Remote stepper, a whole turn a press, on an Arduino Uno

// Remote stepper: two buttons on the IR remote turn a stepper a whole turn.
//
//   IR receiver   S (OUT) -> pin 12, - -> GND, + -> 5V
//   ULN2003 board IN1 -> pin 8, IN2 -> pin 9, IN3 -> pin 10, IN4 -> pin 11
//                 + -> 5V, - -> GND
//
// Press >>| (the remote's command 0x40) and the shaft turns one whole turn
// clockwise; press >|| (command 0x43) and it turns one whole turn back. The
// 28BYJ-48 takes 2048 steps for one turn of its output shaft.
//
// The Stepper library wants the pins in the order IN1, IN3, IN2, IN4: that
// is why the constructor below says 8, 10, 9, 11.

// The handset speaks NEC, so only that decoder is compiled in, as IRremote's
// own examples do to save flash.
#define DECODE_NEC
#include <IRremote.hpp>
#include <Stepper.h>

const int RECEIVER_PIN = 12;
const int STEPS_PER_TURN = 2048;
const uint8_t TURN_FORWARD = 0x40;
const uint8_t TURN_BACK = 0x43;

Stepper motor(STEPS_PER_TURN, 8, 10, 9, 11);

void release() {
  // Let the coils go after a move, so the driver stays cool.
  for (int pin = 8; pin <= 11; pin++) digitalWrite(pin, LOW);
}

void setup() {
  Serial.begin(9600);
  IrReceiver.begin(RECEIVER_PIN, ENABLE_LED_FEEDBACK);
  motor.setSpeed(15);
  Serial.println("Mokxi Uno: remote stepper. >>| turns it forward, >|| back.");
}

void loop() {
  if (!IrReceiver.decode()) return;
  bool repeat = IrReceiver.decodedIRData.flags & IRDATA_FLAGS_IS_REPEAT;
  uint8_t command = IrReceiver.decodedIRData.command;
  IrReceiver.resume();
  if (repeat) return;
  if (command == TURN_FORWARD) {
    Serial.println("one turn clockwise");
    motor.step(STEPS_PER_TURN);
    release();
  } else if (command == TURN_BACK) {
    Serial.println("one turn back");
    motor.step(-STEPS_PER_TURN);
    release();
  } else {
    Serial.print("button 0x");
    Serial.print(command, HEX);
    Serial.println(" does nothing here");
  }
  // Any presses that came in while the motor turned are old news.
  IrReceiver.resume();
}