24
ObservAir
Operating Manual
Command (cmd)
Value (val)
Function
$setID
0 to 1000
Set sensor ID
$setFR$val
30 to 200
Set sample flow rate in ccm
$setSamplePeriod$val
2 to 60
Set measurement period in seconds
$setTimeZone$val
-12 to 12
Set time zone in hours from GMT
$syncTime$
N/A
Sync time with internet server (Time
zone must be set)
$setTime$YYYY,MM,
DD,HH,MM,SS
date/time
Manually set clock to specified
date/time
$deviceInfo$
N/A
Returns all sensor settings
$setMaxATN$val
10 to 150
Set the maximum attenuation (ATN)
value, above which alarm is triggered
$ATNreset$
Reset the attenuation (ATN) to 0
$setLEDmode$val
BC, GAS1,
GAS2,
ALERT, OFF
Set the LED to pollutant concentration
display, alerts only, or turn off
$setLEDmaxConc$val
0.2 to 50
Set maximum concentration displayed
by LED button (red)
$setLEDra$val
60 to 3600
Set running average size (in seconds)
for the LED concentration display
$setLEDtimeout$val
0 to 60
LED display timeout duration in
minutes. 0 = LED on indefinitely.
$setDLPF$ val
0 / 1
Toggle the DLP filter applied to the
pollutant concentration data
$setEnvComp$val
0 / 1
Toggle DST environmental
compensation algorithms
$setLTE$val
0/1
Toggle LTE enable
$setGPS$val
0 / 1
Toggle GPS logging
$setGPSsample
Period$val
2 to 60
Set the GPS update period in seconds
$setGasSignals$val
0 / 1
Toggle logging of gas sensor(s) signals
$setSaveData$val
0 / 1
Toggle data logging (0 = no data is
being saved to SD card)
$setMAC$val
9.0 to 15
Set mass absorption coefficient (MAC)
$setFRcal$val
0.8 to 1.2
Set flow rate calibration coefficient
Table 7.
ObservAir serial commands and descriptions
25
ObservAir
®
Operating Manual
3.7.
WiFi connection
Provisioning WiFi credentials to the ObservAir allows the sensor to
automatically sync time, receive over the air (OTA) firmware updates and
technical support. In the future, cloud-based services and a mobile app will
also be available over the WiFi connections. Follow the instructions below
to provision WiFi credentials:
1.
Cycle through the interactive LED button menu until the LED flashes
blue twice (provisioning mode).
2.
The sensor will restart into provisioning mode, and slowly glow on and
off (‘breathe’) in a blue color to indicate that it is ready and
broadcasting a WiFi network.
3.
From a computer or mobile device, log onto the “Our Product” WiFi
network.
4.
A captive portal (Figure 13) will appear requesting your WiFi network’s
SSID and password. The ObservAir is only compatible with 2.4 GHz WiFi
networks.
5.
Once credentials are submitted, the ObservAir will restart and begin
logging air quality measurements as usual.
Figure 13.
Screenshot of the ObservAir’s captive portal, as viewed from a
mobile device. Enter you WiFi network’s credentials and press submit.
When WiFi credentials are provisioned, the sensor will be able to
automatically connect to the network and sync the internal clock time if a
timestamp error is detected while logging. During normal operation, the
WiFi module remains powered off. WiFi is only enabled during over-the-air
(OTA) firmware updates and technical support. WiFi credentials must be
provisioned using the instructions provided here prior to initiating any OTA
software features.