Motor Stepper Example

[astanapane]

Yep you can find that SPECIFIC MOTOR at sparkfun.

It is not expensive and not with HIGH torque but it is Good for many applications.

[astanapane]

normally i dont open a new thread, i really dont like it, so i will continue the next request from you guys here.

If any moderator would like to open a new thread, it is free to do it. My request is related to motors again, but this time to a brushells motors.

I have the following motor

and Detrum driver 25 A

i would like to control very simply the driver with a PIC and a potentiometer

so they way to rotate the potentiometer to speed up the motor via PWM from PIC.

Is that possible?

have a look first of my new design and what i would like to do.

[rmteo]

...i would like to control very simply the driver with a PIC and a potentiometer

so they way to rotate the potentiometer to speed up the motor via PWM from PIC.

You could do it with a PIC but a $5 servo tester like this would work just as well.

[Ioannis]

The motors are Brushless type and need a special High current driver (at least 30 Amps).

When a specific driver is selected we can see how to control it.

Ioannis

[astanapane]

The motors are Brushless type and need a special High current driver (at least 30 Amps).

When a specific driver is selected we can see how to control it.

Ioannis

For my case i have selected the Dentrum 25A controller for the specific motor. IT works fine.

But i havent checked the input for the controller yet. And dont want to mess around a lot with it. The cost is not too high...about 20 euros.

[Ioannis]

I could not find any datasheet about the Dentrum, but I suppose it is a standard servo input controller.

If this is the case then it just needs pulses every 20ms and from 1 to 2ms wide.

Please confirm the input of the driver.

Ioannis

[Ioannis]

... The cost is not too high...about 20 euros.

Or less: http://www.hobbypartz.com/60p-dye-1002-25a-esc.html

[astanapane]

Hi rmteo,

thanks a lot for your reply, just wanted to use a PIC and a potentiometer, because i would like to understand the programming as well behind it.

Right now i have a reciever and transmitter to do it.

But i would like to use my own pic PWM with potentiometer to send pulses to controller.

[rmteo]

....But i would like to use my own pic PWM with potentiometer to send pulses to controller.

Well then, as mentioned "it just needs pulses every 20ms and from 1 to 2ms wide." Here is a hint, you do not want to use the PIC's PWM module as it will give only about 5.5 bits of resolution.

[Ioannis]

This is a little very simple code to produce the required servo pulse by reading an analog port (say a pot).

It then creates the pulse after some maths and loops back again.

again:
adcin channel,value          'read pot value
if value>250 then value=250  'compress value over 250
pulse=4*value+1000           'upscale from 1000 to 2000
HIGH output_pin
pauseus pulse     'create the servo pulse
low output_pin
pauseus (20000-pulse)' pause for the rest of the 20ms period
goto again

Ioannis

[astanapane]

This is a little very simple code to produce the required servo pulse by reading an analog port (say a pot).

It then creates the pulse after some maths and loops back again.

again:
adcin channel,value          'read pot value
if value>250 then value=250  'compress value over 250
pulse=4*value+1000           'upscale from 1000 to 2000
HIGH output_pin
pauseus pulse     'create the servo pulse
low output_pin
pauseus (20000-pulse)' pause for the rest of the 20ms period
goto again

Ioannis

Right Now i need first to do the schematic and will wait for the printed parts tomorrow morning.

Then I can do the tests.

Thanks a lot Ioannis.