What's the best Prop object to use for cheap 433MHz radio communications?
ElectricAye
Posts: 4,561
I'm interested in having two Propellers talk to each other via a simple radio link using cheap 433MHz radios, the kind of radio used for garage door openers, etc. Communication is only one-way, from one Prop to the other. They would need to transfer data at only about 600 baud or thereabouts, transfer maybe 7 or 8 bytes (or maybe even fewer than that). It doesn't need to be highly reliable, again something on the order of a garage door opener would be good enough.
To save on batteries, I need the ability to run the receiver Prop in a lower-power mode, have it wake up every so often, listen for a signal, do something if that signal is there, but otherwise go back to sleep and save power if nothing is there. I know that some serial input devices can sometimes get "hung" because their timeout features will reset when noise is present on the line, so I don't know if some sort of timeout feature would be needed on the software, or if the Propeller's parallel processing could override such a tendency for serial timeouts to hang.
Anybody know of the best object for doing this? There seem to be a lot of choices in the OBEX and I am ignorant and unworthy of the many pearls of wisdom that lay gleaming there.
To save on batteries, I need the ability to run the receiver Prop in a lower-power mode, have it wake up every so often, listen for a signal, do something if that signal is there, but otherwise go back to sleep and save power if nothing is there. I know that some serial input devices can sometimes get "hung" because their timeout features will reset when noise is present on the line, so I don't know if some sort of timeout feature would be needed on the software, or if the Propeller's parallel processing could override such a tendency for serial timeouts to hang.
Anybody know of the best object for doing this? There seem to be a lot of choices in the OBEX and I am ignorant and unworthy of the many pearls of wisdom that lay gleaming there.
Comments
Looks interesting, very capable, but maybe a little pricey??? At digikey I'm seeing prices around $13 for one chip. That contrasts to the cheapy RF units that are used in garage door openers that I had in mind, which go for $5 or so per matching pair. Is there a source you know that sells them cheaper?