transmitter/Recievers
Archiver
Posts: 46,084
I am designing a project that will use one transmitter connected to
a BS2 that will continusually spew data to all the recievers all
over the house for example. the recievers will have an lcd display
but do they also need a BS2 to put the data such as temp. to the
lcd? are there any cheap transmitters/recievers to do this that are
compact and could go 500+ feet?
thanks
mark
a BS2 that will continusually spew data to all the recievers all
over the house for example. the recievers will have an lcd display
but do they also need a BS2 to put the data such as temp. to the
lcd? are there any cheap transmitters/recievers to do this that are
compact and could go 500+ feet?
thanks
mark
Comments
recievers to convert the incoming stream to something that can be
displayed.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: uebermenchens [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=DJFjLWGbh7KNiUvFjcYUBwcaJZGhMQgII8GGTCL4JUqNkW-YAryuORfxROY79BptxZ0-_w1wgdhsb4RsdQ]uebermenchens@a...[/url
Sent: Thursday, July 08, 2004 8:37 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] transmitter/Recievers
I am designing a project that will use one transmitter connected to
a BS2 that will continusually spew data to all the recievers all
over the house for example. the recievers will have an lcd display
but do they also need a BS2 to put the data such as temp. to the
lcd? are there any cheap transmitters/recievers to do this that are
compact and could go 500+ feet?
thanks
mark
Linx Technologies, http://www.linxtechnologies.com/, makes some decent
inexpensive transmitters that are capable of sending raw serial data. I'm
not quite sure of their range, but I purchased a 433MHz set earlier in the
year for a similar project. I actually have RS232 data from a PC going to
the transmitter and then the receivers are directly connected to a
VFD. The only problems I've ran into are 1) You need to use a line-driver
(MAX232/233) set on both ends (rx and tx) and 2) when the unit is close to
range limits, or "staticy", the display can go haywire. Since the display
is "intelligent" and can accept commands to do other things, like blink the
cursor, reverse the field, etc, it can cause some really undesired
operations until the display is reset. Using a BS2 as a filter might not
be a bad idea. You can setup your stream with a header and a checksum,
and if the rx-side BS2 doesn't get the stream properly, it''ll throw it out
waiting for the next packet.
Just an idea.
Kris
>I think you're probably going to need some kind of intelligence in your
>recievers to convert the incoming stream to something that can be
>displayed.
>
>-- Jon Williams
>-- Applications Engineer, Parallax
>-- Dallas Office
>
>
>
Original Message
>From: uebermenchens [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=zX-T7Rc0nR8p21UMVYomkVwyXASWE5gE-cZB4XrvFIZQldUfdHBy0z-ECfYXEqINcES1uP1BoUQZ0OGhZ4o]uebermenchens@a...[/url
>Sent: Thursday, July 08, 2004 8:37 PM
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] transmitter/Recievers
>
>
>I am designing a project that will use one transmitter connected to
>a BS2 that will continusually spew data to all the recievers all
>over the house for example. the recievers will have an lcd display
>but do they also need a BS2 to put the data such as temp. to the
>lcd? are there any cheap transmitters/recievers to do this that are
>compact and could go 500+ feet?
>
>thanks
>mark
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>Yahoo! Groups Links
>
>
>
>
Range of these units, very much depending on antenna configurationm and
local interference, is about 300'. It also depends on how often you need to
send/receive data. Past about 50' error checking on the data becomes a must.
I'm not sure about the 232 converters. Why did you need those? I have used a
bunch of Linx units without.
Jonathan
www.madlabs.info
Original Message
From: "Kristoffer M. Hain" <haink@k...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, July 09, 2004 5:21 AM
Subject: RE: [noparse][[/noparse]basicstamps] transmitter/Recievers
> Mark -
>
> Linx Technologies, http://www.linxtechnologies.com/, makes some decent
> inexpensive transmitters that are capable of sending raw serial data.
I'm
> not quite sure of their range, but I purchased a 433MHz set earlier in the
> year for a similar project. I actually have RS232 data from a PC going
to
> the transmitter and then the receivers are directly connected to a
> VFD. The only problems I've ran into are 1) You need to use a
line-driver
> (MAX232/233) set on both ends (rx and tx) and 2) when the unit is close to
> range limits, or "staticy", the display can go haywire. Since the
display
> is "intelligent" and can accept commands to do other things, like blink
the
> cursor, reverse the field, etc, it can cause some really undesired
> operations until the display is reset. Using a BS2 as a filter might not
> be a bad idea. You can setup your stream with a header and a checksum,
> and if the rx-side BS2 doesn't get the stream properly, it''ll throw it
out
> waiting for the next packet.
>
> Just an idea.
> Kris
>
>
>
> >I think you're probably going to need some kind of intelligence in your
> >recievers to convert the incoming stream to something that can be
> >displayed.
> >
> >-- Jon Williams
> >-- Applications Engineer, Parallax
> >-- Dallas Office
> >
> >
> >
Original Message
> >From: uebermenchens [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=6Q8cobiZK5H-AlZ0X2delDaw7VaB70Kp-TDkNCguRCJoogorYw8dGD-p6f1S8geWvmnYXncRsVT6WQ6w6g]uebermenchens@a...[/url
> >Sent: Thursday, July 08, 2004 8:37 PM
> >To: basicstamps@yahoogroups.com
> >Subject: [noparse][[/noparse]basicstamps] transmitter/Recievers
> >
> >
> >I am designing a project that will use one transmitter connected to
> >a BS2 that will continusually spew data to all the recievers all
> >over the house for example. the recievers will have an lcd display
> >but do they also need a BS2 to put the data such as temp. to the
> >lcd? are there any cheap transmitters/recievers to do this that are
> >compact and could go 500+ feet?
> >
> >thanks
> >mark
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the Subject and
> >Body of the message will be ignored.
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
I needed the 232 converters because the RF modules I was using (RM series I
believe...the 433MHz modules in a SIP package) accepted data at TTL levels
only. My computer and VFD display did not accept TTL levels, they were the
standard (and sort of strange to me) RS232 levels. I had managed to get
the modules to work once or twice hooking them up directly, but the
transmitter was seriously being overdriven. I didn't want to damage the
unit, so I put the converters on. That also seemed to increase S/N a bit
(probably just because I wasn't peaking the input to death)
I also, with the best antennas and conditions, saw about 300' of max
range...and don't breathe on it, or you'll lose data [noparse]:)[/noparse] For what I'm
doing around the house, the longest it would ever need to go is about 100'
or so...and for the most part, does well.
If anyone has any better serial/RS232 wireless products at decent
prices...let me know, I'm still on a search myself.
Kris
>Kris, Mark,
>
>Range of these units, very much depending on antenna configurationm and
>local interference, is about 300'. It also depends on how often you need to
>send/receive data. Past about 50' error checking on the data becomes a must.
>
>I'm not sure about the 232 converters. Why did you need those? I have used a
>bunch of Linx units without.
>
>Jonathan
>
>www.madlabs.info
>
>
>
>
Original Message
>From: "Kristoffer M. Hain" <haink@k...>
>To: <basicstamps@yahoogroups.com>
>Sent: Friday, July 09, 2004 5:21 AM
>Subject: RE: [noparse][[/noparse]basicstamps] transmitter/Recievers
>
>
> > Mark -
> >
> > Linx Technologies, http://www.linxtechnologies.com/, makes some decent
> > inexpensive transmitters that are capable of sending raw serial data.
>I'm
> > not quite sure of their range, but I purchased a 433MHz set earlier in the
> > year for a similar project. I actually have RS232 data from a PC going
>to
> > the transmitter and then the receivers are directly connected to a
> > VFD. The only problems I've ran into are 1) You need to use a
>line-driver
> > (MAX232/233) set on both ends (rx and tx) and 2) when the unit is close to
> > range limits, or "staticy", the display can go haywire. Since the
>display
> > is "intelligent" and can accept commands to do other things, like blink
>the
> > cursor, reverse the field, etc, it can cause some really undesired
> > operations until the display is reset. Using a BS2 as a filter might not
> > be a bad idea. You can setup your stream with a header and a checksum,
> > and if the rx-side BS2 doesn't get the stream properly, it''ll throw it
>out
> > waiting for the next packet.
> >
> > Just an idea.
> > Kris
> >
> >
> >
> > >I think you're probably going to need some kind of intelligence in your
> > >recievers to convert the incoming stream to something that can be
> > >displayed.
> > >
> > >-- Jon Williams
> > >-- Applications Engineer, Parallax
> > >-- Dallas Office
> > >
> > >
> > >
Original Message
> > >From: uebermenchens [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ea8_62hehQnH_Cngd-O0S6FDof3j2lhfZIPp5YKESwEC4AHIAXeKGP6LE2QfxWsRzAyNcZwMdr9asOz8]uebermenchens@a...[/url
> > >Sent: Thursday, July 08, 2004 8:37 PM
> > >To: basicstamps@yahoogroups.com
> > >Subject: [noparse][[/noparse]basicstamps] transmitter/Recievers
> > >
> > >
> > >I am designing a project that will use one transmitter connected to
> > >a BS2 that will continusually spew data to all the recievers all
> > >over the house for example. the recievers will have an lcd display
> > >but do they also need a BS2 to put the data such as temp. to the
> > >lcd? are there any cheap transmitters/recievers to do this that are
> > >compact and could go 500+ feet?
> > >
> > >thanks
> > >mark
> > >
> > >
> > >To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > >from the same email address that you subscribed. Text in the Subject and
> > >Body of the message will be ignored.
> > >
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>Yahoo! Groups Links
>
>
>
>
>
> I needed the 232 converters because the RF modules I was using (RM series
I
> believe...the 433MHz modules in a SIP package) accepted data at TTL levels
> only. My computer and VFD display did not accept TTL levels, they were
the
> standard (and sort of strange to me) RS232 levels.
Aha.
>
> I also, with the best antennas and conditions, saw about 300' of max
> range...and don't breathe on it, or you'll lose data [noparse]:)[/noparse] For what I'm
> doing around the house, the longest it would ever need to go is about 100'
> or so...and for the most part, does well.
Hehe, sounds like you spent a while trying to push the range as far as you
could too ;-)
>
> If anyone has any better serial/RS232 wireless products at decent
> prices...let me know, I'm still on a search myself.
>
For the price and ease of use, these are good little units. Like you said,
limited to about 100' of range they do quite well. I have a two way
controller and sensor set up in my garden using these modules, and it works
great. Also, linx has a lot of quality application notes and so on too.
Jonathan
www.madlabs.info