LXE NoiseMeter User manual

NoiseMeter
soundlevelmeter with Sigfox
- instructions -
table of contents
1 NoiseMeter – soundlevelmeter with Sigfox.......................................2
1.1 NoiseMeter v1.0.................................................................................2
1.2 scope of delivery................................................................................2
1.3 putting into service.............................................................................2
2 perational modes.......................................................................3
2.1 L GGER mode...................................................................................3
2.2 T GGLE mode....................................................................................4
2.3 SIGF X mode....................................................................................4
3 How to use NoiseMeter..................................................................4
3.1 USB connection..................................................................................4
3.2 Power supply.....................................................................................5
3.3 Sensor and analog processing..............................................................5
3.4 Calibration........................................................................................5
3.5 Sigfox and data processing..................................................................5
3.5.1 soundlevel postprocessing example...............................................6
3.5.2 battery voltage postprocessing example.........................................7
3.6 REST Api - IBM Watson.......................................................................7
4 Technical data.............................................................................8
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1 NoiseMeter – soundlevelmeter with Sigfox
Thank you for purchasing NoiseMeter.
1.1 NoiseMeter v1.0
Version 1.0 is the first series of NoiseMeter and still awaiting
several improvements, marked by <v1.0 > throughout the
manual.
Customers of v1.0 devices are entitled to free exchange once v1.1
devices are released.
The respective timeline is: v1.0 devices are released in August
2018. Planned release of v1.1 is february 2019.
1.2 scope of delivery
•NoiseMeter including mount adaptor
•Windscreen
•Antenna
1.3 putting into service
If switch is off, battery is disconnected.
If switch is on, battery is connected.
∆ switch only applies to the battery, if you want to switch off NoiseMeter,
additionally un-plug SB connector.
In total, there are three ways to power the device:
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Abbildung 1: rear panel of NoiseMeter
RF ant Switch mount USB solar plug

•USB cable Mini-B (max. 5V supply)
•USB plug from solar panel cable
•internal battery
Connect the antenna and use a USB cable to connect to your PC.
NoiseMeter should register itself as a USB device. Use a terminal
program to connect to the serial port (9600 – 8bit – 1 -1) Now
the device is operating and running in „L GGER“ mode. After half
an hour, it sends the first Sigfox message. You need ID and PAC to
log into backend.sigfox.com
∆for transfer of sigfox devices (from LXE to you) you need the last PAC
from us, which is labeled on the device.
2 Operational modes
NoiseMeter comes with 3 modes
•L GGER mode is default and sends regular sigfox messages
of continuous soundlevel measurements
•T GGLE mode for calibration
•SIGF X mode for testing TX connectivity
2.1 LOGGER mode
After putting NoiseMeter into service, double click <ENTER>.
NoiseMeter is operating in default mode L GGER and showing:
20:90 737 L
20:89 784 L
20:88 883 H
20:87 873 H
HIGH L W
part second 87,3dB range mode HIGH / L W
The scheduling is fixed to one sigfox uplink per 30 minutes. We
can upload 20 values. Each value represents a „part“ of 90
seconds length. Measurement interval is 1 second. nly the
maximum out of a 90 second „part“ is transmitted.
After sending 24 telegrams or 12 hours, a 25th gives the battery
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voltages. The scheduling is given in 4.
ther parameters available in hardware :
•weighting function 'dBA' and 'dBC' <'dBA' v1.0>
•filter 'slow' 'fast' <'fast' v1.0>
•automatic high and low range switching
High and low range switching uses a threshold value of 80dB. A
hysteresis is applied to avoid toggling around threshold value. If
going from low to high, the threshold is about 88dB. If going from
high to low, the threshold is about 71dB.
2.2 TOGGLE mode
Toggle mode allows calibration and testing NoiseMeter if connected
to PC via USB cable. High and low mode pathes are toggled every
10 seconds.
2.3 IGFOX mode
Sigfox mode is helpful if setting up a connection to sigfox network.
It is sending 3 TX uplink messages towards the network and
receives one.
3 How to use NoiseMeter
This chapter describes USB connection, power supply, sensor and
calibration.
3.1 U B connection
Connect a USB cable (USB mini B connector) to USB jack, the
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Abbildung 2: schedule of Logger Mode
dBA dBA dBA
09:30
10:00 09:30
1 2 3 24 25
dBA V
21:00 21:01
# of telegram
content
Time

other side to a PC. pen a Serial Terminal programm (putty,
Teraterm) and connect to the C M port.
Double-click <ENTER> opens and ends menu options.
3.2 Power supply
NoiseMeter uses a LiPo battery and a solar panel to be energy self-
sufficient in outdoor installations. Additionally, the battery can be
re-charged via USB cable. The nominal voltage of the LiPo cell is
3,7V. If it falls below 2,7V, the device is switched off
automatically.
∆immediately before installation, fully re-charge the device. It is best
done from a PC where you can observe the voltage data.
3.3 ensor and analog processing
NoiseMeter provides a high range measurement IC performing
over 100dB. This is a huge span with the largest signal
10^(100/10) = 10.000.000.000 times the smallest. NoiseMeter
uses overlapping ranges with Low Range from 30 to 100 dBA and
High Range from 70 to 130 dBA.
3.4 Calibration
For calibration, use a sound level calibrator suitable for ½''
microphones. Remove the cover screws (polyamide) marked with
H and L (High and Low). Insert microphone into calibrator chamber
and apply calibrator signal (1kHz, 94 dB). Adjust the
potentiometers below with a suitable screwdriver (slotted 2x0.4
mm)
3.5 igfox and data processing
Sigfox allows a maximum of 140 telegrams per day, each a
maximum of 12 byte long. In order to compress the data, we split
10 out of the 12 byte in 4 bit words giving bins from 1 to 16.
After a „part“ (see 2.1) is measured, only its maximum value is
stored. After all „parts“ are measured, Min and Max are
determined. 16 bins are computed and every „part“ is assigned to
one bin.(6)
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3.5.1 soundlevel postprocessing example
In Sigfox backend, we find the timestamp and a string of 24
characters, in Hex numbers. Each represents a 4 bit word. The first
20 characters assign the bins, character 21-21 is Min and 23-24 is
Max.
Given that, we can calculate back the dB sound levels and display
them over time:
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Abbildung 3: a) schematic sigfox data b) example
byte1
byte12
8bit
Abbildung 4: backend sigfox com sound level data example
Abbildung 5: device 18ED2E data decoding example

3.5.2 battery voltage postprocessing example
After 24 soundlevel telegrams, one voltage level telegram is sent.
The format is 12 bytes representing one measurement every hour.
The number needs to be multiplied by 20 to get Voltage in mV.
Hex dec >> dec * 20 = mV
c9 201 >> 201* 20 = 4020 mV
With Sigfox ID and PAC you can register your device in Sigfox
cloud.
Sigfox backend allows you to set up callbacks to several REST Api
providers.
<v1.0 NoiseMeters v1.0 are under contract lxelectr_3a79_5b62 for
one year. Please contact Sigfox how to access your prototype
devices using ID and PAC.>
3.6 RE T Api - IBM Watson
We provide an exemplary setup in IBM Watson IoT platform. As a
customer you get access to our IBM Watson organization in the
role of 'developer'. Please register on internetofthings.ibmcloud.com
nce you provide us the email adress assigned to your IBMID, you
will be added as member.
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Abbildung 6: backend sigfox com battery voltage data example

4 Technical data
frequency: 868 [MHz]
output power: 13 [dBm]
sigfox RC: RCZ-1 (EU)
USB 2.0 device Mini B
microphone: ½'' LXE M1
sensitivity: 61 [dB]
protection: Acoustic Vent ®Gore GAW334
range: 30 - 130 [dB]
battery: 1S 900 [mAh]
voltage: 3.7 max. 4.2 [V]
solar panel: 0.19 [W]
5.0 [V]
size: 210 x 70 x 25 [mm]
weight: 250 [g]
mounting adapter: GoPro
LXElectronics – Michael Poschmann
Am Bahnsteig 10 – 82024 Taufkirchen
[email protected] – www.lxel.de
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