Published October 5, 2019 © GPL3+

DIY Humidifier - Grove Water Atomization

Make your own humidifier or scent dispenser using Seeeduino Nano + Grove Water Atomization, keep track of the current humidity with DHT11

BeginnerProtip1 hour9,130

Things used in this project

Hardware components

Seeed Studio Seeeduino Nano

Seeed Studio Grove - Water Atomization v1.0

Seeed Studio Grove - Temperature & Humidity Sensor (DHT11)

Adafruit OLED 128x32

Story

Tutorial video if needed

Hello there, hope you are well, this is a special project featuring Seeed Studio products, today we’re about the Seeeduino Nano and the Grove Water Atomization Module, and we’ll try to make a humidifier out of it using DHT11 and OLED screen to display the current Temperature/Humidity and the humidifier statut, to maintain the room humidity at a certain point.

As this is the first time using the Seeeduino Nano You can check in the video how to add the Seeeduino boards to the Arduino IDE or follow this link to see how on the product wiki page.

And for the atomization process I’ll be using Grove Water Atomization Module, and basically it heats the water using ultrasound and separate the liquid into small droplets to dispense them in the air, and of course you can create your own scent dispenser out of this module.

Please pay attention when using the module !!!If the module is powered do not touch it at all, about 63V is created between two pins on the bottom, and on the top the inductor L2 gets way too hot !!!!

1 / 2 • Do not touch

Parts

In addition of the parts in the pictures below, we'll need some jump wires and a breadboard if you want

1 / 4 • Seeeduino Nano, or any other Arduino compatible board can do

Wirings

The wiring diagrams are below so here are some comments about them.

Wiring 1

So first as we are just trying to setup the module and the board, here’s how to wire them, and as you can see in the video I used the grove cable, as it was very easy, and it wires the module directly to GND 5V and SCL (A5) because the grove connector on the Seeeduino is meant to use i²c devices, but you can use it in this case since it’s the only device I’m using until now !

N.B: The 3rd wire is not connected as you can see in the module (NC) and the 4th one needs only a digital signal to start the module or turn it off.

Also don’t forget to put the ultrasound probe (unit) on the surface of a recipient that contains water and help it with a paper towel so it won’t sink.

Wiring 2

Here is the wiring for the humidifier project, and here I add a DHT11 and OLED i²c display, any humidity sensor will work just use the right code, I’ve used a lot you can check them in the channel.

N.B: Please pay attention to you DHT11 module there are different ones some are soldered on a board with a resistor like the one I’m using, some of them have 4 pins, all pay attention to the pins some are (Signal, Vcc, GND) some are (Vcc, Signal, GND)

For the Atomizer I didn’t use the Grove connector as the OLED uses the i²c interface.

Tests

Test 1

The first test is straight forward, just don’t forget do not touch the sensor board while it’s powered and put a paper towel so the ultrasound unit won’t sink.

1 / 2 • Atomizer Off

Test 2

The second code is for a humidifier project, the DHT11 is reading the humidity every second and as long as the wanted humidity value is not reached it will activate the atomizer, and the current humidity/temperature values are shown on the OLED alongside the Atomizer Statut « On ».

The atomizer will stop once the value is reached.

Improvements/Ideas

You can improve the code by calibrating the DHT11 very well, also you can avoid the On/Off at the set point, by giving it an interval instead of a single value like « 67<h<73 » and the atomizer will work once the value is below 67 and turn off until it reaches 73 and start again if it goes below 67.

You can make a scent dispenser out of it, activated by a push button or automatically (every period/ everytime someone passes by…).

That’s it I hope you like it and thanks again to Seeed Studio for the collaboration.

Code

/* This code works with Grove Water Atomization module
 * It activate the atomizer for 3 seconds and turn it off with a message shown of the statut
 * Refer to http://Surtrtech.com for more details
 */

#define Atomizer A5          //Atomizer EN pin

void setup() {
  
  Serial.begin(9600);
  pinMode(Atomizer, OUTPUT); 
  
}

void loop() {
  
Serial.println("Atomization !!!!");
digitalWrite(Atomizer,HIGH);
delay(3000);

Serial.println("Atomization OFF");
digitalWrite(Atomizer,LOW);
delay(3000);

}

/* This code works with Grove Atomizer, DHT11 and OLED ic display
 * It shows the current temperature and humidity alongside the humidifier statut
 * It constantly read the ambient humidity and try to keep it at a defined humidity level (here is 70%)
 * and it activate the humidifer/atomizer everytime it's necessary to do so
 * Please refer to http://SurtrTech.com for more details
 */

#include "DHT.h"                  //Required libraries for DHT and OLED
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define Atomizer 3       //Atomizer EN pin
#define DHTpin 2         //DHT signal pin
#define DHTTYPE DHT11    //you can use DHT 22...
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
#define OLED_RESET    -1 // Reset pin # (or -1 if sharing Arduino reset pin)

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); //Declaring the display name (display)

DHT dht(DHTpin, DHTTYPE);

void setup() {
  
    Serial.begin(9600);
    dht.begin();
    display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //Start the OLED display
    display.clearDisplay();
    display.display();
    pinMode(Atomizer, OUTPUT);
      
}

void loop() {
 
  float h = dht.readHumidity();         //Reading the humidity/Temperature values, you can calibrate them if you want
  float t = dht.readTemperature();      //You can add true between those brackets to make it Fahrenheit instead of Celsius

  if(h>=70){                           //if the humidity % is equal or above the setpoint (70) the atomizer stops
    digitalWrite(Atomizer,LOW);
    
    }
  
  display.clearDisplay();
  display.setTextSize(2);                    
  display.setTextColor(WHITE);             
  display.setCursor(0,0);                
  display.print("H "); 
  display.print(h,1);
  display.print(" %");
    
    if(h<70){                      //Otherwise it will be on and it will show "On" on the display alongside the current temperature and humidity
    digitalWrite(Atomizer,HIGH);
    display.print("On");
    }
    
  display.setCursor(0,19);                
  display.print("T "); 
  display.print(t,1);
  display.print(" C");
  display.display();
  delay(1000);

}

Credits

SurtrTech

9 projects • 207 followers

YT Channel bit.ly/35Ai76l, run by Automation and Electrical Engineer, Electronics amateur, no IT background so you may see wreckage in codes

DIY Humidifier - Grove Water Atomization

Things used in this project

Hardware components

Story

Parts

Wirings

Tests

Improvements/Ideas

Schematics

Wiring_1

Wiring_2

Code

Grove_Atomizer_direct_test.ino

Humidifier_Grove_Atomizer_DHT11_OLED.ino

Github

Github

Github

Credits

SurtrTech

Comments

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DIY Humidifier - Grove Water Atomization

DIY Humidifier - Grove Water Atomization

Things used in this project

Hardware components

Story

Parts

Wirings

Tests

Improvements/Ideas

Schematics

Wiring_1

Wiring_2

Code

Grove_Atomizer_direct_test.ino

Humidifier_Grove_Atomizer_DHT11_OLED.ino

Github

Github

Github

Credits

SurtrTech

Comments

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