Why does the RCSwitch.available return false?

Question

I am trying to use this example code from the RCSwitch library:

/*
 Simple example for receiving
 https://github.com/sui77/rc-switch
*/
#include <RCSwitch.h>
RCSwitch mySwitch = RCSwitch();
void setup() {
 Serial.begin(9600);
 mySwitch.enableReceive(0); // Receiver on inerrupt 0 => that is pin #2
}
void loop() {
 if (mySwitch.available()) {
 Serial.print("Is avail");
 int value = mySwitch.getReceivedValue();
 if (value == 0) {
 Serial.print("Unknown encoding");
 } else {
 Serial.print("Received ");
 Serial.print( mySwitch.getReceivedValue() );
 Serial.print(" / ");
 Serial.print( mySwitch.getReceivedBitlength() );
 Serial.print("bit ");
 Serial.print("Protocol: ");
 Serial.println( mySwitch.getReceivedProtocol() );
 }
 mySwitch.resetAvailable();
 }
}

It seems like the mySwitch.available() is returning false, but since there seems to be no documentation for the library I don't know what it means.

So why is that?

I am trying to use this code on a A-Star 32U4 Micro, which supports Arduino code.

Answer 1

I think that the value of available just determine if there is a message to receive or not.

• Peter Bloomfield: Yes, looking at the source code of the library, it seems that available() returns false if no data has been received yet.

Answer 2

Your code is OK. It seems that the transmitter's remote control frequency is different from the receiver. Both transmitters and receivers must have the same frequency. 433MHZ - TX with 433MHZ - RX 315MHZ - TX with 315MHZ - RX

• user1722245: HI,I checked,The wall switch is labeled with "433.92Mhz", reciever is ebay.co.uk/itm/…. It make me crazy :-( I have to miss smt