Arduino - Rain Sensor - Servo Motor

We will learn:

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Rain Sensor
1×Servo Motor
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

Or you can buy the following sensor kits:

1×DIYables Sensor Kit (30 sensors/displays)
1×DIYables Sensor Kit (18 sensors/displays)
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.

About Servo Motor and Rain Sensor

If you do not know about servo motor and rain sensor (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Arduino Rain Sensor Servo Motor Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino Code - Rain Sensor Controls Servo Motor

/* * Created by * * This example code is in the public domain * * Tutorial page: */ #include <Servo.h> #define RAIN_SENSOR_PIN A0 // Arduino pin connected to rain sensor's pin #define SERVO_PIN 9 // Arduino pin connected to servo motor's pin Servo servo; // create servo object to control a servo // variables will change: int angle = 0; // the current angle of servo motor int prev_rain_state; // the previous state of rain sensor int rain_state; // the current state of rain sensor void setup() { Serial.begin(9600); // initialize serial pinMode(RAIN_SENSOR_PIN, INPUT); // set arduino pin to input mode servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object servo.write(angle); rain_state = digitalRead(RAIN_SENSOR_PIN); } void loop() { prev_rain_state = rain_state; // save the last state rain_state = digitalRead(RAIN_SENSOR_PIN); // read new state if (rain_state == LOW && prev_rain_state == HIGH) { // pin state change: LOW -> HIGH Serial.println("Rain detected!"); servo.write(90); } else if (rain_state == HIGH && prev_rain_state == LOW) { // pin state change: HIGH -> LOW Serial.println("Rain stopped!"); servo.write(0); } }

Quick Steps

  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Move your hand in front of sensor
  • See the change of servo motor

Video Tutorial

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