Project Title:

TO CONTROL STEPPER MOTOR WITH COMPUTER

USING SERIAL PORT COMMUNICATION OF MICROCONTROLLER

STEPPER MOTORSTEPPER MOTOR

Difference b/w Rotor & Stator of Stepper & other Motors

Understanding Stepper Motor

Understanding Stepper Motor

Understanding Stepper Motor

CONNECTIONS AND STEP SEQUENCES

SERIAL SERIAL COMMUNICATIONCOMMUNICATION

Serial communication uses 2 methods

• Synchronous method transfers a block of data at a time.

• Asynchronous method transfers a single byte at a time.

Asynchronous serial datacommunication

• A protocol is a set of rules agreed by both the sender and receiver on

• How the data is packed.

• How many bits are for data.

• When the data begins and ends.

Asynchronous

• RS323

• STANDARD

• TTL

• STANDARD

Timers of 8051

• TMOD Register

• TMOD=0x20; //use Timer 1, mode 2

• TH1=0xFA; //4800 baud rate

• TR1=1; //start timer

SCON=0x50;

MOVEMENT,DELAY B/W EACH STEP OF STEPPER MOTORvoid MSDelay(unsigned int);void MSDelay(unsigned int itime){unsigned int i,j;for (i=0;i<itime;i++)for (j=0;j<1275;j++);}P2=0xCC;P2=P2<<1;