if you want to control the

[D.V.G. Krishna]

if you want to control the speed of motor then follow the logic

 

use a LDR(light dependent resistor)

commet one end to Vcc and other end to a 10K resistor. other end of resistor to ground.

take out put from LDR and resistor interface

give it to an ADC

 

to drive the stepper motor use ULN2003 IC

 

read adc

 

motor port =0x01;

delay(adc value);

motor potr=0x02;

delay(adc value);

motor port=0x04;

delay(adc value);

motor port=0x08;

delay(adc value);