Motor control with PIC 16F84

[dekiz77]

I'm new in microcontrollers.The project I have to complete is :speed regulation of electromotor ( It's my decision which type )Could someone help me with this problems :
which electromotor is the best solution for control ( stepper or servo ) and what kind of a motor can I find in car toys?
the speed of the motor is controled via potentiometer
Greetings!

 

[don.vito]

hi
i think cd-rom, vcd player or walkman motors good for the microcontrollers.

 

[dekiz77]

hi
i think cd-rom, vcd player or walkman motors good for the microcontrollers.

Thank you for interesting.
Does anyone have a scheme for stepper motor control with PIC and potentiometer.
I need help for this project. Is it easier to use stepper motor driver chip(like UNC 5804 ) or to control with transistors.

 

[Nigel Goodwin]

You need to be more explicit about EXACTLY what you're trying to do, different motor types are suitable for different applications - also, what do you mean by 'control' - speed?, position?, direction?, number of turns?.

 

[dekiz77]

You need to be more explicit about EXACTLY what you're trying to do, different motor types are suitable for different applications - also, what do you mean by 'control' - speed?, position?, direction?, number of turns?.

The task is to control the speed of the motor via potentiometar. No feedback, no LED indication,just simple control- I need to speed up and slow down the motor.I'm a beginner in microcontrollers and electronics and my main problem is which type of motor to choose and electronic scheme of the circuit.My friend have an old ink-jet, Lexmark, and I can use the stepp motor from it, or is there some other types of motors which are easier to control.Any advice and scheme could help.

 

[Nigel Goodwin]

Depends what you mean by 'speed'? - you can easily change the power to a DC motor using PWM, but without feedback the speed will vary with the load. A stepper motor doesn't really rotate, it moves one step at a time, by stepping it fast enough you give the illusion of smooth rotation - but they are very much slower than a DC motor - perhaps a couple of hundred RPM's?.

Assuming very slow speed is all that's required?, then a stepper would allow you to accurately set the speed - so is probably the best option.

 

[dekiz77]

Depends what you mean by 'speed'? - you can easily change the power to a DC motor using PWM, but without feedback the speed will vary with the load. A stepper motor doesn't really rotate, it moves one step at a time, by stepping it fast enough you give the illusion of smooth rotation - but they are very much slower than a DC motor - perhaps a couple of hundred RPM's?.

Assuming very slow speed is all that's required?, then a stepper would allow you to accurately set the speed - so is probably the best option.

Exactly. The task is just to change the speed of the motor it doesn't matter which type of motor I use. There would be no load on the motor's shaft I just have to show that with adjusting potentiometar I can increase or decrease the speed of the shaft. So any help with electonic scheme would be welcome and advice which program to use ( easier to learn ) : asemler, microC or microBasic.

 

[Nigel Goodwin]

In that case I would probably use a stepper, you can control the speed of it very accurately, and because it's slow the speed change is very obvious.

As you're using an antique PIC, it doesn't have analogue inputs - but if you check my joystick tutorial that shows how to read a pot using a simple capacitor charging technique.

 

[dekiz77]

In that case I would probably use a stepper, you can control the speed of it very accurately, and because it's slow the speed change is very obvious.

As you're using an antique PIC, it doesn't have analogue inputs - but if you check my joystick tutorial that shows how to read a pot using a simple capacitor charging technique.

I find 2 schemes for the circuit, what do you think about it?Which is better on your opinion?

 

[Nigel Goodwin]

Personally I'd use the one with the transistors, there's no need for a driver IC, it's simple to perform the stepping in the PIC.

 

[dekiz77]

Personally I'd use the one with the transistors, there's no need for a driver IC, it's simple to perform the stepping in the PIC.

Thank you for advice. Best wishes.

 

[Nagraju T]

pic16f84

i need source code for interfacing stepper motor using 16f84 controller plz send interface diagram and codes..........

 

[Nagraju T]

nagarajuec_e@yahoo.co.in