Ultrasonic essential Oil diffuser

[fifipil909]

Hi,

my wife like to use essential oil in the house, but basic humidifier use a lot of water and increase the ambiant humidity in the room.
I notice also that the smell of the oil is not really intense.

So the idea, modify a cheap ultrasonic humidifier and create an oil diffuser without dealing with water.

The start, a cheap Donut humidifier 6$ on ebay.

http://www.ebay.com/itm/Donut-Shaped-Ultrasonic-USB-Humidifier-Air-Essential-Oil-Purifier-Aroma-Diffuser-/301652283655?hash=item463be09107:g:vrwAAOSwBahVbrHo

then, I decide to build a wood enclosure with a removable top for easy oil bottle changing and put everything together.

The top is maintain by 2 small magnet, and the ceramic caps just touch the top of the Bottle wick.

Regarding the Sketch, Its like a dimmer, V_status for the On/Off state, V_percentage for the frequency.

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 */

//#################
// INCLUDE
//#################
#include <SPI.h>
#include <MySensor.h>
#include <Time.h>

//#################
// OPTION
//#################

#define DEBUG
#define MIN_DELAY  10   
#define MAX_DELAY  90 
bool  Diffuser_status;
uint8_t   Diffuser_Freq;

int delaytowait;
unsigned long lastUpdate;
int nbseconds = 0;

//#################
// CHILD ID
//#################
#define CHILD_ID_DIFFUSER 0


//#################
// PIN DEF
//#################
#define DIFFUSER_PIN A3


//#################
// VAR
//#################
MySensor gw;

//#################
// Messsage Settings
//#################
MyMessage IntensityMsg(CHILD_ID_DIFFUSER, V_PERCENTAGE);
MyMessage StatusMsg(CHILD_ID_DIFFUSER, V_STATUS);

void setup()
{
  gw.begin(incomingMessage, AUTO, false);
  pinMode(DIFFUSER_PIN, OUTPUT);
  digitalWrite(DIFFUSER_PIN, HIGH);

  //#################
  // Info
  //#################
  gw.sendSketchInfo("Difuser", "1.0");


  //#################
  // Send Presentation
  //#################

  gw.present( CHILD_ID_DIFFUSER, S_DIMMER );

  Diffuser_status = gw.loadState(5);
  Diffuser_Freq = gw.loadState(8);
  gw.send(StatusMsg.set(Diffuser_status ? true : false), true);
  gw.wait(200);
  gw.send(IntensityMsg.set(Diffuser_Freq),true);
}

void loop()
{
  unsigned long now = millis();

  gw.process();

  if (now - lastUpdate > 1000) {
    nbseconds++;
    lastUpdate = now;
  }

  float delaytowaittmp = ((MAX_DELAY - MIN_DELAY) / 100.0) * Diffuser_Freq;
  int delaytowait = delaytowaittmp;

  if ((Diffuser_status == true) && (nbseconds > delaytowait)) {
   
    digitalWrite(DIFFUSER_PIN, LOW);
    delay(100);
    digitalWrite(DIFFUSER_PIN, HIGH);
    delay(100);
    digitalWrite(DIFFUSER_PIN, LOW);
    delay(100);
    digitalWrite(DIFFUSER_PIN, HIGH);
    delay(100);
    nbseconds = 0;
  }else if(nbseconds > delaytowait)
  {
    nbseconds = 0;
  }

}

void incomingMessage(const MyMessage &message) {

  if (message.type == V_STATUS || message.type == V_PERCENTAGE) {

    int req_status = -1;
    int req_percentage = -1;

    if (message.type == V_STATUS)
    {
      req_status = message.getBool();
      Diffuser_status = req_status;
      gw.saveState(5, Diffuser_status);
    }

    if (message.type == V_PERCENTAGE)
    {
      req_percentage = message.getByte();
      Diffuser_Freq = req_percentage;
      gw.saveState(8, Diffuser_Freq);
    }

  }
}

Now, you can have good smell in every room for some dollars when you arrived from work, when you start cooking, when going to sleep or entering in your Bat Cave !

[hek]

Wow, I didn't see that actuator coming.

[MikeF]

...think we need a new sensor type: V_ESSENTIAL_OIL_DIFFUSER

[gregl]

@fifipil909 That's outstanding work!

I never knew these ultrasonic essential oil diffusers existed.

for version 2 you need to add a sensor for when the oil is depleted!

What sort of current does the ultrasonic humidifier demand?

[tripy]

The enclosure is very nice too.
Hand made ?

[fifipil909]

@gregl yes, I think about add a level indication by using a simple ldr and a led, shouldn't be complicated to archeve.

regarding the ceramic caps, a lot of them you can find on ebay use 40 Vac at 1.6Mhz. so not so easy and finding a 8:1 transformer working at this frequency to make a small DC to AC converter is not that easy.

after some search, I find some other caps like exactly the same there is on this "donut" humidifer. they are working at a much low frequency, 113khz to be exact.
http://fr.aliexpress.com/item/20mm-113KHz-ultrasonic-atomizer-transducer-atomizing-part/32273063940.html?spm=2114.44010308.4.177.0Amsoy
Regarding the voltage, I found some caps working at 5vpp but the donut caps seems to working arround 50v.
I don't have any idea how they boost the voltage to that pick.

here is some scope:

Mofset Gate :

Caps input:

the sinus wave it's really durty, but seems to be enough to vibrate the caps.

donut IC :

if someone have some idea of what is this black component on the right side. seems to be the one that boost the voltage up to 60v.

@tripy yes everything handmade. my friend carpenter help me to glue together some piece of wood plate like this : http://planete-bois.com/plans-de-travail/28-plan-de-travail-chene-lamelle-colle-aboute.html I manage the rest with a router and a drill press.

[gregl]

"what is this black component on the right side"
id say its a simple transformer. how many leads go into it? ( photos a bit blurry )

[AWI]

@fifipil909 I assume the black component is a coil. There are many simple circuits which can generate a high voltage with a coil/ transformer or capacitors and diodes.
Some noisy examples

[fifipil909]

There is 3 leads.
I did try to make better pic.

[lucyheart]

Wow... you're resourceful persion. i want build this but it difficult for me

[fifipil909]

Hi,

It's hard to say right now.
It can be interesting to know how do you control the On/Off.

Those Ceramic caps don't like to be used without any liquid and can be damaged very quickly if there are dry.
But normally there is a build in switch off circuit if no liquid is detected.

Can you tell me more how to you modify the electronic to control it with Mysensors ?