Motor Stepper Example

[apollo21]

hi.

The following image is a connection of two aspect Yuniporrasteppingmortarmaicrostepping to
LED.
It tries to build the fixed current circuit into following.
It was named Raundorimittoscear.

[apollo21]

[QUOTE=apollo21;68104]hi.
Greetings
Since I posted the previous post, that many more experienced.
Allegro One solution would be achieved at IC.
Another, however, set a vector of phase 2 D / A converter in the conduct,
Sorted by comparing the current signal value and the output switching element is a way to drive.
The current regulation requires the ability to fit the criteria.
Vector miracle two-phase partitioning error occurs from an angle and draw a circle, the intermediate value of 0.7 instead of 0.57 has been announced to be correct.
D / A converters to simplify the PWM can be used.
1bit PDM is called conversion ways, by number, because repetition is undefined, and is not suitable for such use.
MPU is a 2ch analog 2ch and needs of the PWM output.
If you seek to maintain the accuracy of the angular speed 8bit pulse repetition frequency should not be limited to around 6bit.
Thus repetition frequency 6bit seeking 8bit accuracy,
If you use a decentralized approach four times, without sacrificing the angle, fast response can be obtained.
(Many more bit of resolution can be given)
I did a mathematical analysis of Open Office Calc functions.
http://den-nekonoko.blog.so-net.ne.j...o/WS000539.JPG
Can stay if you need more, "6bit_pwm.ods" We attached.
Yours sincerely

[cncmachineguy]

Hello all, after lots of posts with some other members here, and lots of digging on my own, I came to the conclusion for anything over 500mA drive capacity, it really is less expensive to go with a dedicated chip solution. This is when you figure in board space, manufacturing cost, ...

Just my 2 cents FWIW

[thenew]

please help me..we have a project using stepper motor..we are making simple linear robot..when the circuit is on it will automatically open the gripper then after a seconds it will close the grip then after a seconds the slider stepper will turn forward then after a seconds again the gripper will open again then close and back to its original position..

please give me sample code or correct my code because when i tried it the gripper will only vibrate:

clear
ti var byte
c var byte
z var byte
ti=100
trisb=0

gripper open(cw the gripper stepper):
for z=1 to 2
portb=128
pause ti
portb=64
pause ti
portb=32
pause ti
portb=16
pause ti
next z
goto delay

gripper open1(cw the gripper stepper):
for z=1 to 2
portb=128
pause ti
portb=64
pause ti
portb=32
pause ti
portb=16
pause ti
next z
goto delay3

close(reverse gripper stepper):
for z=1 to 2
portb=16
pause ti
portb=32
pause ti
portb=64
pause ti
portb=128
pause ti
next z
goto delay1

close1(reverse gripper stepper):
for z=1 to 3
portb=16
pause ti
portb=32
pause ti
portb=64
pause ti
portb=128
pause ti
next z
goto delay4

delay:
portb=0
pause 2000
goto close

delay1:
portb=0
pause 2000
goto loop
delay2:
portb=0
pause 2000
goto open1

delay3:
portb=0
pause 2000
goto close1

delay4:
portb=0
pause 2000
goto loop1
delay5:
portb=0
pause 2000
goto open

loop(cw the slider):
for c=0 to 11
portb=8
pause ti
portb=4
pause ti
portb=2
pause ti
portb=1
pause ti
next c
pause 2000
goto delay2

loop1(ccw the slider):
for c=0 to 11
portb=1
pause ti
portb=2
pause ti
portb=4
pause ti
portb=8
pause ti
next c
goto delay5
end

[luxornet]

If a stepper motor vibrate this is happen because the power supply is too low or the rotation speed (given by the code) is too high.

[thenew]

what is the correct speed or delay am i using in order to run it well?

it necessary to define the external oscillator in the program?like:

define osc 4

[cncmachineguy]

We really need to know more about the hardware. Are you using a uni-polor or bi-polor motor? How are you driving the motor? direct from the PIC (REALLY small motor) or with some kind of amplifier/driver? I don't think you are pulsing too fast, if you have a 200 step motor, you are asking it to move at 5 RPM (i think,)

Can you make the motor move by replacing the pic with 4 switches? this will simulate the pic to test the hardware. Although this still will not tell you about current needs.