Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller, a ULN2003A breakout board, an Adafruit Gear-Reduced Stepper Motor, and three LEDs (red, green, and yellow) each connected through a 200 Ohm resistor. The Arduino UNO controls the LEDs and the stepper motor via the ULN2003A breakout board.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

Adafruit Gear-Reduced Stepper Motor (small)

• Description: A small stepper motor with gear reduction for increased torque.
• Pins: RED, ORANGE, YELLOW, PINK, BLUE

ULN2003A Breakout Board

• Description: A Darlington transistor array used to drive the stepper motor.
• Pins: In 1, In 2, In 3, In 4, In 5, In 6, In 7, 0V, +5V, ON/OFF jumper switch, BLUE wire, PINK wire, YELLOW wire, ORANGE wire, RED wire

LED: Two Pin (red)

• Description: A red LED.
• Pins: cathode, anode

LED: Two Pin (green)

• Description: A green LED.
• Pins: cathode, anode

LED: Two Pin (yellow)

• Description: A yellow LED.
• Pins: cathode, anode

Resistor (200 Ohms)

• Description: A resistor with a resistance of 200 Ohms.
• Pins: pin1, pin2

Wiring Details

Arduino UNO

• GND connected to:

  • Cathode of yellow LED
  • Cathode of green LED
  • Cathode of red LED
  • 0V of ULN2003A breakout board

• 5V connected to:

  • +5V of ULN2003A breakout board

• D5 connected to:

  • pin2 of a 200 Ohm resistor (connected to the anode of the yellow LED)

• D6 connected to:

  • pin2 of a 200 Ohm resistor (connected to the anode of the green LED)

• D7 connected to:

  • pin2 of a 200 Ohm resistor (connected to the anode of the red LED)

• D8 connected to:

  • In 1 of ULN2003A breakout board

• D9 connected to:

  • In 2 of ULN2003A breakout board

• D10 connected to:

  • In 3 of ULN2003A breakout board

• D11 connected to:

  • In 4 of ULN2003A breakout board

Adafruit Gear-Reduced Stepper Motor (small)

• RED connected to:

  • BLUE wire of ULN2003A breakout board

• ORANGE connected to:

  • PINK wire of ULN2003A breakout board

• YELLOW connected to:

  • YELLOW wire of ULN2003A breakout board

• PINK connected to:

  • ORANGE wire of ULN2003A breakout board

• BLUE connected to:

  • RED wire of ULN2003A breakout board

ULN2003A Breakout Board

• 0V connected to:

  • GND of Arduino UNO

• +5V connected to:

  • 5V of Arduino UNO

• In 1 connected to:

  • D8 of Arduino UNO

• In 2 connected to:

  • D9 of Arduino UNO

• In 3 connected to:

  • D10 of Arduino UNO

• In 4 connected to:

  • D11 of Arduino UNO

• BLUE wire connected to:

  • RED of stepper motor

• PINK wire connected to:

  • ORANGE of stepper motor

• YELLOW wire connected to:

  • YELLOW of stepper motor

• ORANGE wire connected to:

  • PINK of stepper motor

• RED wire connected to:

  • BLUE of stepper motor

LED: Two Pin (red)

• cathode connected to:

  • GND of Arduino UNO

• anode connected to:

  • pin1 of a 200 Ohm resistor (connected to D7 of Arduino UNO)

LED: Two Pin (green)

• cathode connected to:

  • GND of Arduino UNO

• anode connected to:

  • pin1 of a 200 Ohm resistor (connected to D6 of Arduino UNO)

LED: Two Pin (yellow)

• cathode connected to:

  • GND of Arduino UNO

• anode connected to:

  • pin1 of a 200 Ohm resistor (connected to D5 of Arduino UNO)

Resistor (200 Ohms)

• pin1 connected to:

  • Anode of the corresponding LED

• pin2 connected to:

  • D5, D6, or D7 of Arduino UNO (depending on the LED)

Documented Code

Arduino UNO Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

This code is a basic template for the Arduino UNO. The setup() function is where you initialize your components, and the loop() function is where you place the code that needs to run continuously.