ECOWITT WH51 Manual - User Manual

Thanks for purchasing this Multi-Channel WH51 soil
moisture  sensor.  This  device  measures  soil
moisture.  The  data  can  be  streamed  by  GW1000
Wi-Fi Gateway(sold separately) and can be viewed
on  our  WS  View  mobile  application  after  the Wi-Fi
configuration done.
To  ensure  the  best  product  performance,  please
read this manual and retain it for future reference.

2. Get Started

2.1 Parts List

One Soil Moisture Sensor
One User Manual

3. Overview

LED Indicator (RF transmission)

Battery Cap

Soil Moisture Sensor

4. Setup Guide

4.1 Install batteries

      1.Open  the  battery  cap  of  the  soil  moisture
sensor
      2.Insert one AA battery.
      3.After  inserting  the  battery,  the  remote  sensor
LED indicator will light for 4 seconds, and then flash
once per 70 second thereafter. Each time it flashes,
the sensor is transmitting data.

4.Close the battery cap.
5.Insert the sensor totally into the soil of your
desired location (after the WIFI configuration
done).

5. Wi-Fi Configure with gateway

This soil moisture sensor doesn’t has a display
function and you need to use our WS View App to
view the data on your mobile application after

pairing this device with our GW1000 Wi-Fi
Gateway(sold separately).

5.1 Pair with Gateway

If  GW1000  has  been  in  operation,  and  you  have
never  had  any  WH51  soil  moisture  sensor  setup
before,  just  power  up  the  sensor  and  GW1000  will
pick soil moisture data automatically.

If  a  WH51  sensor  has  been  hooked  on  GW1000
before,  and  you  have  a  new  WH51  sensor  to
replace  the  old  one,  unplug  GW1000  from  USB
socket and power up again, then the new sensor will
be learned and old sensor will be erased.

Note: The gateway can support up to 8 soil moisture
sensors(with  GW100  Firmware  V1.4.6  or  above).
Each  new  sensor  will  be  recognized  as  a  new
channel  according  to  the  Power-on  sequence.  You
may  attach  a  label  of  the  channel  on  each  sensor
for  distinction.  The  channel  name  can  be  edited
both on the app and ecowitt.net(will not sync).

5.2 Wi-Fi Connection for the Gateway

For this part, please refer to the manual of the
GW1000 Wi-Fi gateway.
Any question, please contact the customer service.

6. View Online Data on WS View

When the Wi-Fi configuration is done, you can view
the live data of your soil moisture sensor on the WS
View application.

Note:
1. The soil moisture data can be only viewed on the
Live Data interface since it doesn’t support uploads
to weather underground.
If  you  choose  to  upload  the  data  to  our  weather
server:  https://www.ecowitt.net,  you  can  view  the

live data/history graph and download the records on
the website. You can add a shortcut of the website
on the home screen of your phone for quick access.
2. This soil moisture sensor works with WH0291
Soil

Moisture

Monitor

display

console(sold

separately). The sensor and display console should
be at the same frequency. One console only
receives one channel sensor.

7. Custom mode

When in LIVE DATA display mode, you can calibrate
the soil moisture sensor by enable the Custom
mode.(Click More

– Choose Calibration – Choose

Soil Calibration

– Tick the box on the left side of the

Customize).

Custom OFF:
Moisture  level  is  calculated  based  on  default  dry
and wet definition:
Dry (0%AD) AD: 70
Wet (100% AD) AD: 500

Soil  Moisture  =  (moisture  AD

– 0%AD) * 100% /

(100% AD

– 0%AD )

Example: when sensor moisture AD is 310,
calculated moisture is:
(310

– 70)*100% / (500-70) = 56%.

This is a fixed slope rate linear system.

Custom ON:
When  pot  soil  at  dry  or  wet  condition  is  not  giving
the moisture sensor output value that is close to its
default  assumption,  it  will  give  inaccurate  moisture
level results. It is commonly happening with different
soil  type  that  gives  very  different  output  value  at
same  moisture  level  condition.  We  introduced  this
custom  mode  to  make  this  slope  flexible  so  that  it
can match your soil type.
This becomes a variable slope rate linear system.

Adjusting principle:

0%AD  is  used  to  adjust  for  dry  condition  reading
inconsistency.
    When  the  displayed  moisture  readings  are  too
high at dry soil condition, you could lower the slope
rate by increasing the 0%AD value.

100%AD is used to adapt for wet condition reading
inconsistency.
    When  the  displayed  moisture  readings  are  too
low  at  extremely  wet  soil  condition,  you  could

decrease the 100%AD value to fix it.

Please refer to the below example for better
understanding.

For example:

When you use this product at the first time, please
turn off the custom mode and test the product at the
following two situations:

Situation One:

You  watered  your  potted  plant  with  enough  water
and the soil should be extremely wet, however  the
displayed  moisture  readings  is  much  lower  than
95%(e.g.70%).

Solution:

Enable  custom  mode,  and  adjust  the  100%AD
value.
Calculate the 100%AD value with the formula:
Soil  Moisture  =  (moisture  AD

– 0%AD) * 100% /

(100% AD

– 0%AD )

If:
Now AD = 183
0%AD = 70
Target Soil Moisture Reading = 95%

Then:
95% = (183 - 70)*100%/(100%AD

– 70 )

Result: 100%AD = 188(take the Integer part)

Then you can adjust the default 0%AD value to 188
and touch the screen for once to update the data.
When you get your expected moisture reading, click
Save to save the setting.

Situation Two:

Your potted plant hasn't been watered for very long
time and soil is extremely dry. When at this dry
condition, displayed moisture readings are much
higher than 10%(e.g.40%).

Solution:

Enable  the  custom  mode  and  adjust  the  0%AD
value.
Calculate the 0%AD value with the formula:
Soil  Moisture  =  (moisture  AD

– 0%AD) * 100% /

(500

– 0%AD )

If:
Now AD = 183
100%AD = 500
Target Soil Moisture Reading = 10%

Then:
10% = (183 - 0%AD)*100%/(500

– 0%AD )

Result: 0%AD = 147(take the Integer part)

Then you can adjust the default 0%AD value to 147
and touch the screen for once to update the data.
When you get your expected moisture reading, click
Save to save the setting.

Note:

The soil moisture sensor should be inserted

totally into the soil for accurate result.

Record the 0%AD and 100%AD value for future use
(when WIFI network changed).

8. Specification

Moisture Range:0~100%; Resolution: 1%
0%AD setting range:70~200; Initial value:70
100%AD setting range:0%AD+10~1000; Initial
value:500
Frequency: 433/915/868 MHz(optional)
Sensor reporting interval: 70 seconds
Transmission distance in open field: 100m(300
feet)
IP66 waterproof

Power consumption

•

Soil

moisture

sensor:

1xAA

Alkaline

batteries (not included)

•

Battery life: Minimum 12 months

9. Warranty Information

We disclaim any responsibility for any technical
error or printing error, or the consequences
thereof.

All trademarks and patents are recognized.

We provide a 1-year limited warranty on this product
against manufacturing defects, or defects in
materials and workmanship.

This limited warranty begins on the original date of
purchase, is valid only on products purchased, and
only  to  the  original  purchaser  of  this  product.  To
receive  warranty  service,  the  purchaser  must
contact  us  for  problem  determination  and  service
procedures.

This  limited  warranty  covers  only  actual  defects
within the product itself and does not cover the cost
of  installation  or  removal  from  a  fixed  installation,
normal  set-up  or  adjustments,  or  claims  based  on
misrepresentation  by  the  seller,  or  performance
variations

resulting

from

installation-related

circumstances.