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From: email@example.com (Al Borowski)
Subject: Re: Can anyone help me to build addtional features to the two switches to control a toy?
Date: 30 Nov 2002 20:17:48 -0800
References: <firstname.lastname@example.org> <3DE8DCDD.8F75CC13@my.dacha>
NNTP-Posting-Date: 1 Dec 2002 04:17:49 GMT
Alex wrote in message news:<3DE8DCDD.8F75CC13@my.dacha>...
> Ti wrote:
> > Hello,
> > I need to design a Module for a Y-cable so that two switches must be
> > pressed to activate one toy (to teach cooperative play with 2
> > students) with jacks on all ends so that a variety of switches and
> > adapted toys can be used.
> > With help, in general this is what I have to do in order to activate
> > a toy by pressing two swiches.
> > for each one toy:
> > battery + and -, call them Batt+ and batt-
> > toy+ and toy-
> > switch1 contacts, sw1a and sw1b
> > switch2 contacts, sw2a and sw2b.
> > Now, connect batt- to toy-.
> > Connect batt+ to sw1a.
> > Connect sw1b to sw2a
> > connect sw2b to toy+
> > Thats it! Only when both switches are on will the toy get power.
> > In addition, more features are required to add to the design, JUST
> > RIGHT AFTER THE FIRST SWITCH IS PRESSED:
> > I need to build an indicator such as light or LED to signal that the
> > first switch is already pressed.
> > And the same time when indicator led turns on, a recorded voice plays
> > (such as music or command voice, it said "the first switch is already
> > pressed, press the second switch now, counting down 3, 2, 1). In
> > this case if the person press the second switch during the recorded
> > voice plays, the recorded voice has to be terminated right away.
> > Do I have to use an addtional power source to power an indicator and
> > the recorded command voice? How do I connect it? What kind of chips
> > should I use? Can anyone help me with information so I can build this
> > particular design?
> > Thanks alot.
> As an alternative to Al B's EPROM option, which requires an EPROM
> programmer (a device rapidly going out of common use), you could simply
> use a small micro with an A/D and a serial flash. At 8000 samples a
> second a 256kbit flash chip gives you 4 seconds of speech, a 1Mbit
> serial flash gives you 16 seconds. 2 input wires for the switches, a
> microphone through an LM358 or LM386 for input. Output through a PWM
> signla to an LM386. OR alternatively - get one of the early ISD
> sssspeech recorder chips, on a pre-built board, these are easily found.
> Wire the trigger for the board to the 'first switch pressed' detector,
> wire the reset to the 'second switch pressed' detector
> This project would be easiest to implement on a small micro. It could be
> done in logic if you can't find any friendly engineers or hobbyists
> nearby with a spare PIC.
Ah, but then you need a PIC programmer and knowledge of how to use it
OK, here's some more information: You need a data file containing your
speech. It should be 8 bits, at a low sampling rate (low as you can
tolerate). Some form of wave file?
Program this into your eprom.
Make some form of square wave osclittor. This can be done with a
single op amp (search the net for details). You also need some 8 bit
Hook the oscilattor up so it starts when switch 1 is closed. Put the
output into the counters. Put the counters into the address lines of
the EPROM. Buy a DAC chip, and hook it up to the data lines of the
Take this post and find someone in your area who knows about
electronics. This isn't a trivial thing for a beginner, so you'll need
help. God knows that I can't give you the level of help you will need
over usenet. Sorry I couln't help more, but there really is alot you
need to learn (no offence!)
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