Powering 2 12V Electromagnets

I am still trying to understand ohms law, which looked simple at first, and it probably is simple, but when i look at charts that have the laws for resistance voltage wattage and current, I get confused, because often times you are given 2 variables, how do you get all four? My main question is what voltage would I need to power 2 12v electromagnet, would i need a 12v psu or 24v, or something in between?

Thanks

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michaelkellett over 9 years ago in reply to gub11 +2

You should never have an automatic lock on your bedroom door (especially if under 90 years old) for the following reasons: 1) It puts off visitors 2) In case of fire you will not be rescued 3) Everyone…
gadget.iom over 9 years ago in reply to jack.chaney56 +1

Jack Chaney wrote: 12v supply for your power, and link the magnets in parallel. I would agree
jack.chaney56 over 9 years ago in reply to michaelkellett +1

Gabriel's question and the solutions that I have seen are typical of a great discussion, because the search for the solution is uncovering more requirements. This is not just good engineering, but great…

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0 supper_slash over 9 years ago

Ok, first, here is an idea if you just wish for something ready-made for this.
http://goo.gl/BUOHls

Here is an Arduino option also. Unlock Your Front Door Without Keys Using This DIY Keyfob Entry System « Hacks, Mods & Circuitry
To answer your question for the solenoid, it is a push solenoid, that is when you energized it is designed to extend out.
Then when you power it down, it will retract. I myself would not like it to be set up so you would need it to have its primary position as "out".
In other words, I would not have it powered 90% of the time than powered down for a minute, then powered up.
Personally, I would have it set up mechanically so it would be off most of the time, then when I need to access "the door" it will power on, let me in, then back off again.

On a larger scale, what are you using to drive this set up as far as a Microcontroller, or, and Arduino board, or do you have something already in place in mind?

In my thinking, If I wanted to automate a front door, with a latch, and build everything myself. This is what I would do.

Here is whatI would do.

https://sway.com/EM98djLYBMpg0167
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0 gub11 over 9 years ago in reply to supper_slash

the lock is for my bedroom door, it is mostly for when people knock, instead of getting up and opening it, i can just unlock it from my desk, I will use some sort of microcontroller, probably the arduino pro mini, then send a signal via an rf transmitter and receiver to a mosfet to let power go through, though I am very new to mosfets, transistors, etc. so i am not sure what the best way to switch on and of the power would be
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0 michaelkellett over 9 years ago in reply to gub11

You should never have an automatic lock on your bedroom door (especially if under 90 years old) for the following reasons:

1) It puts off visitors
2) In case of fire you will not be rescued
3) Everyone will think you are up to something they should snoop on

MK
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0 gub11 over 9 years ago in reply to michaelkellett

I totally agree. Im not doing it cuz I'm a teenager who wants to keep his parents out of his room, but I am a teenager.
I'm doing it because
1) I've never worked with magnets, so it seems like a good way to learn
2) when I'm playing a video game or I'm talking to a friend, it's annoying when people enter without knocking, so it will only be locked when I'm sitting at my desk, obviously unlocked when I go to bed.
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0 gub11 over 9 years ago in reply to michaelkellett

I totally agree. Im not doing it cuz I'm a teenager who wants to keep his parents out of his room, but I am a teenager.
I'm doing it because
1) I've never worked with magnets, so it seems like a good way to learn
2) when I'm playing a video game or I'm talking to a friend, it's annoying when people enter without knocking, so it will only be locked when I'm sitting at my desk, obviously unlocked when I go to bed.
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