Questions tagged [home-automation]

Home automation is using electronic systems to control appliances and other electrical systems within a house. Examples include automatic switching of lights, air conditioning, security locks and cooking / entertainment appliances.

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63 views

Review of PCB design: ESP32 + 2 Relay design review

I've completed the design of my pool timer that can turn the pump & light on/off via Wifi and would love to get my design reviewed. At 120V; the pool light should handle 500W and the pump is a 0....
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34 views

Linearizing multi-star network for home automation

I'm designing a communication network for private home automation. My design goals are: Local wrt network changes. That is, changing one part of the network should not require modification of the ...
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2answers
68 views

Using back emf for charging window-blind controller battery

Let me start: I have no clue of electric engineering. However, I built an automated window blind controlled by my home automation. It consists of a stepper motor, motor controller board, an ESP8266 ...
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49 views

Single pole or dual pole relay for switching a 3 kW water heater?

I have bought a WiFi controlled device to control a 3 kW, 240 V water heater (immersion heater) wirelessly but despite being advertised as 15 A, it actually has a 13 A relay which has "push fit" ...
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13 views

Lutron MACL-153 with Shelly 1

To sum up my question, can a digital dimmer switch be controlled with a ESP8266 WiFi switch? I don't fully understand how a digital dimmer works and I doubt that just switching the power through a ...
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27 views

Need help in using a solid-state relay with Arduino

Disclaimer: I'm a newbie in electronics, so please pardon my lack of knowledge. I'm trying to automate my water tank filling system with an Arduino Uno. The part I need help with is picking the ...
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1answer
29 views

Running digital ground at AC line potential (not neutral)

I've run across an interesting WiFi dimmer module known as a Shelly dimmer. This bright green module is designed to be used inside an electrical box. Most of it's user interface is over line-...
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1answer
64 views

What size capacitor do I need to reliably close a 1" US Solid motorized ball valve?

I am making a water feature that will involve a stream fed by the basin of a fountain with a pump at the end sending water back into the fountain. To control the water flow rate through the stream and ...
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61 views

Controlling a Wi-Fi relay switch using a “no-neutral” touch wall switch

I'm planning to install touch wall switches in my apartment. They appear to be powered by leaking current through the switched receiver (e.g. a lightbulb) – no neutral connections. I also wanted to ...
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23 views

Wemos D1 Minin Battery Shield Fully Charged Notification

I would like to be able to send a notification via Home Assistant when a battery is fully charged through one of my Wemos D1 Mini Battery Shields (V1.1.0). Clearly the green LED turns on when it is ...
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1answer
68 views

How do I make water tank control circuit?

I would like to make electronic circuit to control water tank. Its works expected as below: Once water inside the tank is lower than its minimum level, then the mechanical sensor A will trigger to ...
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5answers
164 views

How do I read the state of AC switch, through a microcrontroller?

I wanted to read the state of an AC switch using a microcontroller. S1 is an SPST switch and cannot be changed. What circuit will be required for doing this? I'm using this for my home automation ...
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34 views

What does “Current Detection” feature mean in KNX actuators?

I understand that KNX/EIB actuators are used to switch on/off lights in fancier homes. Some of these actuators have "current detection" feature, and some do not. What can that feature do? Is it ...
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46 views

simple design for mechanized home automation devices to stop at limits [closed]

can you point me to any existing designs or ideas for simple DIY type mechanism to ... for example... roll up/ roll down a motorized movie screen and stop when it gets to some specific limits. i ...
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148 views

Using a resistor on one branch of a parallel circuit affects the other branch?

I've wired in one doorbell button to an 18v AC PSU which is working fine, but upon adding a second to the circuit it didn't work properly. I found later that the second type of doorbell needs a '25 ...
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2answers
213 views

Circuit to turn microcontroller on when reed switch state changes (to monitor door lock state)

I'd like to build a circuit that provides power to a microcontroller (ESP8266 in this instance) when a reed switch is changed from closed to open AND when changed from open to closed. This is to be ...
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3answers
206 views

How to monitor switch state?

Background I am building a simple web application using raspberry as a server. I am using this raspberry also to control an arduino. A user can send commands through the browser to the raspberry, and ...
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1answer
447 views

NodeMCU 12E: Using 8 Digital pins 8 Channel Relay

I am trying to connect my 8 Channel Relay to my NodeMCU 12E and use it for automation with Alexa. For digital output I am using the ports: D0,D1,D2,D4,D5,D6,D7,D8 And for power: Relay(VCC) -> ...
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59 views

Water level measurement using Optical Mouse Sensor

I wonder if anyone has hacked an Optical Mouse sensor to measure water level in an overhead water tank? Its possible to read frames data from the sensor and if those frames could be processed with a ...
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1answer
98 views

Best TRIAC for zero cross detection

I already asked this question Triac BT 136 getting shorted when load is given to T1. When I referred this link, I understood rate effect is the root cause for our problem. To avoid this either we ...
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2answers
62 views

Faucet valve control

I'm a mechanical engineer with very few knowledge in electrical so your help is very appreciated. I'm doing a small project which require to automatically the fill and empty a sink. How can I ...
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2answers
243 views

Automatic switch for shop vacuum

I have just finished build my table saw and now planning for integrated vacuum system for dust collection. I've designed the circuit to detect if saw motor is switched on and automatically switch ...
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1answer
44 views

Multiple lights dimming using single TRIAC zero detcetion module

We know well we can dim single lights using single TRIAC module with the help of PWM signals from controller. My question is, I want to control the lights which are placed on hall. Let us consider 15-...
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1answer
78 views

How would I open a Doorking gate and tell if it's open or not with an Arduino? [closed]

I'm a software guy trying to get into hardware with home automation, and I have an Arduino and I was wondering how the electrical circuit would look/function. The manual is here: https://www.doorking....
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300 views

How to get NodeMCU to detect an external switch closure of an unknown voltage?

I'm getting really into home automation as a side project of mine and one of the next things I would love to automate is my doorbell. Short question: If I have a switch (momentary button in the form ...
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2answers
3k views

Auto turn off switch during power outage

In my area power outages are a daily routine. And power surges, which occur when the electricity comes back, makes it even worse. To avoid damage of the electronic devices we try to unplug them ...
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1answer
43 views

Automatic Switching

I have a system that is powered by 5V and 9V, I have two supplies one is from a solar panel with an output of 9V dc and another one is a USB with an output of 5V. During the day the system is using ...
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2answers
593 views

Controlling millivolt fireplace with Wi-Fi wall switch

My whole house is setup with Wi-Fi wall switches. They're just like basic 110V wall switches, but they can be controlled via Wi-Fi. I'm in the U.S. I'd now like to enable my fireplace. The fireplace ...
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1answer
957 views

How to modify a 433.92 MHz signal to a 434 MHz signal?

I have these remote controlled wall outlets (Brennenstuhl Funkschalt-Set RCS 2044 N Comfort). And I'm trying to make an arduino circuit with an RF transmitter so I can switch them on and off without ...
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1answer
63 views

running multiple loops simultaneosly

I tried google, youtube, stackexchange but couldn't find a proper answer. I am trying to design a home automation system with arduino which need to control a fan and a light. Simply activating a relay ...
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1answer
84 views

Delaying part of circuitry

I am trying to design a board controlling the powering up of an Esp8266 with the following features low consumption power on at fixed interval (kind of a heartbeat) power on, when an edge is detected ...
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1answer
43 views

2 wire to 3 wire system for ZWave

I’m looking at installing a zwave system in the UK. The relays I want use require a 3 wire system. They say most of the uk is wired via a 2 wire system This is the product http://www.vesternet.com/z-...
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211 views

What is the best way automated relay switches can work with manual switches for a two way skylight motor?

I am installing a pair of skylights and considering if I could automate them with a Raspberry pi. The same could apply to windows or blinds, so I am hoping someone has done similar. Is this a safe ...
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1answer
219 views

Calculation of active power and apparent power through sampling

I'm currently working on a power meter device based on simultaneous sampling of current and voltage values, I intend to use this system to measure the active, reactive and apparent power on a non-...
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1answer
397 views

Device to programmatically controlled USB relay/switch [closed]

(Edited to remove shopping question. I don't need recommendation of a specific product as much as I would like to know what such a device would be called.) I'm know more about programming than I do ...
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1answer
181 views

If an incandescent light is rated for 60 watts, can a LED lamp cause an amperage or heat issue in the fixture/enclosure? [closed]

This question is based on the adage "it's the amperage that kills you"... but in this case I don't want to start a fire. I have a Philips white and color light that I would like to put in a ceiling ...
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1answer
271 views

How can I power a load from two separate circuit breakers?

On one circuit breaker I have a manual switch. On the second circuit breaker I have a motion sensing switch (using a mechanical relay). I have a number of lights wired in parallel as the load. The ...
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1answer
378 views

Crestar remote control operating frequency

I have tried very hard to find the frequency that my remote is using. I've took pictures of the inner board and the remote. Please help or guide me on how I could find the frequency.
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0answers
409 views

Reverse Engineering Panasonic AC Remote Control Circuit [closed]

I have a Panasonic air conditioner which comes with a wired remote controller CZ - RD513C attched to the wall and has no infrared. I want to make a circuit connecting to STM32F746 to automate the ...
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1answer
448 views

ESP32 is safe enough to control a door lock

It is safe to use an ESP32 (specifically DevKitC) to control a Home door lock using a relay module (or maybe a power MOSFET)? Supposing that the ESP32 is running a safe and bugfree software. on the ...
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3answers
5k views

Control Simple RGB LED Light Strip With ESP-01 Using Homebridge

What I am trying to do is control a simple 2m 5050 RGB Led Light Strip though a ESP-01 that receives http requests through Homebridge. I am doing this through the better-http-rgb Homebridge plugin and ...
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2answers
214 views

Transistor not switching [closed]

I've got a 2N3904 hooked up to a pin on a NodeMCU Board (3.3V logic). I am trying to short the button contacts on a fan remote to trigger the speed and such, however, when I pull the base high (3.3V) ...
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3answers
348 views

Sending digital sensor ouput over cable upto 30meters

Description: This is a DIY home automation project to use a touch panel to control mains lights. I am using a Capacitive Touch Breakout board for the AT42QT1010 touch sensor IC (see references below)...
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1answer
200 views

Are there any problems with my circuit design?

I am new to designing circuits but I have spent a lot of time researching for this project. I have been designing an automated indoor garden for my home. To save space, there will be 3 gardens stacked ...
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1answer
64 views

Home automation/AI - welcome message

This is a home automation/AI project that I am currently figuring out details for, and currently I'm trying to figure out a way that i can detect which direction someone is walking through a door so ...
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2answers
489 views

How would I use an arduino to detect the state of a dimmer switch?

I have an AC Dimmer Switch you'd normally put in a gang box and use to dim lights in your house. If I wanted to hook up this switch to an Arduino (and JUST an Arduino, NOT mains voltage), how would I ...
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2answers
594 views

Can I use a standard latching relay to switch AC for a power socket?

I'd like to remotely control a power socket. I'd like to create a circuit that opens and closes a relay, effectively turning the socket on and off. I can handle the logic and the DC, but I'm less ...
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1answer
117 views

Relay stays triggered (latched) with 2 sec interval, 50% duty cycle signal

While building a home automation system, I triggered my 5V relay through the Arduino (running the blink code, 1 second ON 1 second OFF), however my relay stays in the triggered state. Due to which the ...
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3answers
1k views

Latching relay - Remember state after power failure [closed]

first off this is my second question here so pardon me for any blunders. I am trying to use a relay to control appliances. My arduino will trigger the relay on/off. Additional requirement is in case ...
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1answer
1k views

Automatically opening and closing a door

I'm working on an automatic door that runs like this: Receives an input trigger, probably a voltage input DC motor runs in one direction for x seconds to open the door Same DC motor reverses ...