Microstepping has been added for bipolar (2 and 4 wire configuration) stepper motor.

examples/Microstepping/Microstepping.ino

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+/*
+Stepper Motor Control - revolutions with microstepping
+
+This program drives a bipolar stepper motor in microstepping mode.
+The motor is attached to digital pins D1-D4 of an ESP-8266.
+D3, D4 are connected to the direction pins, D1 and D2 are connetec to the PWM/ENABLE pins of the L293D H bridge chip.
+
+The motor swings the same number of steps clockwise and back.
+
+
+Created 17 Mar. 2017
+by Attila Kov�cs
+
+*/
+
+#include "Stepper.h"
+
+#define DIR_MOTOR_A D3
+#define DIR_MOTOR_B D4
+#define PWM_MOTOR_A D1
+#define PWM_MOTOR_B D2
+
+const int stepsPerRevolution = 48;  // change this to fit the number of steps per revolution
+const int microSteps = 8;			// valid values are 2, 4, 8
+int revolutions = 2;				// number of revoluations
+int stepsToSwing = microSteps * stepsPerRevolution * revolutions; //number of steps to do
+int motorRpm = 100;					// motor speed
+
+
+// stepper motor with 8 microstpesinitialized, pin D3, D4 are connected to the H bridge chip inputs,
+// D1 (PWM_MOTOR_A) and D2 (PWM_MOTOR_B) are connected to the enable pin of the H bridge chip
+Stepper myStepper(stepsPerRevolution, true, microSteps, DIR_MOTOR_A, DIR_MOTOR_B, PWM_MOTOR_A, PWM_MOTOR_B);
+
+// driving without microsteps
+// DO NOT forget to adjust the number of steps to do, since there is no microstepping used. (microSteps = 1;)
+//Stepper myStepper(stepsPerRevolution, D3, D4);
+
+
+void setup() {	
+	// Set the PWM/enable pins.
+	// Only needed in the case of full step drive. Not needed for microstep mode.
+	pinMode(PWM_MOTOR_A, OUTPUT);
+	pinMode(PWM_MOTOR_B, OUTPUT);
+	digitalWrite(PWM_MOTOR_A, HIGH);	
+	digitalWrite(PWM_MOTOR_B, HIGH);
+
+	// set the speed of the motor
+	myStepper.setSpeed(motorRpm);
+	// initialize the serial port:
+	Serial.begin(250000);
+}
+
+
+void loop() {
+	// Swing clockwise.
+	Serial.println("clockwise");
+	myStepper.step(stepsToSwing);	
+	myStepper.off();
+	yield();
+	delay(500);
+	yield();
+
+	Serial.println("counterclockwise");
+	// Swing to the other direction.
+	myStepper.step(-stepsToSwing);
+	yield();
+	myStepper.off();
+	delay(500);
+	yield();
+}