Published November 27, 2022

Automatic Humidifier

An automatic humidifier makes your winter more comfortable

BeginnerProtip6 hours649

Things used in this project

Hardware components

Seeed Studio Grove - Water Atomization

Seeed Studio Seeeduino XIAO Expansion board

https://www.seeedstudio.com/Seeeduino-XIAO-Expansion-board-p-4746.html?queryID=81765fc1ffb5ff0652d22358b0740401&objectID=4746&indexName=bazaar_retailer_products

Seeed Studio XIAO SAMD21 (Pre-Soldered) - Seeeduino XIAO

Seeed Studio Grove - Temperature&Humidity Sensor(DHT11)

Seeed Studio Grove - RGB LED Ring (16-WS2813 Mini)

Story

Motivation

Many people get dry throats, and itchy skin and some even experience nosebleeds every morning due to the unusually dry winter air and the use of heating equipment. By appropriately raising air humidity, several respiratory disorders can be prevented from developing. This project measures the temperature and humidity in your room or workplace to determine whether they are within a comfortable range. If it determines that the relative humidity is below the necessary threshold, it activates the humidifier.

1. Software setup

Step 1. Download and Install the latest version of Arduino IDE according to your operating system

Step 2. Launch the Arduino application
Step 3. Add Seeed Studio XIAO board package to your Arduino IDE

Navigate to File > Preferences, and fill in"Additional Boards Manager URLs" with the URL below: https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

Navigate to Tools > Board > Boards Manager..., type the keyword "XIAO " in the search box, select the latest version of the board you want, and install it. You can install both.

Step 4. Select your board and port

Board

After installing the board package, navigate to Tools > Board and choose the board you want, continue to select "Seeed XIAO ". Now we have finished setting up the Seeed Studio XIAO for Arduino IDE.

Port

Navigate to Tools > Port and select the serial port name of the connected Seeeduino XIAO. This is likely to be COM** or higher

Step 5. Navigate to File > Examples > 01.Basics > Blink to open Blink example

Step 6. Click the Upload button to upload the Blink example code to the board

Once uploaded, you will see the built-in red LED blinking with a 1-second delay between each blink. This means the connection is successful and now you can explore more projects with the Seeeduino XIAO!

2. Hardware setup

Connect XIAO on the expansion board and the rest groves with the following pinout schematic.

3. Coding

Please refer to the code part for more details.

4. Note

Take a cup, add some tissue to the water, and keep in mind that the side with the hollow on the bottom is the side that should face downward. Keep the top side of the transducer plate above water and let the bottom descend into the water. Tissue has two purposes: it directs water to the transducer and keeps the transducer's upper side above water.

5. Project demo

Code

// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
#include "Adafruit_NeoPixel.h"
#ifdef __AVR__
  #include <avr/power.h>
#endif

#define PIN            7
// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS      20
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#include "DHT.h"

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT11   // DHT 22  (AM2302)
//#define DHTTYPE DHT21   // DHT 21 (AM2301)
//#define DHTTYPE DHT10   // DHT 10
//#define DHTTYPE DHT20   // DHT 20

/*Notice: The DHT10 and DHT20 is different from other DHT* sensor ,it uses i2c interface rather than one wire*/
/*So it doesn't require a pin.*/
#define DHTPIN 5     // what pin we're connected to（DHT10 and DHT20 don't need define it）
DHT dht11(DHTPIN, DHTTYPE);   //   DHT11 DHT21 DHT22
 
int delayval = 500; // delay for half a second



#if defined(ARDUINO_ARCH_AVR)
    #define debug  Serial

#elif defined(ARDUINO_ARCH_SAMD) ||  defined(ARDUINO_ARCH_SAM)
    #define debug  SerialUSB
#else
    #define debug  Serial
#endif
// Pin Definitions   

// Variable Definitions
int sensorValue = 0;  

void setup() {
    Serial.begin(9600);
    pinMode(0,OUTPUT); //Set pin 4 as OUTPUT pin
    dht11.begin();

#if defined (__AVR_ATtiny85__)
  if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
  // End of trinket special code
  pixels.setBrightness(255);
  pixels.begin(); 

  
    
}
void loop() {
    // read the value from soil moisture sensor:
    sensorValue = dht11.readHumidity();
  
    Serial.println(sensorValue);

    // determine when to open the relay:
    if(sensorValue<90){
      digitalWrite(0,HIGH);
           
    for(int i=0;i<NUMPIXELS;i++){
 
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(0,150,0)); // Moderately bright green color.
 
    pixels.show(); // This sends the updated pixel color to the hardware.
 
    delay(10); // Delay for a period of time (in milliseconds).
 
  }
    }
    
    else{
      digitalWrite(0,LOW);
           
    for(int i=0;i<NUMPIXELS;i++){
 
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(0,150,150)); // Moderately bright green color.
 
    pixels.show(); // This sends the updated pixel color to the hardware.
 
    delay(10); // Delay for a period of time (in milliseconds).
 
  }
      
    }
    //read the value every 10 minutes
    delay(10);
}