[Coffee is love]

How do I make it so in the serial monitor I can type start or stop and have a dc motor spin or not spin lol, I see 200 million tutorials everywhere that are like hook up IC's and diode's and everything in existence just to have a DC motor turn on and off none that are like type start in serial to tell the arduino to turn that on.. nothing like that for some reason.

[Zilog80]

#200,000,001 tutorial:

http://www.letsarduino.com/project-22-ar...unication/

[Coffee is love]

but that has a separate C# program.. do I not need to use that?

[Chappie]

If you are talking about communicating through serial ports, I made a tutorial here on HF quite a while ago.

https://hackforums.net/showthread.php?tid=2051683

Is this what you are looking for?

[Oliver Sykes]

Well, I mean, the only lines of real importance that I see in the c# are the following:

Code

serialPort1.Open();
//and
byte[] b = BitConverter.GetBytes(PWM);
                serialPort1.Write(b, 0, 4);

As far as I can tell, most of the rest is for the GUI, but I've never really messed with Arduinos, so eh.

[Coffee is love]

YES Peefer, that is what I mean't lol I had the rest down just didn't know how to be like hey light1 via serial to have it work

[Chappie]

YES Peefer, that is what I mean't lol I had the rest down just didn't know how to be like hey light1 via serial to have it work

Glad to help!