I have been expiramenting with some RF links (tutorial here, RF link). The tutorial is great, but it only does serial communications.
The code I use is
// transmitter.pde
//
// Simple example of how to use VirtualWire to transmit messages
// Implements a simplex (one-way) transmitter with an TX-C1 module
//
// See VirtualWire.h for detailed API docs
// Author: Mike McCauley ([email protected])
// Copyright (C) 2008 Mike McCauley
// $Id: transmitter.pde,v 1.3 2009/03/30 00:07:24 mikem Exp $
#include <VirtualWire.h>
void setup()
{
Serial.begin(9600); // Debugging only
Serial.println("setup");
pinMode(13, OUTPUT);
pinMode(10, INPUT); // Initialise the IO and ISR
vw_set_ptt_inverted(true); // Required for DR3100
vw_setup(2000); // Bits per sec
}
void loop()
{
int buttonState = digitalRead(10);
const char *msg = "hello";
if (buttonState == HIGH){
digitalWrite(13, true); // Flash a light to show transmitting
vw_send((uint8_t *)msg, strlen(msg));
vw_wait_tx(); // Wait until the whole message is gone
digitalWrite(13, false);
delay(200);
}
}
My problem is that it seems to bypass my if() statement, and just transmitts anyway. Does anyone know of a better way to do this? or can point out any problems in my code?
Also on the recieving end can I use
void loop()
{
uint8_t buf[VW_MAX_MESSAGE_LEN];
uint8_t buflen = VW_MAX_MESSAGE_LEN;
if (vw_get_message(buf, &buflen)) // Non-blocking
{
int i;
digitalWrite(13, true); // Flash a light to show received good message
// Message with a good checksum received, dump it.
Serial.print("Got: ");
for (i = 0; i < buflen; i++)
{
Serial.print(buf[i], HEX);
Serial.print(" ");
}
if(buf[] == 31) //DO whatever
// OR
if(buf[1] == 3 && buf[2] == 1) // DO whatever
Serial.println("");
digitalWrite(13, false);
}
}
