings:
Go to Device - > Setting -> LoRaWAN Settings of ToolBox App to configure join type, App EUI,
App Key and other information. You can also keep all settings by default.

is 85.
Join Type| OTAA and ABP modes are available.
Application Key| Appkey for OTAA mode, default is 5572404C696E6B4C6F52613230313823.
Device Address| DevAddr for ABP mode, default is the 5th to 12th digits of SN.
Network Session Key| Nwkskey for ABP mode, default is 5572404C696E6B4C6F52613230313823.
Application Session Key| Appskey for ABP mode, default is 5572404C696E6B4C6F52613230313823.
Spread Factor| If ADR is disabled, the device will send data via this spread factor.
Confirmed Mode| If the device does not receive ACK packet from network server, it will resend data once.
Rejoin Mode| Reporting interval ≤ 30 mins: the device will send a specific number of LinkCheckReq MAC packets to the network server every 30 mins to validate connectivity; If there is no response, the device will re-join the network. Reporting interval > 30 mins: the device will send a specific number of LinkCheckReq MAC packets to the network server every reporting interval to validate connectivity; If there is no response, the device will re-join the network.
Set the number of packets sent| When rejoin mode is enabled, set the number of LinkCheckReq packets sent.
ADR Mode| Allow network server to adjust datarate of the device.
Tx Power| Transmit power of device.
RX2 Data Rate| RX2 data rate to receive downlinks.
RX2 Frequency/MHz| RX2 frequency to receive downlinks.

Note:

1. Please contact sales for device EUI list if there are many units.
2. Please contact sales if you need random App keys before purchase.
3. Select OTAA mode if you use Milesight IoT cloud to manage devices.
4. Only OTAA mode supports rejoin mode.

LoRaWAN Frequency Settings:
Go to Setting - > LoRaWAN Settings of ToolBox App to select supported frequency and select
channels to send uplinks. Make sure the channels match what you set in the LoRaWAN® gateway.

If frequency is one of CN470/AU915/US915, you can enter the index of the channel that you want to enable in the input box, separating them by commas.

Examples:
1, 40: Enabling Channel 1 and Channel 40
1-40: Enabling Channel 1 to Channel 40
1-40, 60: Enabling Channel 1 to Channel 40 and Channel 60
All: Enabling all channels
Null: Indicates that all channels are disabled

Basic Settings

Go to Device Setting - > Basic -> Basic Settings of ToolBox App to change the reporting interval,
etc.

Reporting Interval| Reporting interval of noise level and battery level to the network server.
Default: 10 mins, Range: 1 – 1080 mins
---|---
LED Indicator| Enable or disable the indicator threshold alarm feature in chapter 2.3.
Frequency Weighting| Choose A weighting or C weighting to detect environmental sound.
A-weighting: suitable for normal environment like office, hospital, residential, etc.
C-weighting: suitable for noisy environment (> 100dB) like factories, construction yards, dancing halls, etc.
Fast Time Weighting| Enable or disable fast time weighting, this suit the environment in which sound has great fluctuation. It will increase power consumption as well as shorten the battery life.
Change Password| Change the password for ToolBox App to write this device.

Advanced Settings

Calibration Settings

Go to Device Setting -> Basic -> Calibration Settings of ToolBox App to set the numeral
calibration of sound pressure level. With the calibration value saved, the device will add the
calibration value to the raw value in each report automatically.

Threshold Settings

Go to Device - > Settings -> Threshold Settings of ToolBox App to enable the threshold settings
and input the threshold. It will upload the current data once when SPL value exceeds the
threshold for more than one minute.

Maintenance

Upgrade

1. Download firmware from Milesight website to your smartphone.
2. Open Toolbox App and click “Browse” to import firmware and upgrade the device.

Note:

1. Operation on ToolBox is not supported during an upgrade.
2. Only Android version of ToolBox supports the upgrade feature.
   

Backup

WS302 supports configuration backup for easy and quick device configuration in bulk. Backup is allowed only for devices with the same model and LoRa frequency band.

1. Go to the “Template” page on the App and save current settings as a template. You can also edit the template file.
2. Select one template file that is saved in the smartphone and click “Write”, then attach it to another device to write the configuration.
   

Note: Slide the template item left to edit or delete the template. Click the template to edit the configurations.

Reset to Factory Default

Please select one of the following methods to reset the device:
Via Hardware: Hold on to the reset button inside the device for more than 10s. After the reset is complete, the indicator will blink in green twice, and the device will reboot.
Via Tool Box App: Go to Device - > Reset to click “Reset”, then attach smartphone with NFC area to device to complete reset.

Installation

Fixed by Screws:

1. Remove the rear cover of the device, screw the wall plugs into the wall, and fix the rear cover with screws on it, then install the back of the device.
   

2. Fix the bottom of the device to the rear cover with the theft-deterring screw.

Fixed by 3M Tape:

1. Fix the bottom of the device to the rear cover with the theft-deterring screw.

2. Paste 3M double-sided tape to the back of the device, then tear the other side off and place it on a flat surface.
   

Note:
In order to ensure the best detection, please install the device as follows:

• The recommended installation height is 1.2 m to 1.5 m.
• The distance between the device and walls or reflectors should be at least 1 m, and the distance between the device and doors or windows should be about 1.5 m.
• Do not install the device close to the noise source.
• The microphone on the device should not be blocked or trapped by obstacles.
• Recommend installing the device to the ceiling when you need to measure sound level in a small room.

Device Payload

All data are based on the following format (HEX), the Data field should follow little endian:

For decoder examples please find files on https://github.com/Milesight- IoT/SensorDecoders.

Basic Information

WS302 reports basic information of sensor whenever joining the network.

Example:

ff0bff ff0101 ff166743c13353300001 ff090100 ff0a0102 ff0f00

Channel| Type| Value| Channel| Type| Value
ff| 0b (Power On)| ff (Reserved)| ff| 01 (Protocol Version)| 01 (V1)
Channel| Type| Value| Channel| Type| Value
ff| 16| 6743c13353| ff| 09| 0100
(Device SN)| 300001| (Hardware version)| (V1.0)
Channel| Type| Value| Channel| Type| Value
ff| 0a (Software version)| 0102 (V1.2)| ff| 0f (Device Type)| 00 (Class A)

Sensor Data

WS302 reports sensor data according to reporting interval (10 mins by default).

Bytes)+Lmax (2 Bytes) Weighting Mode:
01: A-weighting+disable time weighting 02: C-weighting+disable time weighting
05: A-weighting+enable fast time weighting
06: C-weighting+enable fast time weighting

Example:

017564 055b 05 3f02 da01 6a02

Channel| Type| Value
01| 75 (Battery)| 64 => 100%
Channel| Type| Value
05| 5b (Noise Level)| 05 => A-weighting + enable fast time weighting
| | 3f 02 => 02 3f = 575, LAF = 575÷10 = 57.5 dBA
da 01 => 01 da = 474, LAeq = 474÷10 = 47.4 dBA
6a 02 => 02 6a = 618, LAFmax = 618÷10 = 61.8 dBA
---|---|---

Downlink Commands

WS302 supports downlink commands to configure the device. The application port is 85 by default.

Byte 1-3: 0a0000
Byte 4-5: threshold value*10
2f (LED Indicator)| 00: disable, 01: enable
5d (Set Weighting Mode)| 2Bytes
Byte 1:
01: A-weighting,
02: C-weighting
Byte 2:
00: disable time weighting, 01: enable fast time weighting
10 (Reboot Device)| 1 Byte, ff

Example:

1. Set reporting interval as 20 minutes.
   ff03b004

   Channel| Type| Value
   ff| 03 (Set Reporting Interval)| b0 04 => 04 b0 = 1200s = 20 minutes

2. Set weighting mode to A-weighting and disable fast time weighting.
   ff5d0100

   Channel| Type| Value
   ff| 5d (Set Weighting Mode)| 01: A-weighting,
   00: disable time weighting

3. Enable threshold alarm and set threshold value as 65 dB.
   ff060a00008a02

   Channel| Type| Value
   ff| 06 (Set Threshold Alarm)| 8a 02=>02 8a = 650
   650/10=65 dB

4. Reboot the device.
   ff10ff

   Channel| Type| Value
   ff| 01 (Reboot)| ff (Reserved)

Appendix

Sound Level Guidelines

It’s recommended to maintain environmental noises below 70 dBA over 24 hours (75 dBA over 8-hours) to prevent noise-induced hearing loss.

References

• GitHub - Milesight-IoT/SensorDecoders

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