Published January 10, 2022 © GPL3+

Plant watering system (without relay)

Have your plants water themselves when the soil moisture is low!

BeginnerFull instructions provided4,832

Things used in this project

Hardware components

Arduino UNO

Plastic Vinyl tubing

SparkFun Soil Moisture Sensor (with Screw Terminals)

SUBMERSIBLE HORIZONTAL PUMP

Female/Female Jumper Wires

Male/Female Jumper Wires

Software apps and online services

Arduino IDE

Story

This project makes use of a soil moisture sensor module to detect levels of moisture in the soil. If the moisture level is low, the submersible 5V pump pumps water from a source through the tubing into the plant. The soil moisture sensor then detects the moisture and the water stops pumping. The code is set up to perform checks every 12 hours on the moisture level in the soil.

The project does not make use of a relay module as the pump used worked well with low voltage. Some motors and pumps may not work so well under a low voltage in which case the use of a external power supply and relay is required.

Code

Plant watering system

int moisture_sensor = A0; // moisture sensor connected to analog pin A0
int moisture_level ;

void setup() {
   pinMode(4,OUTPUT);
   Serial.begin(9600);
   Serial.println("Getting sensor reading");
   delay(2000);
}

void loop() {
   moisture_level= analogRead(moisture_sensor);
   moisture_level = map(moisture_level,550,10,0,100);
   Serial.print("Moisture level : ");
   Serial.print(moisture_level);
   Serial.println("%");
   if(moisture_level<10){   // if moisture level is less than 10%
      digitalWrite(4,HIGH); // turn on pump
     }
     else{
      digitalWrite(4,LOW); // else no need to pump water
     }
   delay(10 `00); 
}

Credits

rhealv

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