Subject:
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Re: nxt + i2c sp03 Text-To-Speech?
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Tue, 5 Dec 2006 16:15:20 GMT
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Viewed:
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13296 times
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In lugnet.robotics.nxt, Tony Buser wrote:
> I'm a software guy, not a hardware guy. I have very little experience
> designing circuits. To show how little I know, I'm actually reading
> through Electronics Projects for Dummies at the moment. ;) Well in
> this book they describe a simple text-to-speech project and I thought
> it would be cool to create a tts module for the nxt. So I've been
> doing some research and found this i2c text-to-speech synthesizer,
> sp03: http://www.acroname.com/robotics/parts/R184-SP03.html and this
> great page on interfacing with the nxt i2c:
> http://www.cs.tau.ac.il/~stoledo/lego/i2c-8574/
>
> However after reading through the docs, it appears the nxt only
> provides 4.3v, but the sp03 requires 4.5 - 5.5v. For people who know
> better, would this mean I wouldn't be able to power it using the power
> from the sensor port directly? Would that 0.2v make a difference or
> could I use the other wire that supplies 9v for rcx-type analog
> sensors to power it?
I'd say its worth a try from the 4.3v supply from the NXT. I note that the SP03
spec. says it has a 3v regulator onboard, so its not really running from 5v
anyhow. The I2C signals are open drain, so they should be ok unless their inputs
won't work correctly from the 3.3v levels available from the NXT ouptuts.
Remember you'll need pullup resistors. I'd suggest something in the 47k - 82k
area. Of course that would be to a 3.3v rail. If you chose 56k, then pull down
resistors of 220k would limit the swing to about 3.4v. It may not be necessary
to use pull down resistors as the NXT has built in over-voltage clamp diodes I
believe.
JB
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Message is in Reply To:
 | | nxt + i2c sp03 Text-To-Speech?
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| I'm a software guy, not a hardware guy. I have very little experience designing circuits. To show how little I know, I'm actually reading through Electronics Projects for Dummies at the moment. ;) Well in this book they describe a simple (...) (17 years ago, 5-Dec-06, to lugnet.robotics.nxt)
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