RE: [Embedlets-dev] RE: Global Light Blinker -> can I propose the project?

[James C. <ca...@vi...>]

>I wonder if we could daisychain these units using your serial multidrop
idea?

Yes, I am certain we can.. 

What we could do is have an 8-bit DIP on one port of the uVM device and
read this in as the low byte of the IP address and have a fixed high
byte then the we can have each one have a number of relays probably up
to 16 or something.. So it would be easy to have 256 x 16 relays
controlled via http JXTA proxies sitting off a single PC serial port. We
could have a very simple board with a serial in/serial out port and
space for a bunch of relays per board. We could easily have different
sized boards for different numbers of relays per board.

I especially like that it illustrates the use of the http proxy for the
JXTA project and I think this is something that will really interest
them also because it is not a 'proprietry' solution but a generic
internet one. (HENCE) equally the boards can be all be address using the
JAPL remoting stack, or as .NET proxies from a .NET application or
directly from WinSOCK or basically any other way that put standard
TCP/IP down that RS232 socket! SO there is good re-use outside of the
JXTA proxy.. And this is also another reason not to use and depend on
the 1-wire APIS' etc

As for being ready.. Well I agree we nearly are. It would be nice to
have this all working before we submit. 

PS. The document is coming together beautifully thank-you for your input

James Caska
www.muvium.com
uVM - 'Java Bred for Embedded'



-----Original Message-----
From: emb...@li...
[mailto:emb...@li...] On Behalf Of
Ted Kosan
Sent: Sunday, 6 July 2003 9:11 AM
To: emb...@li...
Subject: RE: [Embedlets-dev] RE: Global Light Blinker -> can I propose
the project?


Topic tags:[ARCH][JAPL][WIRING][DOCS][MGMT][STRATEGY][NEWBIE]
_______________________________________________

James wrote:

> Well my thoughts are :
> 
> * Make sure we are ready first

What is your definition of ready?  To me ready means being able to
control something that is inside of a NAT domain from out on the
internet (the first thing that I am going to 'control' will just be a
simulated light on the screen).  As soon as this is proven to work the
rest is just plain embedded control stuff.



> * As an additional type of relay I would like to write a uVM 
> controller with a jxta http proxy :-) - then we can use the regular 
> serial connector and won't need special 1-wire translator and special 
> dallas iButtons at the relay end.. Also would be cheaper to throw a 
> uVM-877A a few relays and a regular serial cable into any 'DIY' kit..

James, this is a great idea!  The hardware configuration that I was
originally considering was looking fairly expensive but a pure
serial/uVM solution appears like it could be quite cheap.  I wonder if
we could daisychain these units using your serial multidrop idea?

Anyway, the JXTA project submission guidelines indicate that project
proposals need to be discussed first and in the initial proposal that I
would put together I would just say that the Embedlet Group would allow
the JXTA nodes to control simple home appliances like house lamps.  I
will not commit to any specific way of how this will be done and I will
refer to the hardware in strictly abstract black-box terms.


Ted 

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