Circuit Documentation

Summary

This circuit is designed to control a 28BYJ-48 Stepper Motor using an Arduino UNO as the microcontroller and a ULN2003 driver board. The Arduino UNO interfaces with the ULN2003 to drive the stepper motor in response to inputs from a Morse Switch. The power jack provides the necessary power to the circuit, and the USB male 2-pin connection is likely used for power or data transfer.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P.
• It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

28BYJ-48 Stepper Motor

• A small, 5V geared stepping motor with a 1/64 reduction gear ratio.
• It has 5 wires for connecting to the driver board.

ULN2003

• A 7-channel Darlington array which is used to interface between low-level logic signals and higher-power loads.
• This IC is commonly used to drive relays, lamps, and stepper motors.

Power Jack

• A connector for supplying power to the circuit.
• It typically has a positive and a negative terminal.

USB Male 2 Pin Connection

• A USB connector that can be used for power supply or data transfer.
• It has two pins: positive and negative.

Morse Switch

• A switch that can be used to input Morse code or as a simple on/off switch.
• It has two terminals: live and switch.

Wiring Details

Arduino UNO

• GND connected to the GND of the power jack and the GND of the ULN2003.
• D11 connected to IN4 of the ULN2003.
• D10 connected to IN3 of the ULN2003.
• D9 connected to IN2 of the ULN2003.
• D8 connected to IN1 of the ULN2003.
• D2 connected to the Live terminal of the Morse Switch.

28BYJ-48 Stepper Motor

• BLUE connected to COIL1 of the ULN2003.
• PINK connected to COIL2 of the ULN2003.
• YELLOW connected to COIL3 of the ULN2003.
• ORANGE connected to COIL4 of the ULN2003.
• RED connected to COIL5 of the ULN2003.

ULN2003

• IN1 - IN4 connected to D8 - D11 of the Arduino UNO respectively.
• GND connected to the GND of the Arduino UNO.
• + connected to the POSITIF terminal of the power jack.
• COIL1 - COIL4 connected to the corresponding wires of the 28BYJ-48 Stepper Motor.

Power Jack

• NEGATIF connected to the GND of the Arduino UNO and the GND of the ULN2003.
• POSITIF connected to the + of the ULN2003.

Morse Switch

• Live connected to D2 of the Arduino UNO.
• Switch connected to GND of the Arduino UNO.

Documented Code

Arduino UNO Code (sketch.ino)

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

}

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

}

Note: The provided code is a template and does not contain any functionality. It needs to be filled in with the logic to control the stepper motor and read inputs from the Morse Switch.