Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [smart]

36 questions
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Connecting S1 and S2 on SONOFF Mini to 230V

Can I connect 230V to S1 and S2 on the SONOFF Mini? User manual: http://dl.itead.cc/mini/MINI-user-manual%20V1.0.pdf
Magnus
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APC Smart UPS - 2700uF 40V Capacitors

Please excuse the possibly simple question but this is all a bit new to me. I have an APC Smart UPS 1000 which has a very large/tall 2700uF 40V capacitor on the battery (24V) connector. Not knowing how good all the capacitors are and having already…
MBP
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Why does S.M.A.R.T work the way it does?

According to Wikipedia : S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology; often written as SMART) is a monitoring system included in computer hard disk drives (HDDs), solid-state drives (SSDs), and eMMC drives. Its primary function…
KenobiBastila
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Altium paste component at a new pattern shape( like circular or ...)

I need to past the component in PCB part automatically in one new pattern shape,So is there any why to draw pattern and paste component in that pattern automatically by Altium ( similar to align option but in new pattern type)? thanks a lot.
Soheil Paper
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How do you calculate the VA value of a relay?

For my capstone project I am building an outlet which can be controlled using WiFi signals. I am having trouble finding a suitable relay for this device. The relay I first used was a latching relay (399-11009-1-ND).. but it only had a maximum…
user134923
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Trying to read serial communication from smart meter with Arduino

First my compliments for this wonderful site. I'm hoping to find an answer to my problem. I've checked to find answers, however was not able to find it. My background is somewhat technical, only with minor electrical knowledge. My project goal is to…
Vernon
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Modem to Modem via GPRS

I am working on a GPRS communication design. What I want to do to connects two modems together via GPRS. But I found that i could not connect. I was able to connect both modems to the internet using TCP connection AT Commands, and able to establish…
Paul A.
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Smart switch on 240 V circuit?

I plan on installing an outdoor heater that takes a 220 V power supply. Each side of the 220 V circuit powers one element in the heater, for a total of two elements. Can I put a smart switch on each hot feed in the 220 circuit, use the common…
BobbyS
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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 me when the power is restored I made something…
Hartman9
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Smart meters setup

I want to monitor my exported solar energy. The solar inverter (L1+N) is already connected to my mains power meter (grid) through a smart meter (SDM630), which in return, transmit RS485 data back to the inverter. Now, I want to power on a water…
Brian Petersen
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Smart light switches and 2-way switches

I am looking at having my dumb (3 and 4 gang) switches upgraded to smart switches. The biggest issue I foresee is that one of the switches is a 2-way switch. My understanding is a 2-way switch is 2 switches that control the one light. Do I need a…
Coomie
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Can you dim already dimmed LED lights

Ive installed LED downlights in my room, these : https://www.screwfix.com/p/lap-fixed-led-downlight-contractor-pack-white-370lm-5w-220-240v-10-pack/728fj they are controller via a smart dimmer switch, this…
Ashley
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How to create a smart 3-way positional switch?

Looking at this switch as an example: https://www.directindustry.com/prod/tacthill-kynoppe/product-192123-1963276.html I have a similar 3-position switch in my garage that controls a water pump. Central position = off, down = permanently on, up =…
Dave Goodchild
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Home automation: why is wireless more popular than data over power line?

This is a question for discussion... I have recently started looking in to home automation and "smart devices" and see a clear tendency for everything to run on WiFi, with some exceptions of bluetooth, Zigbee and Z-wave. But why data transfer via…
elektrinis
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How to fully shut off an LED indicator when used with a Smart Switch?

Update See added comments at end of question. I am working on a project to implement a remotely lit indicator when triggered through a wireless connection. To make this work I am trying to use existing components as much as possible to eliminate…
Michael Karas
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