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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Automatic Timer Solar Cutoff [migrated]

My inverter insists on trying to get the last few rays, even when the inverter is really seeing 0A. With the lithium battery things are worse, in that the custom "back to grid" settings are ...
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-3 votes
1 answer
88 views

12V-only (and no 110V/220V) household electrical installation [closed]

Power outlets are in 220V/110V in houses for historical reasons (light bulbs and other appliances probably required >100V voltage) but nowadays as: we use a USB charger 220V->5V for phones, ...
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Wiring 4-wall outlets in parallel

I would just like to ask if my wirings for a power control box is correct. I am planning to power 4 independent outlets to actuate pumps and other devices on mains, and control these independent ...
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LED power usage and wiring

I'm a total beginner in electronics work and I have some questions. I would like to fix an LED strip to the bottom of a ~2 m long IKEA shelf. I would like two runs on the bottom (one at the back of ...
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Home automation using CAN bus

I am planning to make a prototype for wired home automation devices, and I am thinking of using CAN bus for communication between nodes and Gateway. The way I am planning to build it, there is one ...
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Shelly1 wiring 110v sw for buzzer along with door opener

I’ve got shelly1 wired up to allow me to remotely open my door. I’m trying to see if I can use SW to detect the buzzer (along with a custom circuit). Here’s what I have without door buzzer detection: <...
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Smart Power Restore Alarm

I have a portable generator I am going to use with an interlock system, which prevents back current to the grid, to power the house during outages. Knowing I would need a power return alarm to notify ...
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1 vote
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Smart watchdog water alarm critique and questions

I've developed a smart circuit for the watchdog water alarm (teardown here)and I am ready to have PCBs made up. Before I do so I would like to get everyone's critique and as an amateur I do have a few ...
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Easy way to get TRIAC dimming onto a typical LED strip?

I’m trying to build a light fixture which uses a 24V 30W LED strip that can be connected through mains power to a typical Lutron TRIAC wall dimmer. I can’t seem to find any type of driver product ...
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1 answer
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No deflection in voltage regulator but the circuit works fine [closed]

I have connected a voltage regulator (range 0- 300V) to my Air conditioner. The Air conditioner has three wires neutral,live and Earth. (I doubt if the connection is right). The Air conditioner turns ...
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Home Automation Sensor Circuit Unexpected State

I embarked in a DIY project to replace a burnt home automation controller with a solution based on a Raspberry Pi using its GPIO inputs and outputs. I designed and built the electronics using ...
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2 answers
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Efficient temperature control for a growbox

I am making a growbox controller. It has (among other things) a heater and a temperature sensor. Heater has no temperature controls, it can be turned on/off. The objective is to maintain temperature ...
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2 answers
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troubles getting serial port tv to work

i recently posted a question, but didn't had an answer (my fault :) ). my question wasn't straight-forward and clear. so my final goal is to communicate between nodered (raspberry-pi) and my lg tv. I'...
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1 vote
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Why don't LG RS232 commands work when the TV is on (only responds when off)?

I'm writing a new question after stumbling across this question which appeared to have similar symptoms: LG RS232 Commands partially working. As the other question noted, the power on command ...
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How can I ramp up the start of a motor?

I recently have had electrical roller shutter installed on my windows. They are wired (I put a home automation system behind, based on Shelly 2.5 (wiring)). It works great, except that the motor, when ...
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Can I use an RIBU1C to switch a 110v fan?

I recently set up a millivolt switched gas heater with an Ecobee3 thermostat. I used an RIBU1C relay to accomplish this (Ecobee wants to switch a 24VAC circuit, and the gas heater wants a millivolt ...
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1 answer
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How to know the status of a two way switch through MCU

My project is this one that I asked earlier (except the fact that I'll be using SPDT switches) Two way lighting What I'm asking can the MCU detect if the circuit is closed (whether by the physical ...
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1 answer
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How should I connect the RX and TX pins of an Arduino to a Bluetooth module?

I am working on an Arduino based Bluetooth controlled home automation using a mobile app. When I power ON the circuit, it works fine but when I power it OFF and power it ON again I have to remove the ...
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Relay and wifi module

I'm a beginner in electronics and I am trying to do a "connected switch" with a relay and a wifi module ESP8266, but the thing is that to power the wifi module I need a second power supply ...
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2 answers
311 views

Relay parallel to wall switch: Is it safe?

I am currently working on a home automation project and I have the low power electronics sorted out. My setup requires me to connect a relay to the light which is simple but my design requires me to ...
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0 votes
1 answer
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How can I electically isolate two sprinkler controllers 24VAC working on the same output (master valve)

I have an old 24 zone sprinkler controller and I'm trying to move 16 zones to a "smart" sprinkler controller. I have a master valve that has to be switched on to provide water downstream to ...
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Is printing a PLA box for electronic components safe?

not sure I'm in the good place. I'm working on a small project, building a connected light dimmer for my home. I'm using a raspberry pi zero and an AC dimmer (this one : Universal AC MAINS Dimmer - ...
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-2 votes
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Automation panel: what would cause a 135v input voltage?

I am building a home automation panel which is fed by 120v AC input mains power. The first connection in the panel is a GFCI breaker followed by 5v and 12v switched PSUs which power a relay board and ...
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4 votes
2 answers
235 views

Relay contact insulation doesn't seem to be enough

I'm working with an ESP32 and a 4 relay module. The problem seems to be that the insulation of contacts in the relay is not enough. Relays close perfectly and my lights turn on, but when they open, a ...
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1 answer
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Feedback requested for my circuit (automated brewery)

I am building an automated fermentation controller for a brewery which integrates 110V and runs an Arduino with respective sensors and other valves. Can you offer any feedback on my overall schematic ...
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2 votes
1 answer
88 views

Using a wifi dry contact module (Sonoff) to increase/decrease temperature in a gas water heater touchpad

I'm a total newbie in electronics, and just started venturing in home automation. In Brazil there are many different types of tankless water heaters, especially for bathroom faucets and shower. Mine ...
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How do I know if it's safe to connect the common grounds of the input signals of two garage door openers?

I have two Hormann ProMatic garage door openers, identical ones, both have a pair of built-in input connectors where anyone can use an external switch to trigger the garage doors to open/close. My ...
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0 votes
1 answer
138 views

Microcontroller driving a 12 VAC relay - with as few components as possible

I want my ESP8266 to drive eight relays with 12 VAC coils for my home automation system. This is not a duplicate of this question because there's an additional catch - I have strict space constraints ...
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3 answers
769 views

How to automatically turn off a Fan after a fixed amount of time?

I have an exhaust fan in my bathroom (used for removing the steam generated by a hot bath). Currently, it can be turned on and off by a regular switch. My goal: Exhaust fan should automatically turn-...
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1 vote
3 answers
121 views

Two-phase system for a smart house?

First I apologize for my ignorance regarding electrical matters. I am analyzing a dataset from a smart house. Some of the power measurements are divided into phase A and B. Their values are somewhat ...
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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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3 votes
1 answer
83 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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2 answers
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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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1 answer
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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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2 votes
1 answer
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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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1 vote
1 answer
143 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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0 votes
0 answers
147 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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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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2 votes
5 answers
235 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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0 votes
1 answer
50 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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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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2 votes
3 answers
620 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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0 votes
4 answers
580 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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0 votes
1 answer
673 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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1 vote
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78 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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1 answer
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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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2 answers
80 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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1 vote
2 answers
543 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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-2 votes
1 answer
59 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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-1 votes
1 answer
88 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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