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
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...
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?