Serial Connection Between Two Arduinos

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1

Hello, firstly I am new to Arduino, so I am sorry for the question. :slight_smile:

I want to make a humanoid robot and use a lot of servo each part.
For example first Arduino will control 6 servos for mouth and second Arduino will handle 4 servos for eyes.

I want to have some kind like a central unit Arduino who send command via serial port to the other Arduino.
I have tried to connect pin TX from central unit Arduino to pin RX of other Arduino, but it is not work.

So anybody here now how to send serial command from Arduino to other Arduino?
So basically between one Arduino and others will receive the same command.

2

I have tried to connect pin TX from central unit Arduino to pin RX of other Arduino, but it is not work.

It does work if done properly, post the code you are using.

So basically between one Arduino and others will receive the same command.

Do the slaves have to talk back to the master? If not this is easy, just connect the master Tx to the slave Rx pins.

If the slaves have to talk back it's a bit more difficult.

Rob

3

Do you have the arduino grounds connected?

4

Do you have the arduino grounds connected?

Dang, I always forget to ask that :slight_smile:

Rob

5

Graynomad:

Do you have the arduino grounds connected?

Dang, I always forget to ask that :slight_smile:

Rob

Ahhh thanks... It is work... one question what I2C btw? I saw some tutorial about connecting master and slaves Arduino using I2C... :roll_eyes: