Stepper Motor (bipolar)

Stepper motors are very accurate motors that are commonly used in computer disk drives, printers and clocks. Unlike dc motors, which spin round freely when power is applied, stepper motors require that their power supply be continuously pulsed in specific patterns. For each pulse, the stepper motor moves around one ‘step’, often 7.5 degrees (giving 48 steps in a full revolution).

There are two main types of stepper motors - Unipolar and Bipolar. Unipolar motors usually have four coils which are switched on and off in a particular sequence. Bipolar motors have two coils in which the current flow is reversed in a similar sequence.

Related Commands:

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Schematic

PCB

Move a bipolar stepper motor

Description

Code Example:
	let dirsB = %00001111			; make pins output
main:	for b3 = 0 to 99 			; start a for...next loop
	  gosub lstep				; call left step sub-procedure
	next b3					; next loop
	for b3 = 0 to 99			; start a for...next loop
	  gosub rstep				; call right step sub-procedure
	next b3					; next loop
	goto main				; repeat

lstep:	let b1 = b1 + 1				; add 1 to variable b1
	gosub stepit				; do the step
	return

rstep:	let b1 = b1 - 1 			; subtract 1 from variable b1
	gosub stepit				; do the step
	return

stepit:	let b1 = b1 & %00000011 		; mask lower two bits of b1
	lookup b1,(%1010,%1001,%0101,%0110),b2	; lookup code into b2
	let pinsB = b2				; output b2 onto control lines
	return
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Create Module

A bipolar stepper motor has 4 wires (2 pairs of coils). It can therefore be controlled by using two of the L293D motor driver create modules.

Bill of Materials

DescriptionCodeQty
Bipolar stepper motor ? 1 Buy Now
L293D motor driver ICO030 1 Buy Now
16-pin 0.3" DIP IC Socket ICH016 1 Buy Now
100nF Miniature Polyester Capacitor CAP001 1 Buy Now

Simulation

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