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Arduino - Rain Sensor - Servo Motor
We will learn:
- If the rain is detected, rotate servo motor to 90 degree
- If the rain is not detected, rotate servo motor back to 0 degree.
Hardware Required
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
Disclosure: Some links in this section are Amazon affiliate links. If you make a purchase through these links, we may earn a commission at no extra cost to you.
Additionally, some links direct to products from our own brand, DIYables.
Additionally, some links direct to products from our own brand, DIYables.
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
This image is created using Fritzing. Click to enlarge image
Arduino Code - Rain Sensor Controls Servo Motor
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-rain-sensor-servo-motor
*/
#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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