/* Stepper.cpp - - Stepper library for Wiring/Arduino - Version 0.4 Original library (0.1) by Tom Igoe. Two-wire modifications (0.2) by Sebastian Gassner Combination version (0.3) by Tom Igoe and David Mellis Bug fix for four-wire (0.4) by Tom Igoe, bug fix from Noah Shibley Drives a unipolar or bipolar stepper motor using 2 wires or 4 wires When wiring multiple stepper motors to a microcontroller, you quickly run out of output pins, with each motor requiring 4 connections. By making use of the fact that at any time two of the four motor coils are the inverse of the other two, the number of control connections can be reduced from 4 to 2. A slightly modified circuit around a Darlington transistor array or an L293 H-bridge connects to only 2 microcontroler pins, inverts the signals received, and delivers the 4 (2 plus 2 inverted ones) output signals required for driving a stepper motor. The sequence of control signals for 4 control wires is as follows: Step C0 C1 C2 C3 1 1 0 1 0 2 0 1 1 0 3 0 1 0 1 4 1 0 0 1 The sequence of controls signals for 2 control wires is as follows (columns C1 and C2 from above): Step C0 C1 1 0 1 2 1 1 3 1 0 4 0 0 The circuits can be found at http://www.arduino.cc/en/Tutorial/Stepper */ #include "WProgram.h" #include "Stepper.h" /* * two-wire constructor. * Sets which wires should control the motor. */ Stepper::Stepper(int number_of_steps, int motor_pin_1, int motor_pin_2) { this->step_number = 0; // which step the motor is on this->speed = 0; // the motor speed, in revolutions per minute this->direction = 0; // motor direction this->last_step_time = 0; // time stamp in ms of the last step taken this->number_of_steps = number_of_steps; // total number of steps for this motor // Arduino pins for the motor control connection: this->motor_pin_1 = motor_pin_1; this->motor_pin_2 = motor_pin_2; // setup the pins on the microcontroller: pinMode(this->motor_pin_1, OUTPUT); pinMode(this->motor_pin_2, OUTPUT); // When there are only 2 pins, set the other two to 0: this->motor_pin_3 = 0; this->motor_pin_4 = 0; // pin_count is used by the stepMotor() method: this->pin_count = 2; } /* * constructor for four-pin version * Sets which wires should control the motor. */ Stepper::Stepper(int number_of_steps, int motor_pin_1, int motor_pin_2, int motor_pin_3, int motor_pin_4) { this->step_number = 0; // which step the motor is on this->speed = 0; // the motor speed, in revolutions per minute this->direction = 0; // motor direction this->last_step_time = 0; // time stamp in ms of the last step taken this->number_of_steps = number_of_steps; // total number of steps for this motor // Arduino pins for the motor control connection: this->motor_pin_1 = motor_pin_1; this->motor_pin_2 = motor_pin_2; this->motor_pin_3 = motor_pin_3; this->motor_pin_4 = motor_pin_4; // setup the pins on the microcontroller: pinMode(this->motor_pin_1, OUTPUT); pinMode(this->motor_pin_2, OUTPUT); pinMode(this->motor_pin_3, OUTPUT); pinMode(this->motor_pin_4, OUTPUT); // pin_count is used by the stepMotor() method: this->pin_count = 4; } /* Sets the speed in revs per minute */ void Stepper::setSpeed(long whatSpeed) { this->step_delay = 60L * 1000L / this->number_of_steps / whatSpeed; } /* Moves the motor steps_to_move steps. If the number is negative, the motor moves in the reverse direction. */ void Stepper::step(int steps_to_move) { int steps_left = abs(steps_to_move); // how many steps to take // determine direction based on whether steps_to_mode is + or -: if (steps_to_move > 0) {this->direction = 1;} if (steps_to_move < 0) {this->direction = 0;} // decrement the number of steps, moving one step each time: while(steps_left > 0) { // move only if the appropriate delay has passed: if (millis() - this->last_step_time >= this->step_delay) { // step the motor to step number 0, 1, 2, or 3: stepMotor(this->step_number % 4); // get the timeStamp of when you stepped: this->last_step_time = millis(); // increment or decrement the step number, // depending on direction: if (this->direction == 1) { this->step_number++; if (this->step_number == this->number_of_steps) { this->step_number = 0; } } else { if (this->step_number == 0) { this->step_number = this->number_of_steps; } this->step_number--; } // decrement the steps left: steps_left--; } } } /* * Moves the motor forward or backwards. */ void Stepper::stepMotor(int thisStep) { if (this->pin_count == 2) { switch (thisStep) { case 0: /* 01 */ digitalWrite(motor_pin_1, LOW); digitalWrite(motor_pin_2, HIGH); break; case 1: /* 11 */ digitalWrite(motor_pin_1, HIGH); digitalWrite(motor_pin_2, HIGH); break; case 2: /* 10 */ digitalWrite(motor_pin_1, HIGH); digitalWrite(motor_pin_2, LOW); break; case 3: /* 00 */ digitalWrite(motor_pin_1, LOW); digitalWrite(motor_pin_2, LOW); break; } } if (this->pin_count == 4) { switch (thisStep) { case 0: // 1010 digitalWrite(motor_pin_1, HIGH); digitalWrite(motor_pin_2, LOW); digitalWrite(motor_pin_3, HIGH); digitalWrite(motor_pin_4, LOW); break; case 1: // 0110 digitalWrite(motor_pin_1, LOW); digitalWrite(motor_pin_2, HIGH); digitalWrite(motor_pin_3, HIGH); digitalWrite(motor_pin_4, LOW); break; case 2: //0101 digitalWrite(motor_pin_1, LOW); digitalWrite(motor_pin_2, HIGH); digitalWrite(motor_pin_3, LOW); digitalWrite(motor_pin_4, HIGH); break; case 3: //1001 digitalWrite(motor_pin_1, HIGH); digitalWrite(motor_pin_2, LOW); digitalWrite(motor_pin_3, LOW); digitalWrite(motor_pin_4, HIGH); break; } } } /* version() returns the version of the library: */ int Stepper::version(void) { return 4; }