PiCUS Tree Motion Sensor Online

The PiCUS TMSO is an innovative system for the remote monitoring of tree groups. The sensors are based on the established TMS3 while the results are provided to the user directly using the new cloud-based data upload.


PiCUS TMSO - Consistently Developed

WLAN or LTE Connection - Direct Data Upload
Cloud Storage - Measuring Data is Available Any Time, Anywhere
Solar Charger - Runtime of Several Months!

Measuring Procedure

Similar to the Tree Motion Sensors of the 3. generation the TMSO record tree tilt movements under natural wind influence. The combination of tree tilt data with wind velocity recordings represents the trees behaviour under wind load.

In order to save energy the TMSO focuses on periods of recognised movement. These are identified by comparing the raw data to the result of the assigned control sensor and stored in the cloud memory.

In the cloud the data may be accessed from any workstation – No need to spend time to fetch the sensors and get the data manually. The measuring results are available nearly in real time!

The PiCUS TMSO system is able to remain in position several months, under favourable conditions even up o whole year. Commands and status reports are exchanged via the cloud. Measuring cycles and data processing are conveniently managed from your desk at any time.

System Layout

The PiCUS TMSO is designed as a network. The central node is the radio unit. It connects to up to 20 sensors which are mounted on trees in a radius of 50 meters and collects their data. The central radio unit uploads the collected data to the cloud where it is accessible for the user.

Control commands are entered on the computer, saved in the cloud, downloaded by the central unit and distributed to the sensors.


Energy Concept

Since the PiCUS TMSO system is optimized for long term measurements the second most important topic after measuring is energy management.

All components of the system of the system are designed to be as sparing with energy as possible and have large batteries. To increase the runtime further all devices are also equipped with solar cells. While the battery alone would last several months thanks to the enormous energy efficiency the solar energy recharges the batteries and increases the range significantly.

In theory the system allows runtimes under temperate conditions between half a year and one year!

The following example shows exemplarily the battery voltage of three TMSO components during a winter in temperate climate.


The presented period covers five months from the beginning of December to the end of April. The vertical lines each mark the beginning of a recorded wind event. During the recording the system consumes much more energy than in stand-by mode.

It can be seen that all devices discharge continuously but very slowly. It is also visible that beginning in March the number of sunny days increases and the batteries are being charged.

In case of the central unit the charging is especially fast because it has by far the largest solar panel. The sensors need more time to charge but also here the trend is obvious. Even sensor 28 which was started without being fully charged shows a clearly positive trend and has not been even close to the turn-off limit during the winter.

This PiCUS TMSO system is ready to measure some more months.


This example shows a group of trees that belong to a stand that was monitored using PiCUS TMSO. The group consists of three firs (Abies grandis) and three oaks (Quercus robur). All recordings have been controlled by one assigned control sensor.

In this graphic the wind velocity (km/h) and tree inclinations (°) are plotted against the time.


At windspeeds of up to 78 km/h different inclinations were measured on the trees. The control sensor which is mounted higher regularly yields he highest values. It is easy to tell tat the oaks tilt less than the firs. Among the firs there is one specimen sticking out.

This impression is supported by the wind tipping curves. Here the inclination values of all senors are plotted against the wind velocity. Each curve represents the behaviour of an individual tree.


The conspicuous tree is number 18. The single tree data view highlights tree 18’s tilting behaviour.


The PiCUS TMSO easily allows to keep suspicious trees like this in sight.

This tree was identified in the group with very little effort and thanks to the untiring sensors it may be monitored continuously. Also in the next storm – near real time.

Technical Data

TMSO Zentraleinheit
Property Value
Colour light-grey
Weight 560 g
Dimensions (without antenna) 150 mm x 100 mm x 70 mm
Housing protection Dust-tight & protected against the effect of temporary immersion in water
Accuracy tilt measurement 0,03°
Accuracy tilt measurement  0,005°
Measuring interval 0,05 s (20Hz)
Type of inclination measurement 3D-measurement
Alignment of the sensor any
Accuracy temperature measurement 1 °C
Permissible temperature range  -20 - +50 °C
Accuracy battery voltage measurement 0,01V
Resolution humidity measurement 1% rel. humidity
Accuracy moisture measurement  +/- 2& rel. humidity (temperature compensated)
Capacity 11000 mAh
Runtime (reference value under normal environmental conditions and usage behavior) 100 days
Loading procedure USB
Backup storage  
Storage type internal flash memory
Memory size 256 MB
To mobile phone (control) Bluetooth Low Energy 4.2
To PC (data download) USB 2.0
Online connection (data upload) WLAN or LTE
TMSO Sensor
Property Value
Colour grey
Weight 175 g
Dimensions 95 mm x 39 mm x 21 mm
Housing protection Dust-tight & protected against the effects of permanent immersion in water
Mounting 1 chipboard screw (countersunk head without milling ribs, max. 5 mm Ø)
Capacity 2950 mAh
(reference value under normal environmental conditions and usage behavior)
100 days
Loading procedure Wireless, via TMS.Single charger
Accuracy tilt measurement 0,03°
Resolution Tilt measurement 0,005°
Measuring interval 0,05 s(20Hz)
Type of inclination measurement 3D-measurement
Alignment of the sensor Beliebig
Accuracy temperature measurement 1 °C
Permissible temperature range -20 - +50 °C
Accuracy battery voltage measurement  0,01 V
TMSO Transportkoffer
Property Value
Sensors in storage 20
Dimensions 600 mm x 450 mm x 200 mm
Weight, empty 2,7 kg
Weight, starter kit complete 11 kg

Technical Requirements

1.1 Mobile Phone Requirements
  Android - Device Apple - Device
Operating system Android 4.3 or higher iOS8 or higher

Bluetooth Low Energy

GPS or higher

Compass recommended

100 MB free memory

1.2 Requirements PC
 Operating system Windows(7), 8.1, 10
  • Processor 1 GHz(Intel recommended)
  • at least 1 GB RAM (8 GB recommended)
  • Hard disk 5 GB free space
  • USB available
  • 100 MB free memory
Registration Internet connection required, after registration also fully usable offline