Help with a binary stream...

C

chicksDigUNIX

Jan 1, 1970
0
I'm a newbie at this, so I was hoping someone could help...

I'm working on a device that, when pressed against my locker at school
(and when I tell the device to do so), will send a stream of digits
(binary) through my conductive locker metal, to be interpreted on the
other side by a device which will check the numbers to be correct (so
as to prevent unwanted intruders), and then pop the locker open using
a hydraulic and paperclip...

My only question is, how does one create a logic circuit to handle a
stream of data?

Any help is greatly appreciated

B

Brain E. Ack

Jan 1, 1970
0
I'm a newbie at this, so I was hoping someone could help...

I'm working on a device that, when pressed against my locker at school
(and when I tell the device to do so), will send a stream of digits
(binary) through my conductive locker metal, to be interpreted on the
other side by a device which will check the numbers to be correct (so
as to prevent unwanted intruders), and then pop the locker open using
a hydraulic and paperclip...

My only question is, how does one create a logic circuit to handle a
stream of data?

Any help is greatly appreciated
i have another idea for trasnmitting the information. instead of using a
readio signal, you could have device with a simple elcrtromagnet coil. on
the other side of the locker door, in a special spot, would be a mafgnetic
reed switch. you could send the binary code by turning the electromagnet
on and off which would activate the reed switch and send the code to the
controler circuit. this would probably be easier to implement than using
an rf transmitter.

C

chicksDigUNIX

Jan 1, 1970
0
Brain E. Ack said:
i have another idea for trasnmitting the information. instead of using a
readio signal, you could have device with a simple elcrtromagnet coil. on
the other side of the locker door, in a special spot, would be a mafgnetic
reed switch. you could send the binary code by turning the electromagnet
on and off which would activate the reed switch and send the code to the
controler circuit. this would probably be easier to implement than using
an rf transmitter.

This is much like my initial idea...

But will the electromagnet make it through my pseudo-conductive
painted locker metal, as Dana suggested?

And how do I interpret the stream of data coming in? All that I need
to interpret is a stream of 21 states of on or off...

Maybe some sort of timer?

If you need any more details as to my plan, I can post all of my ideas
here... But not now, cause I'm tired...

Thanks!

N

no_one

Jan 1, 1970
0
It would seem that the conductive locker would act like a faraday cage and
shield the "signal" from reaching the interior of the locker. I would see
if a garage door opener would get through the usual slits that are cut in
most locker doors and use a garage door opener receiver to actuate whatever
device will be inside the locker (not a lot of room for books, mind you!)

B

Brain E. Ack

Jan 1, 1970
0
This is much like my initial idea...

But will the electromagnet make it through my pseudo-conductive
painted locker metal, as Dana suggested?

And how do I interpret the stream of data coming in? All that I need
to interpret is a stream of 21 states of on or off...

Maybe some sort of timer?

If you need any more details as to my plan, I can post all of my ideas
here... But not now, cause I'm tired...

Thanks!
yes. the lectricle conducitvy would have practically no effect on weather
the magnetic field will pass through it. what would effect it is if the
locker was made out of a matgnetic metal like steel, which most are.
Still, the megnetic field should be detected by the reed switch on the
other side. Instead of using a reed switch, you could use a hall sensor which would be more
sensitive the weak magnetic field.

B

Brain E. Ack

Jan 1, 1970
0
This is much like my initial idea...

But will the electromagnet make it through my pseudo-conductive
painted locker metal, as Dana suggested?

And how do I interpret the stream of data coming in? All that I need
to interpret is a stream of 21 states of on or off...

Maybe some sort of timer?

If you need any more details as to my plan, I can post all of my ideas
here... But not now, cause I'm tired...

Thanks!

you could also transmit the code with sound. you could have a speaker in
the transmitte that you pres up against the locker whrer there is a
microphone on the other side. you could send 0 as one tone and 1 as
another tone. that way, you avoid having to use a timer or clock to
sycronise the pulses since there would actual be thres states" no sound,
tone1 and tone 2, then, all you need would be to detect whic tone is
which.

C

chicksDigUNIX

Jan 1, 1970
0
Brain E. Ack said:
yes. the lectricle conducitvy would have practically no effect on weather
the magnetic field will pass through it. what would effect it is if the
locker was made out of a matgnetic metal like steel, which most are.
Still, the megnetic field should be detected by the reed switch on the
other side. Instead of using a reed switch, you could use a hall sensor which would be more
sensitive the weak magnetic field.

I'm unfamiliar with the terminology... what is a reed switch? A hall
sensor?

It sounds like the electromagnet would be an economical and efficient
way to do it, assuming that I can figure out how to decrypt the
binary... any ideas anyone?

B

Brain E. Ack

Jan 1, 1970
0
I'm unfamiliar with the terminology... what is a reed switch? A hall
sensor?

It sounds like the electromagnet would be an economical and efficient
way to do it, assuming that I can figure out how to decrypt the
binary... any ideas anyone?
a reed switch is a switch usually enclosed in glass that has a flexible
peice of metal, when a magnet is placed near it, it bends the metal which
then makes contact with anoother pice of metal. a hall sensor is a specil
device that can detect magnetic fields.

T
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