Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with various components including a stepper motor, a buzzer, an LCD display, a keypad, an RTC module, a stepper motor driver, and a 12V power supply. The Arduino UNO serves as the central controller, managing the operations of the connected components.

Component List

Stepper Motor (Bipolar)

• Description: A bipolar stepper motor used for precise control of rotational position.
• Pins: D, B, C, A

Buzzer

• Description: An audio signaling device.
• Pins: PIN, GND

LCD 20x4 I2C

• Description: A 20x4 character LCD display with I2C interface.
• Pins: GND, 5V, SCA, SCL

4x4 Keypad (Simulator)

• Description: A 4x4 matrix keypad used for user input.
• Pins: R1, C4, R2, C2, R3, R4, C1, C3

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

RTC DS3231

• Description: A real-time clock module.
• Pins: 32K, SQW, SCL, SDA, VCC, GND

DRV 8825

• Description: A stepper motor driver.
• Pins: EN, M0, M1, M2, RST, SLP, STEP, DIR, VMOT, GND MOTOR, B2, B1, A1, A2, FAULT, GND LOGIC

12V Power Supply

• Description: A power supply providing 12V DC.
• Pins: +, -

Wiring Details

Stepper Motor (Bipolar)

• Pin D connected to DRV 8825 B1
• Pin B connected to DRV 8825 B2
• Pin C connected to DRV 8825 A2
• Pin A connected to DRV 8825 A1

Buzzer

• Pin PIN connected to Arduino UNO D13
• Pin GND connected to Arduino UNO GND

LCD 20x4 I2C

• Pin GND connected to RTC DS3231 GND and Arduino UNO GND
• Pin 5V connected to RTC DS3231 VCC, DRV 8825 RST, DRV 8825 SLP, and Arduino UNO 5V
• Pin SCA connected to RTC DS3231 SDA and Arduino UNO A4
• Pin SCL connected to RTC DS3231 SCL and Arduino UNO A5

4x4 Keypad (Simulator)

• Pin R1 connected to Arduino UNO D5
• Pin C4 connected to Arduino UNO D12
• Pin R2 connected to Arduino UNO D6
• Pin C2 connected to Arduino UNO D10
• Pin R3 connected to Arduino UNO D7
• Pin R4 connected to Arduino UNO D8
• Pin C1 connected to Arduino UNO D9
• Pin C3 connected to Arduino UNO D11

Arduino UNO

• GND connected to RTC DS3231 GND, LCD 20x4 I2C GND, DRV 8825 GND LOGIC, and Buzzer GND
• 5V connected to RTC DS3231 VCC, LCD 20x4 I2C 5V, DRV 8825 RST, and DRV 8825 SLP
• A4 connected to RTC DS3231 SDA and LCD 20x4 I2C SCA
• A5 connected to RTC DS3231 SCL and LCD 20x4 I2C SCL
• D3 connected to DRV 8825 STEP
• D4 connected to DRV 8825 DIR

RTC DS3231

• Pin GND connected to LCD 20x4 I2C GND and Arduino UNO GND
• Pin VCC connected to LCD 20x4 I2C 5V, DRV 8825 RST, DRV 8825 SLP, and Arduino UNO 5V
• Pin SDA connected to LCD 20x4 I2C SCA and Arduino UNO A4
• Pin SCL connected to LCD 20x4 I2C SCL and Arduino UNO A5

DRV 8825

• Pin EN connected to M0, M1, M2, and GND LOGIC
• Pin DIR connected to Arduino UNO D4
• Pin STEP connected to Arduino UNO D3
• Pin VMOT connected to 12V Power Supply +
• Pin GND MOTOR connected to 12V Power Supply -

12V Power Supply

• Pin + connected to DRV 8825 VMOT
• Pin - connected to DRV 8825 GND MOTOR

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:

}

Additional Documentation (documentation.txt)