DC Motor Support

components/src/main/java/com/opensourcewithslu/components/controllers/MotorController.java

@@ -0,0 +1,45 @@
+package com.opensourcewithslu.components.controllers;
+
+import com.opensourcewithslu.outputdevices.MotorHelper;
+import com.pi4j.io.gpio.digital.DigitalOutput;
+import com.pi4j.io.pwm.Pwm;
+import io.micronaut.http.annotation.Controller;
+import io.micronaut.http.annotation.Get;
+import jakarta.inject.Named;
+
+//tag::ex[]
+@Controller("/motor")
+public class MotorController {
+    private final MotorHelper MotorHelper;
+
+    public MotorController(@Named("motor") Pwm motor, @Named("pin1") DigitalOutput pin1,
+                           @Named("pin2") DigitalOutput pin2) {
+        this.MotorHelper = new MotorHelper(motor, pin1, pin2);
+    }
+
+    @Get("/enable")
+    public void enableDCMotor() {
+        MotorHelper.enable();
+    }
+
+    @Get("/disable")
+    public void disableDCMotor() {
+        MotorHelper.disable();
+    }
+
+    @Get("/setSpeed/{speed}")
+    public void setSpeed(double speed) {
+        MotorHelper.setSpeed(speed);
+    }
+
+    @Get("/setClockwise/{clockwise}")
+    public void setClockwise(boolean clockwise) {
+        MotorHelper.setClockwise(clockwise);
+    }
+
+    @Get("/switchDirection")
+    public void switchDirection() {
+        MotorHelper.switchDirection();
+    }
+}
+//end::ex[]

components/src/main/resources/application.yml

@@ -35,15 +35,20 @@ pi4j:
       provider: pigpio-pwm
       initial: 0
       shutdown: 0
+    motor:
+      name: Motor
+      address: 18
+      pwmType: SOFTWARE
+      provider: pigpio-pwm
+      initial: 0
+      shutdown: 0
     fan:
       name: FAN
       address: 18
+      pwm-type: SOFTWARE
+      provider: pigpio-pwm
       initial: 0
       shutdown: 0
-      provider: pigpio-pwm
-      pwm-type: hardware
-
-
   # end::pwm[]
 
   # tag::i2c[]

pi4micronaut-utils/src/main/java/com/opensourcewithslu/outputdevices/MotorHelper.java

@@ -0,0 +1,132 @@
+package com.opensourcewithslu.outputdevices;
+
+import com.pi4j.io.gpio.digital.DigitalOutput;
+import com.pi4j.io.pwm.Pwm;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Helper class to control a DC motor using PWM (Pulse Width Modulation).
+ * This class provides methods to enable, disable, and set the speed of a motor.
+ */
+public class MotorHelper {
+
+    private static Logger log = LoggerFactory.getLogger(MotorHelper.class);
+    private static final int FREQUENCY = 50; // Frequency for PWM signal in Hz.
+    private boolean isEnabled = false; // State tracking variable for the motor.
+    private final Pwm motor; // PWM interface for the motor.
+    private final DigitalOutput pin1; // GPIO pin 1 for motor direction.
+    private final DigitalOutput pin2; // GPIO pin 2 for motor direction.
+    private boolean isClockwise = true; // Direction of the motor.
+
+    /**
+     * Constructs a new MotorHelper.
+     *
+     * @param motor A PWM interface to control the motor.
+     * @param pin1 A DigitalOutput interface for the first GPIO pin.
+     * @param pin2 A DigitalOutput interface for the second GPIO pin.
+     */
+    //tag::const[]
+    public MotorHelper(Pwm motor, DigitalOutput pin1, DigitalOutput pin2)
+    //end::const[]
+    {
+        this.motor = motor;
+        this.pin1 = pin1;
+        this.pin2 = pin2;
+    }
+
+    /**
+     * Enables the DC motor by setting an initial duty cycle and frequency.
+     * The motor remains disabled until this method is called.
+     */
+    //tag::[method]
+    public void enable()
+    //end::[method]
+    {
+        log.info("Enabling DC motor");
+        motor.on(0, FREQUENCY); // Initializes PWM signal with 0% duty cycle.
+        isEnabled = true;
+    }
+
+    /**
+     * Disables the motor, effectively stopping any ongoing PWM signal.
+     */
+    //tag::[method]
+    public void disable()
+    //end::[method]
+    {
+        log.info("Disabling DC motor");
+        motor.off(); // Stops the PWM signal.
+        isEnabled = false;
+    }
+
+    /**
+     * Sets the speed of the DC motor.
+     * This method calculates the necessary pulse width and duty cycle to achieve the specified speed.
+     *
+     * @param speed the target speed for the motor, as a percentage between 0 and 1.
+     */
+    //tag::[method]
+    public void setSpeed(double speed)
+    //end::[method]
+    {
+        if (!isEnabled) {
+            log.info("You must enable the DC motor first.");
+            return;
+        }
+
+        if (speed < 0 || speed > 100) {
+            log.info("You must enter a speed between 0 and 100.");
+            return;
+        }
+
+        log.info("Setting motor speed to {}%", speed);
+
+        motor.on(speed, FREQUENCY);
+    }
+
+    /**
+     * Sets the direction of the DC motor.
+     *
+     * @param clockwise whether the motor should rotate clockwise.
+     */
+    //tag::[method]
+    public void setClockwise(boolean clockwise)
+    //end::[method]
+    {
+        if (!isEnabled) {
+            log.info("You must enable the DC motor first.");
+            return;
+        }
+
+        log.info("Setting motor direction clockwise to {}", clockwise);
+        if (clockwise) {
+            pin1.high();
+            pin2.low();
+        } else {
+            pin1.low();
+            pin2.high();
+        }
+
+        isClockwise = clockwise;
+    }
+
+    /**
+     * Switches the direction of the motor.
+     */
+    //tag::[method]
+    public void switchDirection()
+    //end::[method]
+    {
+        setClockwise(!isClockwise);
+    }
+
+    /**
+     * Sets the logger object.
+     *
+     * @param log Logger object to set the logger to.
+     */
+    public void setLog(Logger log) {
+        this.log = log;
+    }
+}

pi4micronaut-utils/src/test/java/com/opensourcewithslu/outputdevices/MotorHelperTest.java

@@ -0,0 +1,135 @@
+package com.opensourcewithslu.outputdevices;
+
+import com.pi4j.io.gpio.digital.DigitalOutput;
+import com.pi4j.io.pwm.Pwm;
+import org.junit.jupiter.api.*;
+import org.slf4j.Logger;
+
+import static org.mockito.Mockito.*;
+
+public class MotorHelperTest {
+    DigitalOutput pin1 = mock(DigitalOutput.class);
+    DigitalOutput pin2 = mock(DigitalOutput.class);
+    Pwm motor = mock(Pwm.class);
+    MotorHelper motorHelper = new MotorHelper(motor, pin1, pin2);
+    Logger log = mock(Logger.class);
+
+    @BeforeEach
+    public void openMocks() {
+        motorHelper.setLog(log);
+    }
+
+    @Test
+    void enables() {
+        motorHelper.enable();
+        verify(motor).on(0, 50);
+        verify(log).info("Enabling DC motor");
+    }
+
+    @Test
+    void disables() {
+        motorHelper.disable();
+        verify(motor).off();
+        verify(log).info("Disabling DC motor");
+    }
+
+    @Test
+    void setSpeedWorksWhenEnabled() {
+        motorHelper.enable();
+        verify(log).info("Enabling DC motor");
+        motorHelper.setSpeed(10);
+        verify(motor).on(10.0d, 50);
+        verify(log).info("Setting motor speed to {}%", 10.0d);
+    }
+
+    @Test
+    void setSpeedFailsWhenDisabled() {
+        motorHelper.setSpeed(10);
+        verify(log).info("You must enable the DC motor first.");
+        verify(motor, never()).on(10.0d, 50);
+        verify(log, never()).info("Setting motor speed to {}%", 10);
+    }
+
+    @Test
+    void setSpeedFailsWhenSpeedIsNegative() {
+        motorHelper.enable();
+        verify(log).info("Enabling DC motor");
+        motorHelper.setSpeed(-10);
+        verify(log).info("You must enter a speed between 0 and 100.");
+        verify(motor, never()).on(-10.0d, 50);
+        verify(log, never()).info("Setting speed to {}%", -10.0d);
+    }
+
+    @Test
+    void setSpeedFailsWhenSpeedIsAbove100() {
+        motorHelper.enable();
+        verify(log).info("Enabling DC motor");
+        motorHelper.setSpeed(110);
+        verify(log).info("You must enter a speed between 0 and 100.");
+        verify(motor, never()).on(110.0d, 50);
+        verify(log, never()).info("Setting motor speed to {}%", 110.0d);
+    }
+
+    @Test
+    void setClockwiseTrueWorksWhenEnabled() {
+        motorHelper.enable();
+        verify(log).info("Enabling DC motor");
+        motorHelper.setClockwise(true);
+        verify(pin1).high();
+        verify(pin2).low();
+        verify(log).info("Setting motor direction clockwise to {}", true);
+    }
+
+    @Test
+    void setClockwiseFalseWorksWhenEnabled() {
+        motorHelper.enable();
+        verify(log).info("Enabling DC motor");
+        motorHelper.setClockwise(false);
+        verify(pin1).low();
+        verify(pin2).high();
+        verify(log).info("Setting motor direction clockwise to {}", false);
+    }
+
+    @Test
+    void setClockwiseFailsWhenDisabled() {
+        motorHelper.setClockwise(true);
+        verify(log).info("You must enable the DC motor first.");
+        verify(pin1, never()).high();
+        verify(pin2, never()).low();
+        verify(log, never()).info("Setting motor direction clockwise to {}", true);
+    }
+
+    @Test
+    void switchDirectionFromClockwiseWorksWhenEnabled() {
+        motorHelper.enable();
+        verify(log).info("Enabling DC motor");
+        motorHelper.setClockwise(true);
+        motorHelper.switchDirection();
+        verify(pin1).low();
+        verify(pin2).high();
+        verify(log).info("Setting motor direction clockwise to {}", false);
+    }
+
+    @Test
+    void switchDirectionToClockwiseWorksWhenEnabled() {
+        motorHelper.enable();
+        verify(log).info("Enabling DC motor");
+        motorHelper.setClockwise(false);
+        motorHelper.switchDirection();
+        verify(pin1).high();
+        verify(pin2).low();
+        verify(log).info("Setting motor direction clockwise to {}", false);
+    }
+
+    @Test
+    void switchDirectionFailsWhenDisabled() {
+        motorHelper.switchDirection();
+        verify(log).info("You must enable the DC motor first.");
+        verify(pin1, never()).high();
+        verify(pin1, never()).low();
+        verify(pin2, never()).high();
+        verify(pin2, never()).low();
+        verify(log, never()).info("Setting motor direction clockwise to {}", true);
+        verify(log, never()).info("Setting motor direction clockwise to {}", false);
+    }
+}