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MAKEVMA303
ARDUINO® COMPATIBLE S OIL MOISTURE SENSOR
+ WATER LEVEL SENSOR MODULE
USER MANUAL
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MAKEVMA303
This device can be used by children aged from 8 years and above, and persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge if
they have been given supervision or instruction concerning the use of the device in a
safe way and understand the hazards involved. Children shall not play with the device.
Cleaning and user maintenance shall not be made by children without supervision.
Indoor use only.
Keep away from rain, moisture, splashing and dripping liquids.
Familiarise yourself with the functions of the device before actually using it.
All modifications of the device are forbidden for safety reasons. Damage caused by user
modifications to the device is not covered by the warranty.
Only use the device for its intended purpose. Using the device in an unauthorised way
will void the warranty.
Damage caused by disregard of certain guidelines in this manual is not covered by the
warranty and the dealer will not accept responsibility for any ensuing defects or
problems.
The dealers cannot be held responsible for any damage (extraordinary, incidental or
indirect) – of any nature (financial, physical…) arising from the possession, use or
failure of this product.
Due to constant product improvements, the actual product appearance might differ from
the shown images.
Product images are for illustrative purposes only.
Do not switch the device on immediately after it has been exposed to changes in
temperature. Protect the device against damage by leaving it switched off until it has
reached room temperature.
Keep this manual for future reference.
USER MANUAL
1. Introduction
To all residents of the European Union
Important environmental information about this product
This symbol on the device or the package indicates that disposal of the device after its lifecycle could
harm the environment. Do not dispose of the unit (or batteries) as unsorted municipal waste; it should
be taken to a specialized company for recycling. This device should be returned to your distributor or to
a local recycling service. Respect the local environmental rules.
If in doubt, contact your local waste disposal authorities.
Please read the manual thoroughly before bringing this device into service. If the device was damaged in
transit, do not install or use it and contact your dealer.
2. Safety Instructions
3. General Guidelines
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This package includes a water level sensor and a soil moisture sensor.
If the boards have water covering the sensor parts, an analogue value will be available at the "SIG"
connection.
voltage ...................................................................................................................5 VDC
dimensions .................................................................................................... 65 x 20 mm
weight ........................................................................................................................ 5 g
The hardware consists of an Arduino® microcontroller (here a MAKEVMA100 Arduino® Uno) and the soil
moisture sensor module.
The soil moisture sensor module, built around the LM393 comparator (not included), gives an active-low (L)
level output when the soil is dry (determined by a pre-set threshold value). This digital output (wet soil → L /
dry soil → H) is routed to one I/O terminal (D2) of the Arduino® microcontroller. Based on this input (at D2)
Arduino® gives an active-high (H) output through D13 when the soil is dry, and an active-low (L) output
when the soil is wet.
The +5 V supply line (VCC) of the module is linked to the 5 V line of the Arduino®. GND of the module is the
common (0 V) connection. The digital signal output to be detected (usually marked as DO in the module) is
applied to input D2 of the Arduino®. The analogue output (marked as AO) from the module is not used here.
The sensor head of the module contains two probes in a small metal PCB. When the sensor head is inserted
in wet soil, the moisture bridges the probes through a low-resistance path (when the soil is dry, resistance
between the probes is also high). A potentiometer in the module will adjust the soil wet/dry detection
sensitivity according to actual requirements.
4. What is Arduino
Arduino® is an open-source prototyping platform based in easy-to-use hardware and software. Arduino® boards
are able to read inputs – light-on sensor, a finger on a button or a Twitter message – and turn it into an
output – activating of a motor, turning on an LED, publishing something online. You can tell your board what to
do by sending a set of instructions to the microcontroller on the board. To do so, you use the Arduino
programming language (based on Wiring) and the Arduino® software IDE (based on Processing).
Surf to www.arduino.cc and www.arduino.org for more information.
®
5. Overview
6. Making a Soil Moisture Sensor
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int GLED= 13; // Wet Indicator at Digital PIN D13
int RLED= 12; // Dry Indicator at Digital PIN D12
int SENSE= 0; // Soil Sensor input at Analog PIN A0
int value= 0;
void setup() {
Serial.begin(9600);
pinMode(GLED, OUTPUT);
pinMode(RLED, OUTPUT);
Serial.println("SOIL MOISTURE SENSOR");
Serial.println("-----------------------------");
}
void loop() {
value= analogRead(SENSE);
value= value/10;
Serial.println(value);
if(value<50)
{
digitalWrite(GLED, HIGH);
}
else
{
digitalWrite(RLED,HIGH);
}
delay(1000);
digitalWrite(GLED,LOW);
digitalWrite(RLED, LOW);
}
7. Example
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© COPYRIGHT NOTICE
All worldwide rights reserved. No part of this manual may be copied, reproduced, translated or reduced to
any electronic medium or otherwise without the prior written consent of the copyright holder.
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