MIAC dsPIC - Stepper Motor

[Jay Dee]

Hi Guys,
another basic MIAC question,
I'm hooking up a small stepper to the motor outputs A,B,C,D
So I set the connections in the stepper properties as;
Coil1 PortD.4
Coil2 PortD.5
Coil3 PortD.6
Coil4 PortD.7
and have called the stepper enable at the start of the FC

MIAC_dsPIC_Stepper.fcfx

stepper miac

(9.05 KiB) Downloaded 346 times

This sims OK. But I get nothing on the actual hardware.
Are these the correct ports for the motor outputs?
thanks, J.

[Benj]

Hello,

Yes those are the right pins for the transistor outputs.

As well as enabling the stepper motor you will also need to enable the transistor outputs by writing a logic 1 to pins F0 (A/B) and F1 (C/D).

This usually happens behind the scenes when you call the Output on or Output off commands.

[Jay Dee]

Thanks Ben,
Ah, I see those pins now. Motors1 RF0 & Motors2 RF1.
I note that the later generation MIACs have a few more features on the outputs, such as the half bridges.
Is there any more info on these?

[LeighM]

Hi,
The downloadable PDF datasheet is quite comprehensive.
Don't know if you have it?
See the MIAC resource page if not.
Suggestions for additional info welcome.
Leigh

[Jay Dee]

for anyone playing along..
Very simple example but none the less,

MIAC_dsPIC_Stepper.fcfx

stepper

(9.36 KiB) Downloaded 443 times

shows a basic direct connection of a stepper to MIAC motor output pins.
J.