Question Can I use ESC with SMC3 Arduino 3DOF?

Hi everyone,

I have ESC (Speed Controller Dc Motor)
IFIrobotics victor 885

http://www.robotcombat.com/products/images/IFI-883-885-Manual.pdf

I would to use ESC instead of H-Bridge with Arduino and SMC3 code

The ESC have 3 wires PWM only, Not like H-Bridge have PWM and ENA - ENB

Is there anyone who tried the edit on the code?
Do I need to edit the code?
How to wire connections?

So if there is a solution please help

that looks to be a dc speed controller for an RC car/plane.. the PWM signal is a single wire, with the other two being 5v and ground. (white signal, red 5v and black ground)

standard PWM for RC servos are single wire (no direction) with the direction information contained in the signal 'high' time pulse (0.9-2.1ms, with 1.5ms being centered) with a variable low time. I'm not sure how 'mode 2' works on smc3, but wiring would be the same.

In theory it should work. You will still need feedback pots on motors to the arduino SMC3. I also assume that the ESC is capable of driving the Motor you plan to use. A lot of RC ESCs these days are for Brushless DC RC motors - I guess this one is just a DC Motor driver as it only has the two wires to motor.

You would need a few changes in the SMC3 code, first change all the SetOutputsMotor1 (2 and 3) as below:

Code:

void SetOutputsMotor1()
{
    #define ZERO_SPEED_OFFSET 127
    if((Feedback1 > InputClipMax1) && (PWMrev1 != 0))
    {
        PWMout1 = PWMrev1;
        MyPWMWrite(PWMpin1, ZERO_SPEED_OFFSET-(PWMout1/2));
    }
    else if((Feedback1<InputClipMin1) && (PWMrev1 != 0))
    {
        PWMout1 = PWMrev1;
        MyPWMWrite(PWMpin1, (PWMout1/2)+ZERO_SPEED_OFFSET);
    } 
    else if((Target1 > (Feedback1 + DeadZone1)) || (Target1 < (Feedback1 - DeadZone1)))
    {
        if (PWMout1 >= 0) 
        {                                   
            // Drive Motor Forward
            PWMout1+=PWMoffset1;
            if(PWMout1 > (PWMmax1+LiftFactor1)){PWMout1=PWMmax1+LiftFactor1;}
            MyPWMWrite(PWMpin1, (PWMout1/2)+ZERO_SPEED_OFFSET);
        } 
        else
        {                                             
            // Drive Motor Backwards
            PWMout1 = abs(PWMout1);
            PWMout1+=PWMoffset1;
            if(PWMout1 > PWMmax1){PWMout1=PWMmax1;}
            MyPWMWrite(PWMpin1, ZERO_SPEED_OFFSET-(PWMout1/2));
        }
    }
    else
    {
        PWMout1=0;
        MyPWMWrite(PWMpin1, ZERO_SPEED_OFFSET);
    }
}

And then you will need to change the PWM frequency to something like 330Hz or there abouts. Actually I think the default Arduino PWM freq is 360Hz so maybe if you just comment out the code to set the freq it will be right?

This is all untested and not properly researched - I'm just going from memory. You would have to try.

As I always suggest, first try a small dc motor so you don't fry the ESC if it is wrong.

@delcarlo Thanks for your reply and help

@RufusDufus Thanks for your reply and help, I did the whole thing but it does not work!