Trying to do serial communication between 2 Arduino Unos. Code:
#include int ledPin = 13; int board; // 1 = Uno. 2 = Mega. int on_off; // 1 = On. 0 = Off. int buzzerPin = 9; int Ack_tx = 2; //Acknowledgement tx. int rec; void setup() < Serial.begin(9600); // start serial communication at 9600bps Serial1.begin(9600); // start serial1 communication at 9600bps pinMode(ledPin, OUTPUT); pinMode(buzzerPin, OUTPUT); Serial.flush(); Serial1.flush(); >// End Setup void loop() < Serial.println("Enter Uno=1/Mega=0 . "); //Select board // if(!Serial)< board = Serial.read();>while(Serial.available()==0) < // Wait for User to Input Data >board = Serial.parseInt(); //Read the data the user has input Serial.println("Enter LED On=1/Off=0 . "); //Select On or Off while (Serial.available()==0) < // Wait for User to Input Data >on_off = Serial.parseInt(); Serial.println(); switch (board) < case 0: //Mega board if (on_off == 1) digitalWrite(ledPin, HIGH); //Select Uno LED On else digitalWrite(ledPin, LOW); //Select Uno LED Off break; //End Case case 1: //Uno board //Serial.println("Off to Uno. "); //Send on_off info to Uno Serial1.write(on_off/256); //Send the Quotient or "how many times" value Serial1.write(on_off%256); //Send the Modulo or Remainder. delay(50); //Wait for the serial port. while(Serial1.available()<2) //Wait for 2 bytes to arrive < //do nothing >//End While byte b1=Serial1.read(); //Read Upper byte byte b2=Serial1.read(); //Read Lower byte rec=(b1*256)+b2; if (rec == Ack_tx) tone(buzzerPin, 300, 300); //Ack_tx from Uno break; > //End Switch Case > Arduino: 1.8.5 (Windows 10), Board: "Arduino/Genuino Uno" C:\Users\Akshit\Documents\Arduino\sketch_mar06a\sketch_mar06a.ino: In function 'void setup()': sketch_mar06a:13: error: 'Serial1' was not declared in this scope Serial1.begin(9600); // start serial1 communication at 9600bps ^ C:\Users\Akshit\Documents\Arduino\sketch_mar06a\sketch_mar06a.ino: In function 'void loop()': sketch_mar06a:51: error: 'Serial1' was not declared in this scope Serial1.write(on_off/256); //Send the Quotient or "how many times" value ^ Multiple libraries were found for "SoftwareSerial.h" Used: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\SoftwareSerial Not used: C:\Program Files (x86)\Arduino\libraries\SoftwareSerial exit status 1 'Serial1' was not declared in this scope This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences. This is a very basic problem I know, but nothing on the internet is helping.