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If minimum speed limit is reached it turns ON LED4 decspeed() function – this function decreases width of pulse fed to motor by decreasing ON time and increasing OFF time.If maximum speed limit is reached it turns ON LED3 Incspeed() function – this function increases width of pulse fed to motor by increasing ON time and decreasing OFF time.Keydly() function – 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 studio software. So here i am not using inbuilt feature but generating PWM using program.
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But such type of feature is not available in all micro controllers so in that case we have to generate PWM using program. We can use this feature to generate PWM and vary speed of DC motor. While motor is running in clockwise direction if SW2 is pressed, the motor will immediately start rotating in anticlockwise direction and vice versaĪVR microcontrollers have built in feature to generate PWM using internal timer.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.The green LED blinks at rate of PWM frequency When SW1 is pressed momentarily, the motor starts rotating in clockwise direction.Additional 12 V supply is given to L293D chip for motor only Working & Programming.Vcc supply of 5 V is connected to required pins of both chips and pull up resistors.A 16 MHZ crystal with two 22 pF capacitor is connected to crystal input pins XTAL1 & XTAL2.DC motor is connected to output of L293D chip.
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2 LEDs LED5 and LED6 are also connected to these pins through current limiting resistors
ASF AVR CONTROL DC MOTOR DRIVER
The major building blocks of this system are as shown in figure that are ATmega32 and DC motor driver chip L293D. 1: Block Diagram of AVR ATMega32 based DC Motor Controller
ASF AVR CONTROL DC MOTOR HOW TO
So this project demonstrates how to vary the speed and change the direction of simple 12V 500 RPM DC series motor using AVR microcontroller ATmega32.įig. In this technique we shall vary the width of applied pulse that will vary average voltage applied to motor and its speed will change. And for varying speed, there are various ways to vary speed of DC motor but the best amongst them is PWM – pulse width modulation technique. The direction of DC motor can be controlled by just reversing the polarity of given supply. Thus we can count number of such applications where there is a need to change direction and/or speed of DC motor.
ASF AVR CONTROL DC MOTOR PORTABLE
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Industrial application – to change direction and speed of rotating machinery.Robotic application – to change direction and speed of moving robot.Controlling direction and speed of DC motor is very essential in many applications like