Serial1. This example makes use of one of Arduino Mega's 3 auxiliary serial. Sometimes, one serial port just isn't enough When trying to communicate with multiple serial enabled devices, while also sending info back to the main serial window, a few extra RX/TX ports can be a welcomed thing. ok here is the code with comments boolean printonce=1 Use two of the serial ports available on the Arduino Mega. However that is Serial1 output (Tx), not Serial1 input (Rx) so we never receive anything on Serial1.That is picked up (if Serial.available) and that byte is now written back to Serial1.To use these pins to communicate with your personal computer, you will need. The Arduino Mega has three additional serial ports: Serial1 on pins 19 (RX) and 18 (TX), Serial2 on pins 17 (RX) and 16 (TX), Serial3 on pins 15 (RX) and 14 (TX). Because of the wire, that appears on Serial input (pin 0) The Arduino Mega 2560 is programmed using the Arduino Software (IDE), our Integrated Development Environment common to all our boards and running both online and offline. Click the serial monitor button in the toolbar and select the same baud rate used in the call to begin ().We send "R" to Serial1 (so it goes out on pin 1, and in on pin 19).Thus, there is never anything available on Serial1 input.Īnd that actually makes sense, if you stare at it long enough. The only way for no output to appear on the serial monitor is if the line marked "send to serial monitor" never sends anything. Pin1 is the UART0 TX, which is used with Serial1 it seems, and is labelled GP0. Serial1.write(inByte) // <- send to Serial input I have looked in the pinsarduino.h file and that only seems to reveal the Analog pins, but I just am unsure how to map the GPIO names on the board itself with what gets used in the IDE. Serial.write(inByte) // <- send to serial monitor Looking at your code: boolean printonce=1 Connect the RX pin and TX pins of your device to the TX1 and RX1 pins of your Mega, as shown in the schematic below. Constant output on pin 0/18 (on the scope) - it looks like it is looping sending "Ready".You have set up an infinite loop of echoing back the "Ready" word. What is happening here is that you are printing "Ready" and that is being sent to the other serial port which receives "Ready" which then prints it, it gets received again, and prints it again, and so on. If you disconnect the wires connecting the pins, it prints the message once. Now I expect to see "In setup" followed by "Ready" followed by input from my serial monitor, echoed. Serial communication on pins TX/RX uses TTL logic levels (5V or 3.3V depending on the board). Click the serial monitor button in the toolbar and select the same baud rate used in the call to begin (). If you modify the sketch slightly: boolean printonce = 1 You can use the Arduino environment’s built-in serial monitor to communicate with an Arduino board.
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