Learn HYDRUINO with Real Code Examples

#include <Hydruino.h>

void setup() {
    pinMode(13, OUTPUT)
}

void loop() {
    digitalWrite(13, HIGH)
    delay(1000)
    digitalWrite(13, LOW)
    delay(1000)
}

A simple Hydruino sketch that blinks an LED connected to pin 13.

#include <Hydruino.h>

void setup() {
    pinMode(13, OUTPUT)
    pinMode(2, INPUT_PULLUP)
}

void loop() {
    if(digitalRead(2) == LOW) {
        digitalWrite(13, HIGH)
    } else {
        digitalWrite(13, LOW)
    }
}

Turns an LED on when a button connected to pin 2 is pressed.

#include <Hydruino.h>

void setup() {
    pinMode(9, OUTPUT)
}

void loop() {
    for(int i=0; i<=255; i++) {
        analogWrite(9, i)
        delay(10)
    }
    for(int i=255; i>=0; i--) {
        analogWrite(9, i)
        delay(10)
    }
}

Fades an LED in and out using PWM on pin 9.

#include <Hydruino.h>

void setup() {
    pinMode(8, OUTPUT)
    pinMode(9, OUTPUT)
    pinMode(10, OUTPUT)
}

void loop() {
    digitalWrite(8, HIGH)
    delay(3000)
    digitalWrite(8, LOW)
    digitalWrite(9, HIGH)
    delay(1000)
    digitalWrite(9, LOW)
    digitalWrite(10, HIGH)
    delay(3000)
    digitalWrite(10, LOW)
}

Simulates a traffic light sequence with three LEDs on pins 8, 9, and 10.

#include <Hydruino.h>

void setup() {
    pinMode(6, OUTPUT)
}

void loop() {
    tone(6, 440, 500)
    delay(1000)
}

Plays a tone on a buzzer connected to pin 6.

#include <Hydruino.h>

void setup() {
    pinMode(6, OUTPUT)
    pinMode(2, INPUT_PULLUP)
}

void loop() {
    if(digitalRead(2) == LOW) {
        tone(6, 523)
    } else {
        noTone(6)
    }
}

Turns on a buzzer while a button on pin 2 is pressed.

#include <Hydruino.h>
#include <Servo.h>

Servo myServo

void setup() {
    myServo.attach(9)
}

void loop() {
    for(int pos=0; pos<=180; pos++) {
        myServo.write(pos)
        delay(15)
    }
    for(int pos=180; pos>=0; pos--) {
        myServo.write(pos)
        delay(15)
    }
}

Moves a servo connected to pin 9 back and forth.

#include <Hydruino.h>

void setup() {
    pinMode(9, OUTPUT)
}

void loop() {
    int val = analogRead(A0)
    analogWrite(9, val/4)
    delay(10)
}

Controls LED brightness with a potentiometer on pin A0 and LED on pin 9.

#include <Hydruino.h>

void setup() {
    pinMode(9, OUTPUT)
    pinMode(10, OUTPUT)
    pinMode(11, OUTPUT)
}

void loop() {
    digitalWrite(9, HIGH)
    delay(500)
    digitalWrite(9, LOW)
    digitalWrite(10, HIGH)
    delay(500)
    digitalWrite(10, LOW)
    digitalWrite(11, HIGH)
    delay(500)
    digitalWrite(11, LOW)
}

Cycles through colors on an RGB LED using pins 9, 10, and 11.

#include <Hydruino.h>

void setup() {
    pinMode(13, OUTPUT)
}

void loop() {
    // S: ...
    for(int i=0;i<3;i++) {
        digitalWrite(13, HIGH)
        delay(250)
        digitalWrite(13, LOW)
        delay(250)
    }
    // O: ---
    for(int i=0;i<3;i++) {
        digitalWrite(13, HIGH)
        delay(750)
        digitalWrite(13, LOW)
        delay(250)
    }
    // S: ...
    for(int i=0;i<3;i++) {
        digitalWrite(13, HIGH)
        delay(250)
        digitalWrite(13, LOW)
        delay(250)
    }
    delay(2000)
}

Flashes an LED on pin 13 in Morse code for 'SOS'.