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Author Topic: not really about robots. (voice recorder)  (Read 3781 times)

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Offline cooldogTopic starter

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not really about robots. (voice recorder)
« on: January 22, 2008, 11:14:46 AM »
okay,

so it is my happy job from my teacher to make a carbord sigh that when i pass it it says "hello"

i will need a motion sensor and voice recorder

question: how can i hook it up so that when it senses motion it plays my recording.

the tricky part is that i want it to be able to rewind it's self so that i can just leave it there and it will say hello to anyone that it there without having to rewind every time

also i have no programing experiance and cant learn by friday so no code pls
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Offline airman00

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Re: not really about robots. (voice recorder)
« Reply #1 on: January 22, 2008, 11:28:31 AM »
Ok simple


get one of those cheap digital voice recorders, that you press a button and it plays a message ,i think its called a spy recorder or something

get a motion sensor that turns on a LED , or just use comparators connected to the motion sensor and have it switch a transistor which switches the voice recorder . Also, the voice recorder speaker is pretty weak, so I would make an audio amplifier circuit and play it on some big speakers.

Also, look around google, there are many projects like this
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Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #2 on: January 22, 2008, 11:37:10 AM »
Ok simple


get one of those cheap digital voice recorders, that you press a button and it plays a message ,i think its called a spy recorder or something

get a motion sensor that turns on a LED , or just use comparators connected to the motion sensor and have it switch a transistor which switches the voice recorder . Also, the voice recorder speaker is pretty weak, so I would make an audio amplifier circuit and play it on some big speakers.

Also, look around google, there are many projects like this

okay couple of things

what are
comparators
transistors


also how will i get it to rewind or when it stops pressing play will it automatically go back to the beginning

also if there are many people will it just keep playing without rewinding
« Last Edit: January 22, 2008, 11:37:59 AM by cooldog »
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Offline Trumpkin

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Re: not really about robots. (voice recorder)
« Reply #3 on: January 22, 2008, 11:45:43 AM »
I think comapators are chips that don't need any programming, it's like a microcontroller but is just an electronic circuit. Here is an example http://www.robotroom.com/Comparator.html. I hope this helped and good luck!
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Offline airman00

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Re: not really about robots. (voice recorder)
« Reply #4 on: January 22, 2008, 11:52:33 AM »
since it is a digital recorder ( there are no tapes and stuff)  you press a button, plays a sound, and resets
like this toy http://www.amazon.com/Wild-Planet-Spy-Gear%C2%AE-Pen-X2/dp/B0007V62YK

though there are cheaper ones

search google for how comparators work and what transistors are .

now the problem of multiple people passing by. That would keep on triggering the thing so it wouldn't even play the thing once,  imagine pressing the play button very quickly , it doesnt play the message , unti lyou let go and give it like a second. So to get around this I would use a capacitor and an inverter to keep the transistor open for a second after you send a signal to play the sound .

Google around ,and if you have more specific questions related to anything i said, post the question. But seriously google , the forum, and admin's tutorials have info on all of this .

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Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #5 on: January 22, 2008, 11:56:41 AM »
idea

could i just run leads from the LED that it turns on ton the play button.

then so that if it just keeps playing, for the length of the recording i record the same message over and over
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Offline airman00

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Re: not really about robots. (voice recorder)
« Reply #6 on: January 22, 2008, 12:00:45 PM »
idea

could i just run leads from the LED that it turns on ton the play button.

then so that if it just keeps playing, for the length of the recording i record the same message over and over

not understanding what you are saying
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Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #7 on: January 22, 2008, 03:01:12 PM »
okay so if i get a moitin detector that turns on a led

i take out the led and run the wires from were the led was connected to the play button


then instead of the chip i just record the message many times. so if the recorder stays on i will say "hello hello hello..." untill the message runs out
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Offline airman00

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Re: not really about robots. (voice recorder)
« Reply #8 on: January 22, 2008, 03:09:10 PM »
run wires from the LED to the a transistor or relay which will switch the play button .

remember to ground the negative connection of both circuits.

you record hello many times and then press play ,yes that is fine
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Offline ed1380

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Re: not really about robots. (voice recorder)
« Reply #9 on: January 22, 2008, 05:18:52 PM »
my bro got a spongebob from a happy meal or w/e.
you press the button and it lets you record like 5 seconds. press another button and it'll play it back

like it's been said, hack one of those up
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Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #10 on: January 22, 2008, 07:34:41 PM »
cool

okay so i have this spy camera decoy thingy

it's motion sensitive and i was wondering the motion sensor id this little tube that has two wire sticking out if it that connect to the circut board. when activated it turns left and right, and turn on a LED. so can i just take the motion sensor without the circut board or will the circut board be needed for it to work
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Offline paulstreats

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Re: not really about robots. (voice recorder)
« Reply #11 on: January 22, 2008, 07:39:50 PM »
probably the motion sensor needs the circuit board to interpret the sensors output

Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #12 on: January 22, 2008, 07:44:04 PM »
okay so i'll take the whole thing and take out the LED then hook it to the voice recorder

also
Also, the voice recorder speaker is pretty weak, so I would make an audio amplifier circuit and play it on some big speakers.

how do i make a audio amplifier circut

already checked google
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Offline ed1380

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Re: not really about robots. (voice recorder)
« Reply #13 on: January 22, 2008, 07:51:21 PM »
check the forum. there was a thread today about it. electronic section maybe
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Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #14 on: January 22, 2008, 08:02:34 PM »
is there a way to make it so that the speaker has a seperate power sorce

so the sound comes from the recorder but the speaker power comes from a battery
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Offline ed1380

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Re: not really about robots. (voice recorder)
« Reply #15 on: January 22, 2008, 08:15:10 PM »
yeah. isnt that what an amp does?
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Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #16 on: January 22, 2008, 08:19:40 PM »
well someone should have told me :P

okay but if i have that working will the sighnal be strong enough for the big speaker
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Offline Trumpkin

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Re: not really about robots. (voice recorder)
« Reply #17 on: January 22, 2008, 08:28:07 PM »
I think it should be I'm not sure though
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Offline airman00

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Re: not really about robots. (voice recorder)
« Reply #18 on: January 22, 2008, 08:38:22 PM »
its time to calculate!  ;D


first decide on a speaker and then we'll help you out with the audio amp
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Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #19 on: January 23, 2008, 03:21:02 PM »
okay guys i took the recorder apart and founs it used 3 watch batterys that are wired in paralel (4.5V)

i have this old walky talky that i took apart, it runs from a 9v battery.

the speaker has places to attach 4 leads 2 are audio and the others are not connected to anything (maybe external power)
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Offline ed1380

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Re: not really about robots. (voice recorder)
« Reply #20 on: January 23, 2008, 03:47:53 PM »
speaker from walkie talky right?

unless the speaker has a built in amp(most likely not) the 4 connections might be interconnected so making it 2
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Offline cooldogTopic starter

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Re: not really about robots. (voice recorder)
« Reply #21 on: January 23, 2008, 04:34:40 PM »
okay scratch that

i poked around a little and found a old speaker that i pulled from a toy car

it has only two wires

(didn't want to over compicate the speaker seeing as i only have 2 days left to complete it)

it has some writing on the back "X R 8 0.5w" in bettween the 8 and 0 there is a little funny hourse shoe thingy
« Last Edit: January 23, 2008, 04:55:04 PM by cooldog »
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Offline ed1380

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Re: not really about robots. (voice recorder)
« Reply #22 on: January 23, 2008, 05:42:32 PM »
IIRC that's impedence.
for your application i dont think it'll mater.
it's mostly used for/by profesionals
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Offline Trumpkin

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Re: not really about robots. (voice recorder)
« Reply #23 on: January 23, 2008, 09:03:30 PM »
the "weird horse shoe thing" is probably the symbol for ohms
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