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Jun 17th, 2019
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  1. #include <SoftwareSerial.h>
  2.  
  3. void setup() {
  4.    Serial.begin(4800);
  5. }
  6.  
  7. void loop() { // run over and over
  8.     int v = Serial.read();
  9.     if (v >= 0) {
  10.         Serial.write(v);
  11.     }
  12. }
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