User's Manual

WA020100 - Smart Irrigation Controller
UMAOC001 Rev G
USER MANUAL
Page 13 of 33
6 OPERATION
Watersens is a smart electrovalve controller which is powered by batteries. To preserve the battery life, it is
very important to reduce the power consumption when equipment is not carrying out any task, therefor the
Watersens enters in deep sleep mode.
Watersens exits from deep sleep mode if internal alarm wakes up the equipment or if it is detected a NFC
signal.
6.1 Internal alarm wakeup
Watersens wakes up each 15 minutes matching with quarter hour (XX:00, XX:15, XX:30 and XX:45) with a
random time deviation from 0s to +10s. This random time is performed by the control unit to avoid possible
collisions for uplinks from different Watersens units.
After waking up Watersens carries out several tasks:
 Measures battery voltage
 Measures internal temperature
 Performs an irrigation operation if it is scheduled according to timetable for each electrovalve and
updates valve cycles counters
 Reads external inputs (depending on the model)
 If it is scheduled sends device status and receive data from server
 Check if it is the end of the day (00:00h) to update in EEPROM counters (electrovalve operations,
frame counters, etc),
All these tasks take 30 seconds
6.2 NFC signal detection
When NFC field is detected, Watersens wakes up and checks if it is received any command from mobile
application. Commands available are:
 Read status parameters
 Read memory configuration (communication and irrigation parameters)
 Write memory configuration (communication and irrigation parameters)
 Time and date synchronization
 Initialize communications
When the NFC field disappears Watersens enters again in deep sleep mode.