Check your plant soil moisture with this simple tester. You will know if you need to water your plants.

I have some plants and I wanted to know if they needed some water.

I created a device that allows me to know if I need to water my plants.

I used a soil moisture sensor this measure ground conductivity. I connected it to an Arduino Uno and created some levels of soil moisture. The device has three LEDs. Green, yellow and red. Green led shows me that the soil moisture is good. Yellow shows me the soil moister is enough and red led shows the plants need water.

Supplies

Soil moisture sensor. https://amzn.to/2ySiC07
Small breadboard. https://amzn.to/2JSaA9P
3 330 Ω resistors. https://amzn.to/2JWRW0s
5mm red led. https://amzn.to/3a3FoyJ
5mm yellow led.
5mm green led.
Cable jumpers. https://amzn.to/3aVv8dg
Arduino Uno. https://amzn.to/2JWSDqA
Power Bank Anker (optional). https://amzn.to/2RvtmIj
Breadboard jumper wires. https://amzn.to/3erzRFY

Step 1: Have Supplies on Hands

You should have your supplies on hands.

That save you time.

Step 2: Make Connections

Use the schematic to make the connections between components.

Step 3: Upload the Code

Upload the code to the Arduino Uno.

// Soil moisture tester

// Set leds numbers
const int verde = 8;          
const int amarillo = 9;
const int rojo = 10;
// Set analog input
const int sensor = A0;
// Variable to store moisture value
int humedad = 0;
void setup() {
  
  //Set name as outputs
  pinMode(verde, OUTPUT);
  pinMode(amarillo, OUTPUT);
  pinMode(rojo, OUTPUT);
}
void loop() {
  humedad = analogRead(sensor); //take the lecture from the sensor
  if(humedad < 300) {             // If the moisture value is less than 300 lights on green led and turns off others.
    digitalWrite(verde, HIGH);
    digitalWrite(amarillo, LOW);
    digitalWrite(rojo, LOW);
    delay(1000);
  }
  else if(humedad > 300 && humedad < 600){    // If the moisture value is more than 300 but less that 600 lights on yellow led and turns off others..
    digitalWrite(verde, LOW);
    digitalWrite(amarillo, HIGH);
    digitalWrite(rojo, LOW);
    delay(1000);
  }
  else {                                    // Any value more than 600 lights on red led and turns off others.
    digitalWrite(verde, LOW);
    digitalWrite(amarillo, LOW);
    digitalWrite(rojo, HIGH);
    delay(1000);
    
  }
  delay(1000);    //Retardo de 1 segundo antes de iniciar el ciclo nuevamente.
}