P
Phil
Hey all,
I was asked this week if I could come up with something simple to
trigger an alarm light in a noisy industrial environment. The direct
distance is only around 80 metres, but it's around a corner (approx 60
+ 60 metres walking) and there are quite a lot of large 3-phase motors
and inverters etc. in between.
Just FYI, I have a pair of Jaycar 433Mhz modules and a pair of Oatley
modules, also a pair of these
http://www.sparkfun.com/commerce/product_info.php?products_id=151
These modules are for my own use (if we ever get a rainy day again ,
and given that I don't want to spend my own (unpaid) time and
components, making circuits, writing code and testing comms, thought I
might ask you guys if there are any cheap alternatives around.
I've done some simple stuff with AVRs (using GCC as a compiler), but
again don't have the time to implement comms with error correction -
ie. manchester encoding, so instead thought something like an ATtiny13
interfaced to a radio modem may be the way to go, something like
this...
http://www.sparkfun.com/commerce/product_info.php?products_id=560
I notice that this has - from a blurry magnification, an
ATMEGA-something chip onboard (probably for comms only).
One problem I've found - after Googling for quite a while now, is that
although they have radio modems, resellers (especially in Australia)
appear to be a bit embarrassed with the prices of these units, and thus
don't show them. I could request quotes, but really, I just want to see
prices and buy the effer!
Other good places like Dontronics and Futurlec don't seem to carry
anything appropriate.
The other way I could go is to try starting out with Zigbees so that I
have a basis for future data aquisition, but not a cheap way to go I
think.
Anyway, enough of my rambling. Any thoughts people?
Cheers, Phil.
I was asked this week if I could come up with something simple to
trigger an alarm light in a noisy industrial environment. The direct
distance is only around 80 metres, but it's around a corner (approx 60
+ 60 metres walking) and there are quite a lot of large 3-phase motors
and inverters etc. in between.
Just FYI, I have a pair of Jaycar 433Mhz modules and a pair of Oatley
modules, also a pair of these
http://www.sparkfun.com/commerce/product_info.php?products_id=151
These modules are for my own use (if we ever get a rainy day again ,
and given that I don't want to spend my own (unpaid) time and
components, making circuits, writing code and testing comms, thought I
might ask you guys if there are any cheap alternatives around.
I've done some simple stuff with AVRs (using GCC as a compiler), but
again don't have the time to implement comms with error correction -
ie. manchester encoding, so instead thought something like an ATtiny13
interfaced to a radio modem may be the way to go, something like
this...
http://www.sparkfun.com/commerce/product_info.php?products_id=560
I notice that this has - from a blurry magnification, an
ATMEGA-something chip onboard (probably for comms only).
One problem I've found - after Googling for quite a while now, is that
although they have radio modems, resellers (especially in Australia)
appear to be a bit embarrassed with the prices of these units, and thus
don't show them. I could request quotes, but really, I just want to see
prices and buy the effer!
Other good places like Dontronics and Futurlec don't seem to carry
anything appropriate.
The other way I could go is to try starting out with Zigbees so that I
have a basis for future data aquisition, but not a cheap way to go I
think.
Anyway, enough of my rambling. Any thoughts people?
Cheers, Phil.