libraries/SoftwareSerial/examples/SoftwareSerialExample/SoftwareSerialExample.ino

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+/*
+  Software serial multiple serial test
+
+ Receives from the hardware serial, sends to software serial.
+ Receives from software serial, sends to hardware serial.
+
+ The circuit:
+ * RX is digital pin 2 (connect to TX of other device)
+ * TX is digital pin 6 (connect to RX of other device)
+
+ Note:
+ Not all pins on the Elbear Ace-Uno support interrupts,
+ so only the following can be used for RX:
+ 2, 3, 4, 5, 8, 9
+
+ created back in the mists of time
+ modified 25 May 2012
+ by Tom Igoe
+ based on Mikal Hart's example
+
+ This example code is in the public domain.
+
+ */
+#include <SoftwareSerial.h>
+
+SoftwareSerial mySerial(2, 6); // RX, TX
+
+void setup() {
+  // Open serial communications and wait for port to open:
+  Serial.begin(115200);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  Serial.println("Goodnight moon!");
+
+  // set the data rate for the SoftwareSerial port
+  mySerial.begin(9600);
+  mySerial.println("Hello, world?");
+}
+
+void loop() { // run over and over
+  if (mySerial.available()) {
+    Serial.write(mySerial.read());
+  }
+  if (Serial.available()) {
+    mySerial.write(Serial.read());
+  }
+}