Arduino mega2560 + MD25

Other Hardware Motors, Mechanics, Power and CNC
1

Hello,
I'm a new Arduino user and I'm trying to comunicate an Arduino mega2560 with a MD25 (engine controller).
I've connected MD25 ground with GND of the Arduino board and also SDA with pin 20 and SCL with pin 21 (with their corresponding pull-up resistors).
I have attached the code used.
I tried it but it doesn't work, nothing happens, no move, no green led....
Can anyone help me?
Maybe I am asking simple things, but I don't know anything about this....

Thanks

Carme

sketch_feb12a.ino (8.56 KB)

2

pinMode ? The Wire library doesn't seem to call pinMode on SCL or SDA pins....

3

SCL and SDA ara input's or outputs?

I though it wasn't necessary because Ardunimega 2560 has specific pins for I2C.

Can you help with that configuration?

Thanks

4

By default everything is set as an INPUT. Some libraries call pinMode() for you, some don't.

5

I've added this two line to the code

pinMode(20, OUTPUT);
pinMode(21, OUTPUT);

But nothing happens.....

6

Post the sketch you are trying to run.

7

Here it is.

Sorry, I though it was already attached.

sketch_feb12a.ino (8.56 KB)

8

Problem solved!
There was a problem with GND connection.

Thanks