| This board is perfect for blocking irrigation
clock pulses to latching valves.
Drawing only 65uA during normal operation,
this board is perfect for applications where battery life is
critical. It interfaces directly to Vegetronix soil
moisture sensors, and has a variable
resistor which set's the relay trigger point. Because it uses a
low power latching relay, it only requires a brief pulse of current
to update the state of the relay. The soil moisture sensor is
sampled every 10 minutes to update the state of the
relay.
It has 2 LEDs to indicate that the
board has power, and the on/off state of the relay. For low power
mode the LEDs can be disabled with a simple jumper switch.
It can be wired in series to valves including
latching valves and block
watering events from a valve clock.
The VG-RELAY-LATCH board interfaces to a single
VG400 soil sensor, and can activate a low power AC load such as a valve
or alarm, or other control device, when a moisture level is reached.
The threshold is easily set with the onboard variable resistor, and
a small screwdriver. The
relay board can be configured with a jumper to turn the relay on
when the sensor detects wetness or on when the sensor detects
dryness.
This board has a special configuration mode,
which can be entered by setting a jumper. In configuration
mode, the LEDs are active, and the sensor and variable resistor are
continuously updated. This mode consumes more power, so it
should not normally be used beyond initial calibration.
The VG-RELAY-LATCH also serves as an evaluation
board. If you are thinking about testing our VG400 soil
moisture sensors you should consider purchasing this board as
well.
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