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

[Attila-FIN]

PWM based microstepping (1/2, 1/4, 1/8) has been added to four and two wires H bridge (L293D) configuration. L293D ENABLE pins must be connected to MCU pins.
Two wire configuration has been tested using ESP-12E module with L293D motor shield, but four wires not yet.

[lrmoreno007]

Nice, please merge this.

[nicocesar]

Tested on a NEMA17 motor with a esp12e motor shield and a NodeMcu 1.0 and works like a charm. Please merge this. I'm using @Attila-FIN fork meanwhile

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[lutfylutfy]

// analogWriteFreq(whatSpeed * 100);

[jcarta]

I get two errors with this implementation:

'analogWriteFreq' was not declared in this scope and 'PWMRANGE' was not declared in this scope

How would I resolve these errors?

[mcer12]

@jcarta and anyone else having this issue => analogWriteFreq is ESP8266 only function so this PR will only work on ESP8266.
On STM32 replace analogWriteFreq() with analogWriteFrequency()
On ESP32 it's some more work => use ledcSetup() and use ledcWrite() instead of analogWrite()
On atmega chips it's not as easy and you have to tinker with timers.

[geonick69]

In an attempt to adjust some numerical values on an older sketch I am facing a compilation error: "'PWMRANGE' was not declared in this scope". I am microstepping a 28BYJ-48 with a NodeMCU ESP8266 (ESP-12E) and a L293D Motor Shield. Everything would compile, upload and run without problems with older version of Arduino IDE (not sure which one, it's been a while) and this version of the Stepper library. Any ideas, please?

EDIT: I have been looking into the problem and managed to come across some info suggesting that PWMRANGE was defined up to v2.7.4 of ESP8266 (esp8266/Arduino#8447). Any ideas for a workaround to maintain the microstepping functionality with the current version?

[WhiteLionATX]

In an attempt to adjust some numerical values on an older sketch I am facing a compilation error: "'PWMRANGE' was not declared in this scope". I am microstepping a 28BYJ-48 with a NodeMCU ESP8266 (ESP-12E) and a L293D Motor Shield. Everything would compile, upload and run without problems with older version of Arduino IDE (not sure which one, it's been a while) and this version of the Stepper library. Any ideas, please?

EDIT: I have been looking into the problem and managed to come across some info suggesting that PWMRANGE was defined up to v2.7.4 of ESP8266 (esp8266/Arduino#8447). Any ideas for a workaround to maintain the microstepping functionality with the current version?

Try add to stepper.cpp:
#define PWMRANGE 1023