DRIVING STEPPER MOTOR USING 555 TIMER AND 4013 IC
This circuit controls the speed of a stepper motor via the 100k pot. The direction of rotation is determined by the double-pole double-throw (DPDT) switch. The stepper motor is a 12v , 110 ohm and has 5 wires: red-black-yellow-brown-orange. The LEDs illuminate via the back-emf of the coils and prevent the spikes entering the transistors. The LEDs will flicker to show the pulses being received by the stepper motor. The 27k stop-resistor limits the upper-frequency of the 555 and prevents the circuit producing pulses that are too fast for the stepper motor. The frequency is produced using 555 timer and output from pin 3 of 555 timer is fed to the clk input of 4013 IC. 4013 dual D-type flip-flop MOS (CMOS) integrated circuit constructed with N- and P-channel enhancement mode transistors. Each flip-flop has independent data, set, reset, and clock inputs and “active low Q” and “active high Q” outputs. The logic level present at the “D” input is transferred to the Q output during the positive-going transition of the clock pulse.
DRIVING STEPPER MOTOR USING SAA1042
Here, 555 timer is used to provide the frequency to the SAA1042 which is a motor driver IC. The desired frequency for driving the stepper motor at an angle can be set by varying the pot.
HOW TO CALCULATE MOTOR SPEED
There are five places where ground must be attached. Since the step motor uses a lot of current, the chip needs to have the ability to sink that current. Make sure you hook up all five GND pins to ground. Also make sure the frequency generated from the 555 timer is of 1 Hz square wave with a 6 volt amplitude and a 3 volt DC offset. Use the pushbutton to advance the step motor, step by step.
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