you using a transmitter in each sensor [isn't it], so you simply
[not realy simple!] can solve it with IP system [like internet IP but not exactly same], you sould choose a unique number for each of your sensors & send this number befor your data packet on a string[like data packets on internet].
also your MCU's on sensors shoud can wakeup after sleep period by thire own,[don't worry about sleep period ,it's no matter at all,choose what you want!]
and after all these! we wants to communicate!!!!!!!!!
===>> first I want to explane it for just one sensor,so
[your main receiver[I will call it MR,ok] will always be ON & your sensors will wake up by thire timeout period],so go on
imagean:
timeout is finish and your sensor going on and send data packet[and will stay ON up to(stay here and go to MR part)
MR will take the packet and read that unique number and get the data on the packet (PAUSE! there is two posibelites
1.you reseive your data correctly, so your MR will send a packet(with that
unique number and a small command to turn of that sensor) to[actually all of
your sensors], but most of them are off and couldn't get that packet[advantage!]
and mabe some of your sensors are on and recieve that packet BUT the only sensor that going of is the sensor who send the data and have thet unique number.
2.you reseive your data wrong with that unique number you can call your sensor
to send the data again by a command[as I explained it above for turnning off command]. you get your data correctly so do (1.)
It will work impressively [if you can make it right!!!!(don't worry it seems more complicated than it is!)]
I tryed it befor for an one by one IR system [that was more complicated],and that
worked realy impressive.
we done one by one communication so what about one to many?
it will work fine for one to many too [if not how the internet work???!!!!].
you just need to put a repeat loop on your sensor part, for the times your MR
couldn't get the packet from your sensors [for any reasons]
again imagean:
your sensor sent it's data and wait for a while to receive OFF command from MR
but there is no answer [it means your MR couldn't get your sensor data, because
if your MR get the data it should answer] ,so it sould send data again and waite again[up to a successful Communication] also it will happening if your sensor
couldn't get the of command.
getting ABIT!!!!!!! long .... isn't it !!!
I'm realy slow in typing,I could made this circuit on the time I spend for
typing this!!!!!!!!!! (just as fun...., don't mention it ! )
hope helped
mosh
