added lwtx + lwrx

sniff_tweeter/sniff_tweeter.ino

@@ -12,13 +12,16 @@
 #include <EEPROM.h>
 #include <Twitter.h>
 #include "Tweet.h"
+#include <LwRx.h>
+#include <LwTx.h>
 
 #define LEDPIN 13
 #define AIRQUALITYPIN A0
 #define TWEET_DELTA (5L * 60L)
 
 int smell = 0; // air quality value
-boolean lit = false;
+long transmitTimeout = 0;
+byte len = 10;
 
 byte mac[] = { 0x64, 0xA7, 0x69, 0x0D, 0x21, 0x21 };
 
@@ -28,14 +31,12 @@ uint16_t twitter_port = 80;
 unsigned long last_tweet = 0;
 
 char buffer[512];
-
 Twitter twitter( buffer, sizeof( buffer ));
 
 void setup ( ) {
   pinMode( LEDPIN, OUTPUT );
   Serial.begin( 115200 );
   Serial.println( F( "Sniff tweeter" ));
-
   if ( Ethernet.begin( mac )) {
     Serial.print( F( "DHCP: " ));
     Ethernet.localIP( ).printTo( Serial );
@@ -48,20 +49,44 @@ void setup ( ) {
   twitter.set_client_id( consumer_key, consumer_secret );
   twitter.set_account_id( oauth_token, access_token_secret );
   delay( 500 );
+  lwrx_setup( 2 ); // set up with rx into pin 2
+  lwtx_setup( 3, 10 ); // transmit on pin 3, 10 repeats
+  delay( 500 );
 }
 
 void loop ( ) {
+  if ( lwrx_message( )) {
+    byte msg[len];
+    lwrx_getmessage( msg, &len );
+    char tweet[140] = "";
+    sprintf( tweet, "%x%x%x%x%x%x%x%x%x%x - %x%x%x%x%x set %x%x %x (%x%x) #arduino", msg[0], msg[1], msg[2], msg[3], msg[4], msg[5], msg[6], msg[7], msg[8], msg[9], msg[4], msg[5], msg[6], msg[7], msg[8], msg[9], msg[2], msg[3], msg[0], msg[1] );
+    Serial.print( F( "Tweeting: " ));
+    Serial.println( tweet );
+    Serial.print( freeRam( ));
+    Serial.println( F( " bytes free" ));
+    delay( 500 );
+  }
   smell = analogRead( AIRQUALITYPIN );
   if ( smell > 600 ) {
     Serial.print( F( "air: " ));
     Serial.println( smell );
+
+    if ( lwtx_free( )) {
+      // message to turn the lights on or something
+      byte msg[] = { 0x00, 0x00, 0x00, 0x01, 0x0F, 0x00, 0x0D, 0x0C, 0x02, 0x08 };
+      lwtx_send( msg );
+      transmitTimeout = millis( );
+    }
+    while ( ! lwtx_free( ) && millis( ) < ( transmitTimeout + 1000 )) {
+      delay( 10 );
+    }
+    transmitTimeout = millis( ) - transmitTimeout;
+    Serial.print( millis( ));
+    Serial.print( F( " msg sent:" ));
+    Serial.println( transmitTimeout );
+
     if ( twitter.is_ready( )) {
       unsigned long now = twitter.get_time( );
-      if ( last_tweet == 0 ) {
-        Serial.print( F( "Now: " ));
-        Serial.println( now );
-        last_tweet = now - TWEET_DELTA + 15L;
-      }
       if ( now > last_tweet + TWEET_DELTA ) {
         char msg[140];
         sprintf( msg, "Smell; air: %d #arduino", smell );
@@ -77,7 +102,44 @@ void loop ( ) {
       }
     }
   }
-  lit = !lit;
-  digitalWrite( LEDPIN, lit );
-  delay(( 1023 - smell ) * 2 );
+  /* lit = !lit;
+  Serial.println( lit );
+  digitalWrite( LEDPIN, lit ? HIGH : LOW );
+  delay(( 1023 - smell ) * 2 ); */
+}
+
+/**
+ * turn a hex value into char for display, like sprintf
+ */
+char alpha ( byte a ) {
+  return ( char )( a < 10 ? a + 48 : a + 55 );
+}
+
+/**
+ * get a useful string out of an array of bytes
+ */
+char * tos ( byte * msg, int start, int end ) {
+  Serial.print( F( "From " ));
+  Serial.print( start );
+  Serial.print( F( " to " ));
+  Serial.print( end );
+  Serial.print( F( "=" ));
+  char * name = "";
+  name[0] = 0;
+  int index = 0;
+  for ( int i = start; i < end; i ++ ) {
+    name[index++] = alpha( msg[i] );
+  }
+  name[index++] = '\0';
+  Serial.println( name );
+  return name;
+}
+
+/**
+ * From http://playground.arduino.cc/Code/AvailableMemory
+ */
+int freeRam ( ) {
+  extern int __heap_start, *__brkval; 
+  int v; 
+  return (int) &v - ( __brkval == 0 ? (int) &__heap_start : (int) __brkval ); 
 }