User Manual

June 10, 2021 Ecoh 915 Manual 1.0.3 Pag. 16 of 25
4.10.2. Operational description
ECOH US915 is a magnetic sensor for Smart Parking vehicle detection.
It’s based on a magneto-resistive chip, able to detect the presence of a metallic mass close to it.
This device measures the magnetic earth field, and the variations induced by metal masses placed
in its vicinity.
The measurement is made on three axis and the sum of these three values gives the total result.
The use of three thresholds allows sensor to identify the status of free or busy of the parking bay.
ECOH US915 after its installation needs to be calibrated at its magnetic zero.
When it’s operational, it samples every x seconds (adjustable from 5 sec. to 30 min.), the status of
the magnetic field.
If the magnetic value is same the previous read it returns in sleep mode.
If the magnetic value exceeds the set thresholds it switch on the LoRa WAN radio and it transmit
the packet (free or busy plus timestamp and other parameters) to the LoRa WAN network and
through this to the backend and to the front end software.
If for a long time sensor doesn’t detect any variation, it transmit a Keep Alive message to the
backend. Keep Alive can be set from 60 minutes to 24 hours, it depends from the use of sensors
and from the performances required by the customer.
Power is guarantee by a high power LiSoCl2 not rechargeable battery, with 17000 mA/h at 3.6V.
The LoRaWAN identifiers and keys must be registered in the LoRaWAN network server before starting the node in
order to receive data.
For OTAA mode: DevEUI, AppEUI and Appkey.
For ABP mode: DevEUI, DevAddr, NwkSKey and AppSKey.