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Skill_IV_ Eunice's Motor

Made by yuany4

Created: November 14th, 2024

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Intention

The goal of this project was to control a servo motor using a Particle device and a push button The project includes the ability to control the servo position manually through the Particle console, providing flexibility in real-time testing and operation.

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Process

The servo was connected to the Particle device’s A1 pin for motor control and a button to D3 serving as on/off. And I coded to connect the board with particle function, so I can either turn on the motor through pressing the button, or call the servo function on particle console. 

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Outcome

    •  The servo responded to both the button and manual commands from the Particle console as expected. When the button was pressed, the servo moved to 90 degrees, and upon release, it returned to 0 degrees. The manual control allowed for flexible testing, confirming that the servo could smoothly move to any specified position between 0 and 180 degrees.

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Reflection

I would like to make the motor run as fast as a fan next time 

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int servoPin = A1;         // Servo control pin
int buttonPin = D3;        // Button input pin
int servoPos = 0;          // Initial servo position
bool buttonPressed = false;

void setup() {
    // Set servoPin as output and buttonPin as input
    pinMode(servoPin, OUTPUT);
    pinMode(buttonPin, INPUT);

    // Register Particle functions and variables
    Particle.function("servo", servoControl);
    Particle.variable("servoPos", &servoPos, INT);
}

void loop() {
    // Check if the button is pressed
    if (digitalRead(buttonPin) == HIGH) {
        if (!buttonPressed) {
            // Set servo to 90 degrees when button is pressed
            setServoAngle(90);
            buttonPressed = true;
            delay(500);  // Debounce delay
        }
    } else {
        if (buttonPressed) {
            // Reset servo to 0 degrees when button is released
            setServoAngle(0);
            buttonPressed = false;
        }
    }
}

int servoControl(String command) {
    // Convert command to integer and constrain it between 0 and 180
    int newPos = command.toInt();
    servoPos = constrain(newPos, 0, 180);

    // Set the servo to the new position
    setServoAngle(servoPos);

    return 1;  // Return success
}

// Function to set the servo angle using PWM
void setServoAngle(int angle) {
    // Convert angle (0 to 180) to pulse width (500 to 2500 microseconds)
    int pulseWidth = map(angle, 0, 180, 500, 2500);
    
    // Create a 20ms period PWM signal with the required pulse width
    for (int i = 0; i < 50; i++) {  // 50 cycles of 20ms for stability
        digitalWrite(servoPin, HIGH);
        delayMicroseconds(pulseWidth);
        digitalWrite(servoPin, LOW);
        delay(20 - pulseWidth / 1000);  // Complete the 20ms period
    }
}
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