Метка: stepper motor

This is a motorized rotating table designed for displaying models, small products, or for photography setups. The table rotates automatically at one of four selectable speeds, controlled by an Arduino and a button. It’s compact, quiet, and fully 3D-printable.

🛠️ Features

• 180mm rotating platform
• 4 speed levels (adjustable by button press)
• Power switch to turn the system on/off
• Smooth rotation using stepper motor and bearings
• Clean electronics enclosure
• Fully 3D printable design

📦 Required Components

Item	Quantity	Notes	Link
Arduino Uno	1	Any compatible clone will work	https://sl.aliexpress.ru/p?key=tkvx3Sm
Stepper Motor 28BYJ-48 (5V)	1	With 5-wire connector	https://sl.aliexpress.ru/p?key=rjvx3Cq
ULN2003 Driver Board	1	Usually comes with the motor	https://sl.aliexpress.ru/p?key=rjvx3Cq
6803 Bearings	3	For smooth platform support	https://sl.aliexpress.ru/p?key=Jwax3Qh
M3x8mm bolts	2	For mounting the stepper motor	https://sl.aliexpress.ru/p?key=MOax3Cy
M4x12mm bolts	3	For securing the bearings	https://sl.aliexpress.ru/p?key=MOax3Cy
M4 nuts	3	For the M4 bolts	https://sl.aliexpress.ru/p?key=JGax3LO
Toggle switch KCD11 (14.9 × 9.9 mm)	1	Fits the panel slot	https://sl.aliexpress.ru/p?key=Lsax3JX
Jumper Wires (Male–Female)	1 set	For connecting components	https://sl.aliexpress.ru/p?key=53ax3R0
5V 2A Power Adapter	1	External power is highly recommended	https://sl.aliexpress.ru/p?key=Diax3qd

⚙️ Electronics & Functionality

• When the power switch is turned on, the table starts rotating at the first speed.
• Pressing the button cycles through 4 pre-set speeds.
• After the 4th speed, the next button press resets it back to the first.
• The rotating top is mounted directly on the motor shaft and rests on three 6803 bearings, ensuring stable and low-friction rotation.

🧰 Assembly Instructions

1. Insert the Arduino Uno and ULN2003 driver
   Place both boards into their dedicated slots inside the printed base. Make sure they sit securely.
2. Mount the stepper motor
   Insert the 28BYJ-48 motor onto the positioning pins in the center of the base, so that the shaft is aligned perfectly in the middle.
3. Install M4 nuts into the bearing holders
   Press the M4 nuts into the hexagonal cutouts of the bearing brackets. Then attach the brackets to the side walls using the M4x12mm bolts.
4. Place the bearings
   Slide the three 6803 bearings onto their holders. These will support the rotating platform smoothly.
5. Mount the button and power switch
   Insert the momentary button and the KCD11 toggle switch into their designated panel slots.
6. Assemble and solder the electronics
   Connect the motor, driver, Arduino, button, and switch using jumper wires. Solder the power lines securely and connect to a 5V 2A external power adapter.

🔌 Wiring Diagram (Text Version)

🧠 ULN2003 Driver → Arduino Uno

ULN2003 Pin	Arduino Pin
IN1	D8
IN2	D9
IN3	D10
IN4	D11
VCC	5V
GND	GND

🔸 The stepper motor connects directly to the ULN2003 via the 5-pin header.

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🔘 Momentary Button

Button Pin	Connection
One contact	GND
Other contact	Arduino D2

• Use pinMode(D2, INPUT_PULLUP); in your code.
• When pressed, the button pulls the pin LOW.

Toggle Switch (SPDT or SPST)

Switch Pin	Connection
COM (middle pin)	GND
One side pin	Arduino D3

• Use pinMode(D3, INPUT_PULLUP); in your code.
• The switch will pull D3 LOW when ON (closed).

🧠 Arduino code

#include <Stepper.h>

const int stepsPerRevolution = 2048;
Stepper myStepper(stepsPerRevolution, 8, 10, 9, 11);

const int buttonPin = 2;
const int switchPin = 3;

const int numSpeeds = 4;
int speedSteps[numSpeeds] = {1, 3, 5, 8};
int currentSpeedIndex = 0;

bool lastButtonState = HIGH;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(switchPin, INPUT_PULLUP);
  myStepper.setSpeed(speedSteps[currentSpeedIndex]);
}

void loop() {
  if (digitalRead(switchPin) == LOW) {
    bool buttonState = digitalRead(buttonPin);

    if (lastButtonState == HIGH && buttonState == LOW) {
      currentSpeedIndex = (currentSpeedIndex + 1) % numSpeeds;
      myStepper.setSpeed(speedSteps[currentSpeedIndex]);

      Serial.print("Скорость изменена: ");
      Serial.println(speedSteps[currentSpeedIndex]);
    }
    lastButtonState = buttonState;

    myStepper.step(1);
  } else {
    delay(100);
  }
}