iGrow 1800 Installation Guide
Page76
Link4 (714) 524-0004
04 Irr04 Irr
Mode: Trigger
hr mm ss
OnTime: 00:00:00
The external trigger option is designed to turn on your irrigation valve(s) from an external switch such as a
momentary wall switch or a lysimeter. The external trigger input should already be assigned in the Setup Inputs
screens. See Setup Inputs Section for more details.
Note:
The iGrow 1600/1800™ digital input has an internal 10K pull up resistor to +3.3V. If the external trigger
input is pulled low by an external device for more than 50 msec then the input is deemed
valid
.
04 Irr04 Irr
Start
__at__
09:00A
End at 07:00P
Trigger
The iGrow 1800™ enables the external trigger only between the
Start
and
End
times. These two time values
can be astronomically adjusted with respect to either sunrise or sunset.
Soil Trigger Irrigation
The Soil Trigger irrigation option is designed to turn on your irrigation valve(s) from an input threshold
being reached. An example of such a device is a “soil moisture” sensor.
04 Irr04 Irr
Mode: Soil Trig
hr mm ss
OnTime: 00:00:00
The first screen is where you set the valve
OnTime
once the threshold is triggered.
04 Irr04 Irr
Start
__at__
09:00A
End at 07:00P
Soil
Trig
This second screen is where you set the time window during which you will allow the irrigation valve to be
triggered. If the threshold is reached outside this time window, the irrigation will be triggered at the start
of the time window. Both the start and stop times can be fixed times by selecting the
at
option or they
can be based on Sunrise and Sunset.
