Doc Number: ARA2022-00006 Rev A
Date: July 11, 2022
This firmware release 188.8.131.52 is a general release for better operations in the field. Specifically,
the release improves the handling of anomalies in wind readings and the mitigation of errors in
humidity and temperature sensor reporting. A new command to initiate a reset by Arable
Customer Success was also added in the release. This reset can be used as a quick tool by
Arable Customer Success to do initial troubleshooting and recovery actions before a roundtrip
out to the field is requested.
The firmware 184.108.40.206 is compatible with Arable Mark 2 hardware Rev 3.94, 3.93, 3.91, 3.1 and
3.0. The Arable Mark 2 Rev 3.91 and above are validated for use with AT&T in the US and
globally as well as for Claro in Brazil. Arable Mark 2 Rev 3.1 is to be used for Telstra in
The new 5W Solar Panel SKU 850-0024 can be used with Arable Mark 2 Rev 3.94 and 3.93
The use of Arable Mark 2 and Arable Solar with a 20-min sync interval for faster weather alerts
is in a limited release as we build more field data for different geographies and conditions. You
can reach out to Arable Customer Success at email@example.com or via the Help icon in the
Arable Mobile/Web to enable this on a per unit basis.
|Date||July 11, 2022|
|Arable Mark 2 Rev 3.94, 3.93, 3.91, 3.1 and 3.0|
Quectel BG95M3LAR02A03_01.014.01.014 (AT&T)
Quectel BG96MAR02A07M1G (AT&T 02A07_01.016 & Telstra
|Davis Wind Anemometer 6410 and 7911
GEMS PS41 Series Pressure Switch
Sentek Drill and Drop Soil Moisture Probe
|Markets||For Deployment: Argentina (AT&T 2G)
Australia (LTE-M Telstra)
Brazil (AT&T 2G) and (Claro LTE-M)
Canada (LTE-M AT&T)
Chile (AT&T 2G)
Colombia (AT&T 2G)
Ecuador (AT&T 2G)
France (LTE-M & 2G AT&T)
Germany (2G AT&T)
Mexico (LTE-M & 2G AT&T)
Peru (2G AT&T)
Poland (2G AT&T)
Spain (2G AT&T)
UK (AT&T 2G)
US (LTE-M AT&T)
List of Changes
|A new command to remotely initiate a reset of the Mark has been added in
220.127.116.11 in order to avoid requesting a field visit to do an initial recovery
attempt. The command will be sent by Arable Customer Success from the
Arable backend system and will restart the Arable Mark.
|The priority for the anemometer pulse data collection task (used for wind
speed) was increased in 18.104.22.168 alongside with the introduction of an
electrostatic interference filter that compares rising and falling pulses for
differences. These changes allow the Arable Mark to better handle corner
cases where the pulse data collection window closes late and as such create
higher wind speed values than it should. The occurrences of these overestimations were less than 0.3% in 22.214.171.124 but were still noticeable as creating spikes in the Arable Web graphs and other time series data representations.
|Some units with firmware 126.96.36.199 and 188.8.131.52 had shown to experience
sensor errors for relative humidity, pressure and Tair within months after initial deployment (i.e. unrelated to long life). These sensor data gaps came from a failure to recover from an error on the communication bus that connects the Pressure, Temperature & Humidity chamber and its associated circuit board with the main Mark. A reset of the device clears this state and was added in 184.108.40.206 to occur every 24 hours. A further refinement of the recovery logic is now released with 220.127.116.11 that avoids a complete reset and re-initializes the communication bus as soon as the error occurs.
|We have also made an effort on 18.104.22.168 to reduce a firmware data logger
reset8 in the Arable Mark. The particular case that was tackled related to a
special condition where the Pressure, Temperature and Humidity chamber was not accessible from the data logger for more than 25 minutes and as such triggered a reset8. Our statistics from early deployments of 22.214.171.124 shows that this type of reset is now largely removed.
|Even with firmware 126.96.36.199, we have seen rare cases where higher than
expected wind speed spikes still show up. In this case, the spikes in wind
speed are linked to the hourly communication sync periods. These anomalies
occur only on 2G GSM 900 MHz deployments (so outside of North America)
and most often relate to installations where the anemometer cable is wired too close to the antenna of the Arable Mark. While we are working with the few customers impacted by this to wire the anemometer cable further away from the antenna, we are also considering adding a logic to detect and filter these anomalies. Occurrences are less than 0.03% of all the wind speed data readings for Arable Marks with firmware 188.8.131.52.
|The Arable Mark omits to send any wind speed data in case of zero wind
speed in 184.108.40.206 (and in earlier releases as well). That is today shown as
missing data in the Arable API, Arable Web and Arable Mobile. A better
handling of zero wind speed is planned to be introduced in an upcoming
|Where we use AT&T roaming and use 2G GSM, we have many cellular
carriers to select from. In a few cases, we have seen a bias by the embedded Mark 2 Quectel modem to select networks that on the surface looks favorable, but aren’t when taking into consideration its capability to perform reliable application data transfer. We are actively pursuing to add logic that can take over in these circumstances and steer the modem back to the best network selection from an application viewpoint.
|The Arable Mark Quectel modem has capabilities to provide horizontal
estimation and precision for its GPS location readings that we have not utilized to its fullest extent yet in the Arable system. We plan to include such
information in an upcoming firmware release so that the Arable backend
system can make better decisions on which GPS readings to rely on.
|In order to ensure season-long operations of the Arable Mark 2, it is recommended to deploy with the external Arable Solar panel.||BUGS-630|
|The battery percentage value for the Arable Mark 2 can temporarily dip to zero if the system gas gauge resets. It will go back up to its actual value after a few minutes of retraining. At low voltage levels, close to the 3.1kV communications cut-off, the battery voltage can fluctuate widely and preemptively show zero even though it is possible to send data for a few more hours.||BUGS-1188|
|The Mark 2 uses Satellite-based GPS to detect its location. If the unit is placed indoors, where no GPS signal can be retrieved, it will not be able to provide the correct location coordinates. This will in turn impact the user interface display in the Arable Web and the Arable Mobile. While we are exploring back-up capabilities for latitude/longitude retrieval, it is recommended for now to make deployments outdoors for full feature use.||BUGS-1005
|There can be a small drift of a few seconds between the data collection
windows in the Mark 2. This does not prevent the correct operations on the
Arable Web and Mobile UI at an hourly time scale, but API users should be
aware of this when aligning Mark data with other sources.