TX and RX

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

Hello all!
Can anyone explain to me how to use the pin 0 / 1 on the arduino
duemillanove? I only have one arduino but I want to get another
one soon (maybe I'll buy myself one for christmas?). What I was
wondering is this - is it possible to get two arduinos to talk to eachother
with these pins, and if so, how?

I am also planning on buying the arduino nano, if I do get one.

Thanks everyone,
Onions

2

Yes you can make two Arduinos talk just connect Tx from Arduino 1 to RX on Arduino 2 and RX from Arduino 1 to Tx on Arduino 2. You must also connect the two Arduinos grounds together and of course make sure you have identical baudrates defined in your serial.begin on the two boards programs

3

Sounds simple!
Is there a library or code line to get them talking?

Thanks, Onions

4

Serial.println() and Serial.read() on the other side
read - http://arduino.cc/en/Reference/serial

5

Well that is simple!

6

Some things in life are :slight_smile:
If you want to experiment more you might try the NewSoftSerial library, that enables a serial port on "any" pair of pins.

7

Don't forget to put

Serial.begin(your_speed_here); // such as 9600
Serial.flush; // clears out the receive register to start.

in void (setup) on both sides.
and test for
if Serial.available() >0;

before you try reading any characters.