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digistump-avr/libraries/VirtualWire/examples/transmitter/transmitter.pde

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+// 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 (mikem@airspayce.com)
+// 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");
+
+    // Initialise the IO and ISR
+    vw_set_ptt_inverted(true); // Required for DR3100
+    vw_setup(2000);	 // Bits per sec
+}
+
+void loop()
+{
+    const char *msg = "hello";
+
+    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);
+}