Tutorial SMC3 Arduino 3DOF Motor Driver and Windows Utilities

If you mean that pin 9 is either always on or always off then that is not correct - it should be PWM unless the motor feedback is exactly in the correct target position.

I use the BTS7960 and the wiring in the first post. It's been a long time since I was in the details but I'm pretty sure I wanted it to run in drive/brake (or maybe it was drive/coast) mode hence the wiring config and the special code for MODE2. In whichever mode it was I was trying to achieve, only one H-Bridge PWM signal is driven with PWM output as noted by the wiring diagram.

If you are happy to run the motor in drive/coast mode then you could use MODE1 and connect the PWM signal to both H-Bridge EN pins and connect the ENA and ENB to each of the H-Bridge PWM pins. Although if it's not working I would say something else is wrong as there are others using these h-bridges with SMC3.

thank you

Hi at all,

first of all: @RufusDufus awesome work!!!

I got it to working with my Arduino Mega2560. I have tested around with my own code to understand the BTS7960. Then, I have modified the SMC3 v1.

In the SetOutputsMotor1() from Mode2, I had to replaced

OutputPort &= ~(1 << ENApin1); // Unset Motor2 In 1

throw

digitalWrite(ENApin1, LOW); for unset or digitalWrite(ENApin1, HIGH); for set

and removed the PORTD = OutputPort;

because the pin mapping PORTD will not work on an Arduino Mega, so I did it manually with digitalWrite();

I did also a change in the MyPWMWrite() function. We use the MyPWMWrite in the SetOutputMotor1-3 to send the PWM signals to the motors, but I found in this function the if else statement:

if (val == 0)
digitalWrite(pin, LOW);
else if (val == 255)
digitalWrite(pin, HIGH);
else
{
uint16_t regLoc16 = 0;
uint16_t top;

switch(pin)
{
case 9:
sbi(TCCR1A, COM1A1);
regLoc16 = OCR1A_MEM;
top = ICR1; //Timer1_GetTop();
break;
case 10:
sbi(TCCR1A, COM1B1);
regLoc16 = OCR1B_MEM;
top = ICR1; //Timer1_GetTop();
break;
}
tmp=(tmp*top)/255;
_SFR_MEM16(regLoc16) = tmp; //(tmp*top)/255;
}

I didn't really understand this one - I got only a on or of signal - if val==0 or if val==255. But I thought, that I get the val from the PID controller...
I added a new state,

else if (val > 0 && val < 255)
analogWrite(pin, val);

and after that, it works. With MODE2, EN_R&EN_L are always activated (which is needed for the BTS7960), on PWM i get the PWM signal and on ENApin1 i got on or off for the direction.

I will test it this evening with our chair...

@RufusDufus

there is a new version of the IBT-2

ibt-4 50A

http://www.ebay.co.uk/itm/1Pcs-IBT-...d=253126325997&_trksid=p2047675.c100013.m1986

is this compatible with the SMC3 code ?

Do you gathered some info about this ?

Thanks!

The ibt-4 works by powering itself from the 12v supply and 2 pins for direction pwm.

I was unable to use it because i am running 24v.

I tried it on a different project and it seems to work fine

Hi There,

I have already built my 3dof, 2 x 12v motor system with smc3, with 12v mmShield.
Now I'm planning to change to 3 x 24v motor system to simnulate heave also.
Can anybody help me with a tutorial link about the motor controllers and the
wiring of 24v motors to arduino?

Thanx,
George, Hungary

Hi George - how is your 3dof wired up ?
which motor drivers did you use ?

Gadget999,

It's a classic, mode1 wiring and setup, means I'm using MonsterMoto shield:



This shield is only for 12V motors.
The mode 1 wiring is also on the first page of this tutorial.


Thanx for help,
George

Hi Guys,

If I wire the two Monster Moto output drivers together to drive a single motor using SMC3, as @Pit's wiring, like this:



If I short c. B1-A2, will I get 24v 15A from A1-B2?

Cheers,
George

no, you will damage the MM....the MM doesn't support 24V.

Pit,

So, that is not the same as you connect 2 same batteries in line resulting the volts added?

George

no

Hello @RufusDufus, I recently bought a commercially available 3DOF motion simulator.

I will be using it for research and was wondering if there was a way to control the RPM of the motors using the SMC3.io arduino code. I tried adjusting the value of Ki hoping that would reduce the RPM but it makes the motion jerky. My intent is to use the output testing in simtools to adjust the Roll, Pitch and Yaw and I would like to know if there is a way to adjust the speed of the motors. I won't be using the simulator with a game at all.

Appreciate any help on this from the members. I have read through the entire thread and couldn't find any information for this particular adjustment.

I connected the HBridge driver to a single motor, but it is returning peaks in the power supply.
Has anyone gone through the same thing?
When using the SMC3 in sinusozo movement, it does not read the last 10% upwards

Is there a wiring diagram on connecting the IBT-4 controller board to the arduino? I am currently using the IBT-2 and I think one is bad.

Thanks
Terry.

Hi,
i wahr to use SMC3 on my 2dof Seatmover. Unfortunatly ScUtil says"connection error abort or ignor".
com ports are set correct.
Any ideas?
Martin

Hi everyone,

After roasting a couple of chinesse MM boards I have tried these H-bridges from POLOLU:



https://www.pololu.com/product/2994

They are able to handle 25Amps in continuous mode and 60 amps peaks no heat sink needed, I have play them quite hard this weekend and they are still alive. I will post more details on my building thread, but if some one is looking for MM alternatives using SMC3, this ones worked for me.

MM are cheap and work good, but the delivery time and the faulty rates made me consider some other options. Pololu customer support is great and they recomended me these boards.
As far as I notice seems that no one have tried them before, so here is my little aportation.

Juan