Stepper motor codevisionavr how to#

Incspeed() function вЂ“ this function decreases delay applied between pulse (increases PRF) fed to motor by decreasing time of delay loop library function.

Keydly() function вЂ“ this function generates key debounce delay of approx 0.2 sec that is required when key is pressed.

Complete program is made up of different functions Its compiled and simulated using AVR studioВ software.

While motor is running in clockwise direction if SW2 is pressed, the motor will immediately start rotating in anticlockwise direction and vice versa.

When max or min limit is reached, the corresponding LED3 or LED5 will be ON

If anyone keep on pressing SW4 or SW5 then speed will keep on increasing or decreasing.

Now if SW4 or SW5 button is pressed, the motor speed will increase or decrease.

When SW1 is pressed momentarily, the motor starts rotating in clockwise direction.

Vcc supply of 5 V is connected to required pins of both chips and pull up resistors Working & Operations.

A 16 MHZ crystal with two 22 pF capacitor is connected to crystal input pins XTAL1 & XTAL2.

Two common terminals of motor are connected to 5 V Vcc supply.

4 terminals of stepper motor are connected to output of ULN2003A chip.

See also Servo Motor Control by Using AVR ATmega32 Microcontroller So let us start with system block diagram. It alters pulse sequence to change the direction and varies pulse duration (PRF) to vary the speed of motor.

Stepper motor codevisionavr how to#

So this project demonstrates how to vary the speed and change the direction of given stepper motor using AVR microcontroller ATmega32. If PRF is increased the pulse duration decreases and speed increases and vice versa. Now to change the speed of motor we have to change pulse repetition frequency (PRF) that is the frequency of applied pulses. The common terminal is connected to вЂ“Ve (Gnd) terminal.So as we apply this four steps sequence continuously, the motor will rotate clockwise or anticlockwise. Note вЂ“ in the above sequence вЂ1вЂ™ indicate the coils are given +Ve supply. In five terminals stepper motor one end of all four coils are shorted and taken out as single common terminal that is to be connected to +Ve / -Ve terminal.Now to rotate motor (clockwise or anticlockwise) pulses has to be applied to these four coil terminals in following sequence.

The remaining four terminals of each coil are used to rotate motor. These two common terminals are always connected to +Ve / -Ve terminal of supply. In six terminals stepper motor one end of two coils is shorted and taken out as common terminal. There can be six terminals or five terminals. In unipolar stepper motor there are four coils. So first let us understand how to rotate unipolar stepper motor But to vary the speed or to alter the direction of motor one has to first understand how unipolar stepper motor rotates. Max RPM: вЂ“ 60In this project I am varying speed and altering rotating direction of motor.In this project I have used unipolar type stepper motor with following ratings There are different types of stepper motors permanent magnet, variable reluctance, unipolar, bipolar etc. Communication application вЂ“ to lock the position of satellite dish antenna at specific angle.Domestic application вЂ“ to open or close window shutter / curtain / blinds etc.Defence application вЂ“ to fire a shell or to launch missile at perfect angle.Disk drive application (CD drive, HDD) вЂ“ to position reading head at specific position.Robotic application вЂ“ to move robotic arm to specific position, to move robo-vehicle in specific direction at specific angle Stepper motor is used in many applications like:

It rotates in number of steps as per applied number of pulses. Unlike AC or DC motor that rotates continuously, stepper motor rotates in steps. Stepper motor can be termed as digital motor because it operates on pulses.