SIMPLE SOIL MOISTURE SENSOR – ARDUINO PROJECT

This is a simple arduino project for a soil moisture sensor that will light up a LED at a certain moisture level. It uses Arduino Duemilanove microcontroller board. Two wires placed in the soil pot form a variable resistor, whose resistance varies depending on soil moisture. This variable resistor is connected in a voltage divider configuration, and Arduino collects a voltage proportional to resistance between the 2 wires.


Insert the 2 probes (wires, pcb) in the dry soil and measure the resistance value and then pour water and measure it again.
Use a mid value for the resistor (eg: 50kΩ for 100kΩ in dry soil and 10kΩ in wet).

The other method to find the resistor’s value is to try different values or use a potentiometer. Insert the probes into the soil that has the desired moisture when to light up the LED and signal that the plant needs water.

Adjust the potentiometer and see the point at which it starts to light. Measure the potentiomenter current value and replace it with a fixed resistor.

Arduino soil moisture sensor schematic

Project source code

const int VAL_PROBE = 0; // Analog pin 0
const int MOISTURE_LEVEL = 250; // the value after the LED goes ON

void setup() {
Serial.begin(9600);
}

void LedState(int state) {
digitalWrite(13, state);
}

void loop() {
int moisture = analogRead(VAL_PROBE);

Serial.println(moisture);

if(moisture > MOISTURE_LEVEL) {
LedState(HIGH);
} else {
LedState(LOW);
}
delay(100);
}

Tags: ARDUINO, PROJECT

Views: 2534

Latest Activity

Shannon Bradley and Marcelo Rodrigues are now friends
18 hours ago
Terry Renner is now a member of GarageLab (arduino, electronics, robotics, hacking)
21 hours ago
Andy S posted a discussion

Arduino MEGA boolean?

Hi everyone,been banging my head against the wall a few days now.i have a small project, where i…See More
yesterday
Bobby Marshall posted a video

SELFIE Mirror

Meet the S.E.L.F.I.E., the "The Self Enhancing Live Feed Image Engine". Find out how it works: http://istrategylabs.com/2014/04/take-an-instant-selfie-with-t...
yesterday
GarageLab posted a blog post
yesterday
pj jones posted a status
"Designing an Home Automation Project"
Monday
Profile Iconpj jones, Robert Kribel and Lars Goldschlager joined GarageLab (arduino, electronics, robotics, hacking)
Monday
Fontaine Pierre commented on GarageLab's blog post Tutorial: Using GPS Shield as an Anti-Theft Device
"Hi, Is it possible to make a car tracker with this GPS + GSM shield to send a message if limits…"
Friday
GarageLab posted a blog post
Friday
Profile Iconeslam mohamed haredy, Wesley Castillo and Lise Pape joined GarageLab (arduino, electronics, robotics, hacking)
Apr 10
Terry Dark left a comment for Beula Isaac
"Hi Beulah, Greetings from down under (Australia) Please tell me about yourself and your interests…"
Apr 9
Terry Dark and Beula Isaac are now friends
Apr 9
GarageLab posted blog posts
Apr 9
GarageLab posted a blog post

Festo's BionicKangaroo gets the hop on energy-efficiency

The BionicKangaroo features pneumatic actuators that provide the jumping power and at the same time…See More
Apr 7
Profile IconAnthony Parker, John Nicosia and Tom Devey joined GarageLab (arduino, electronics, robotics, hacking)
Apr 7
wani sageer posted photos
Apr 6
GarageLab posted a blog post

Using a 3D Printer to Draw Tattoos: InkD

 It’s one thing to allow a professional tattoo artist to ink your arm. It’s another thing…See More
Apr 4
GarageLab posted a blog post

Dispensing Solder Paste With A 3D Printer

There’s a strange middle ground in PCB production when it comes to making a few boards. Dispensing…See More
Apr 3
Duong Nguyen is now a member of GarageLab (arduino, electronics, robotics, hacking)
Apr 3
GarageLab posted blog posts
Apr 1

© 2014   Created by Marcelo Rodrigues.

Badges  |  Report an Issue  |  Terms of Service