seeed studio RG-9 Quick Start Manual

Rain Gauge Model RG- 9

Installation and Mounting

1. Set DIP switches .
2. Mount the Rain Gauge
Mount the rain Gauge where it gets a clear measurement of
precipitation– away from overhangs, etc. The mounting arm
is designed to fit over a strap 0.75" (19 mm) wide. Two holes
0.25" (6.35 mm) are placed 0.75" (19 mm) apart. The gland
style connector goes in the bottom hole. Be sure to use wire
rated for outdoor (high-UV) use. For conduit applications, the
mounting arm may be removed, and the wiring hole drilled
out using a step drill to accommodate a ½" EMT
compression connector or similar style of conduit connector.
3. Assemble the Rain Gauge as shown above. The silicone O-
ring fits nicely in the lens groove, but it can fall or slip out
during assembly. After the unit is assembled, visually verify
that the O-ring is properly seated all the way around.

Specifications

Parameter Value
Range 5-16 VDC on J1
Input Voltage
Reverse polarity protected to 50V
Alternative
3.3V though pin 8 on J2. Note if this
isn't a stable supply it could induce
false indications or affect accuracy.
An overvoltage to this pin will
destroy the device.
110 μA nominal. (No outputs on, dry
Current Drain
not raining)
2 - 4 mA when raining
Output NPN Open Collector Output
100 mA / 80V Max
-40°C to +60°C
Operating
Temperature
range
Rain Gauge Model RG-9 Instructions

LED

The LED in the center of the circuit board turns on at
power up and when OUT is on, as an aid to debugging.
On power up:
3 Flashes = > Normal Power Up
4 Flashes = > Lens is not very transmissive, but can still
run at a reduced Accuracy
5 Flashes => The Lens is not able to get sufficient light through for
reasonable readings, it will still try to run but at a significantly reduced
accuracy. This will also print a LensBad message to the Serial
interface.

J1 Connector

OUT - Open Collector Output, Pulled to ground during
rain event V+ - Input Voltage, 5 - 16 VDC
GND - Ground

J2 Connector

J2 is a pin-field on 0.1" centers, used for Serial
communication, and optionally powering the RG-9.
Connector field is 0.025" square pins on 0.1" centers. An
example compatible connector is Molex part number 22-
01-3067. This is available from Digi-Key as part number
WM2004-ND. The necessary crimp-on wire terminals are
Molex 08-55-0131 / DigiKey WM4591-ND.

J2 Pin assignments

1 - GND, Same as J1 GND
2 - V+ 5- 16V, Same as J1 V+
3 - OUT, Same as J1 OUT
4 - Serial OUT
5 - Serial IN
6 -
7 - MCLR
8 - V+ 3.3V

DIP Switches

1 = On, 0 = Off
Switch
Behavior
1 2 3 4
0 0 Sensitivity 1 (Rain Drops)
0 1 Sensitivity 2 (Very Light)
1 0 Sensitivity 4 (Medium)
1 1 Sensitivity 6 (Heavy)
0 0 Monostable Extend - None
0 1 Monostable Extend - 5 min
1 0 Monostable Extend - 10 min
1 Monostable Extend - 15 min
1