# Electronic Controller for Ultrasonic Humidifier Project

**URL:** <https://forum.core-electronics.com.au/t/electronic-controller-for-ultrasonic-humidifier-project/10454>\
**Category:** Uncategorized\
**Created:** [16 June 2021 02:40 UTC](https://forum.core-electronics.com.au/t/electronic-controller-for-ultrasonic-humidifier-project/10454 "2021-06-16T02:40:29Z")\
**Posts on this page:** 3\
**Page:** 2

<div class="post-metadata">

**Author:** ![Paul166248](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/paul166248/32/4592_2.png) [@Paul166248](https://forum.core-electronics.com.au/u/Paul166248)\
**Post date:** [26 July 2021 02:16 UTC](https://forum.core-electronics.com.au/t/electronic-controller-for-ultrasonic-humidifier-project/10454/21 "2021-07-26T02:16:00Z")

</div>

Hi Trent, hope you are well and staying COVID safe. Terrible time at the moment.

Mate, I was wondering if you were able to assist with a diagram showing the two controllers and how they will interact in order to assist electrician up with the plan. Also, as you indicated,

_Arduino to disable the nebuliser where we will have two relays in series to act as an AND gate, so both controllers are needed to enable the nebuliser (and either can shut it down)._

![image001.jpg](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/f/f003192a1f3cbff81737c51a6c1ed5f5dd97394e.jpeg)

---

<div class="post-metadata">

**Author:** ![Trent5487676](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/trent5487676/32/4583_2.png) [@Trent5487676](https://forum.core-electronics.com.au/u/Trent5487676)\
**Post date:** [27 July 2021 23:28 UTC](https://forum.core-electronics.com.au/t/electronic-controller-for-ultrasonic-humidifier-project/10454/22 "2021-07-27T23:28:46Z")

</div>

Hi Paul,

I’m doing well, my biggest worry at the moment is my glasses fogging up with my mask, so overall things are pretty good.

The circuit you are trying to implement is a **logical AND gate** using relay logic, I’ll link a tutorial below which explains the basics.

> **[Introduction to Relay Logic Control - Symbols, Working and Examples](https://circuitdigest.com/tutorial/introduction-to-relay-logic-control-symbols-working-and-examples)**
>
> Introduction to Relay Logic Control - Symbols, Working and Examples

I’ve got a few other tasks this morning but I’ll find some time later to draw up a diagram for your circuit.

EDIT: Here is the gist of how your system will detect a low water level and cut the power if there is an alarm. The dehumidifier power supply will only have power if both the fridge controller contacts and Arduino relay contacts are closed.

 ![dehumidifier diagram](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/d/d5c5fbfe85c561443739e59906d471f19e49a97b.png)

I’d recommend this relay as suitable as long as your dehumidifier is a 48A AC power supply. This relay will not work with a DC load. [https://core-electronics.com.au/solid-state-relay-40a-3-32v-dc-input.html](https://core-electronics.com.au/solid-state-relay-40a-3-32v-dc-input.html)

---

<div class="post-metadata">

**Author:** ![Paul166248](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/paul166248/32/4592_2.png) [@Paul166248](https://forum.core-electronics.com.au/u/Paul166248)\
**Post date:** [29 July 2021 01:50 UTC](https://forum.core-electronics.com.au/t/electronic-controller-for-ultrasonic-humidifier-project/10454/23 "2021-07-29T01:50:48Z")

</div>

Thanks Trent. Yes it is terrible when you wear glasses…lol

[Previous page](https://forum.core-electronics.com.au/t/electronic-controller-for-ultrasonic-humidifier-project/10454.md?page=1)