powering my B.O.E. from a PC
i have been looking into adding a RFID security feature in my PC for a few reasons, it will sell quicker and i have sisters and a girlfriend who decide that my computer can be shutoff when they feel like it regardless of what i have left up running including school work and my BS2 Projects. Now the homework i can spare but i just cant have it for the BS2 haha! i that thinking about implementing my B.O.E or my Homework board(probably my homeworkboard) into my PC with an rfid reader and a relay or some sort of switch to disable the power button and restart button from being pushed when its armed.
The Problem:
I Figured ide make it easy for those not wanting to hear the story and make this little skip-section, seeing that if i sell this PC i do not wish for them to have a problem with dead batteries and i wanted to know if its possible to run off the PC power supply. I have come to a major problem being i dont want to fry the microcontroller and that when the pc shuts off so does the juice to the supply. How can i hookup to the power Supply But run off the battery when needed also?
The Problem:
I Figured ide make it easy for those not wanting to hear the story and make this little skip-section, seeing that if i sell this PC i do not wish for them to have a problem with dead batteries and i wanted to know if its possible to run off the PC power supply. I have come to a major problem being i dont want to fry the microcontroller and that when the pc shuts off so does the juice to the supply. How can i hookup to the power Supply But run off the battery when needed also?
Comments
You can built a PWM based on 555 and enable it by stamp... But stamp must also check the outputs of the ATX so forget it........ You will probably destroy your PC...
The only thing you can do is to replace the power botton with a relay (I don't know for other motherboards but mine's just a push botton connected to it) For best results you must have a battery pack that recharges through the PC supply... Or else you can use a wallpack for powering up the stamp... And the PC power supply needs·to filter, stabilized by a diode bridge(some time it may switches, I don't know that just heared it somewhere) and regulated... Think you can make it... It's ok but you better change chassis...
And one more thing... the power of the computer isn't turned down by software???????
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-Rule your Destiny-
--Be Good. Be Bad. Be Provas--
If the PC has a power switch on the back that actually disconnects the power from the power supply (usually it's a red or black rocker switch that's built-in to the power cable connector assembly or is next to it), you may not be able to easily replace this. Best is to make a cover that's screwed on, usually out of a piece of plastic, that prevents busy fingers from flipping the switch easily. You have to be very careful how you fasten the cover so that the screws don't contact any wires or connectors inside the case. Sometimes there are existing screw holes that you can use by substituting a longer screw (again being careful about how far into the case the screws project).
Post Edited (Mike Green) : 8/13/2006 5:12:28 PM GMT
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- Stephen
I've never bought a used PC, I've always lobotomized and upgraded what I have or bought something brand new. I'm just curious if ( In today’s "disposable" society ) the amount of energy
and effort you are putting into your "tower" is worth the re-sale value. What I'm trying to say is that you might be better off trying to upgrade what you already have and learn something along
the way or save up for something new in the future. (<-- Suppose the same analogy could be applied to the girlfriend)
As far as keeping this "ON-topic", the RFID reader idea is ok, but again... I'm not sure this will impact your resale value to energy/effort ratio the way you expect it is going to.
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
Post Edited (Beau Schwabe (Parallax)) : 8/13/2006 8:01:36 PM GMT
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Chris Savage
Parallax Tech Support
csavage@parallax.com
Ron
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- Stephen