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examples/ask/ask_transmitter/ask_transmitter.ino

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+// ask_transmitter.pde
+// -*- mode: C++ -*-
+// Simple example of how to use RadioHead to transmit messages
+// with a simple ASK transmitter in a very simple way.
+// Implements a simplex (one-way) transmitter with an TX-C1 module
+// Tested on Arduino Mega, Duemilanova, Uno, Due, Teensy, ESP-12
+
+#include <RH_ASK.h>
+#ifdef RH_HAVE_HARDWARE_SPI
+#include <SPI.h> // Not actually used but needed to compile
+#endif
+
+RH_ASK driver;
+// RH_ASK driver(2000, 4, 5, 0); // ESP8266 or ESP32: do not use pin 11 or 2
+// RH_ASK driver(2000, 3, 4, 0); // ATTiny, RX on D3 (pin 2 on attiny85) TX on D4 (pin 3 on attiny85), 
+// RH_ASK driver(2000, PD14, PD13, 0); STM32F4 Discovery: see tx and rx on Orange and Red LEDS
+
+void setup()
+{
+#ifdef RH_HAVE_SERIAL
+    Serial.begin(9600);	  // Debugging only
+#endif
+    if (!driver.init())
+#ifdef RH_HAVE_SERIAL
+         Serial.println("init failed");
+#else
+	;
+#endif
+}
+
+void loop()
+{
+    const char *msg = "hello";
+
+    driver.send((uint8_t *)msg, strlen(msg));
+    driver.waitPacketSent();
+    delay(200);
+}