Sure, anyone can receive.
Use VirtualWire library, send the receiver address as part of your message, each receiver sees the message and decides if its for them.
Can send a single byte: upper 3 bits are the address 000-111, next 3 bits are what the receiver is to control (1 of 8 devices), last two bits are on/off status.
VirtualWire adds some bytes to make sure receiver is in sync, and to manchester encode the message for integrity.
transmit side (there is some basic stuff to put in void setup too):
msg[0]=data_to_send; // load the array with the byte of data to send,
vw_send((uint8_t *)msg, strlen(msg)); // send the character out
vw_wait_tx(); // Wait until the whole message is gone
receive side:
// look for wireless input or for unsolicited message from transmitter
uint8_t buf[VW_MAX_MESSAGE_LEN]; // creates buf[0]
uint8_t buflen = VW_MAX_MESSAGE_LEN;
if (vw_get_message(buf, &buflen)) // Non-blocking
{
// break up the byte, see if for this receiver
receiver = buf[0] & B11100000;
if (receiver == Bxxx00000){ // see if upper 3 bits match our address, fill in xxx with 000 to 111
// its us, clear receiver for next time
receiver = B11100000; // B11100000 reserved for no one selected??
//now see which device to handle
device = (buf[0] & B00011100) >> 2; mask off the address & 'command', shift it right 2 bits
// and find the command to perform
command = (buf[0] & B00000011; // mask off the address & device
switch (device){
case 0:
// do command 0, 1,2,3
break;
case 1:
// do command 0, 1,2,3
break;
:
:
case 7:
// do command 0,1,2,3
break;
} // end switch case
} end if receiver
} end if get message
You’ll have read & understand the VirtualWire library, this will make a lot more sense then. It is very straightforward to use.
