Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with various components including a stepper motor, a stepper motor driver, a rotary potentiometer, a pushbutton, resistors, an LCD display, a multi-coin acceptor, and a 4×4 keypad. The Arduino UNO controls the stepper motor via the A4988 stepper motor driver and displays information on the LCD. The rotary potentiometer and pushbutton provide user input, while the multi-coin acceptor and keypad handle coin input and user commands respectively.

Component List

Stepper Motor (Bipolar)

• Description: A bipolar stepper motor with four pins for controlling the motor coils.
• Pins: D, B, C, A

A4988 Stepper Motor Driver Carrier

• Description: A driver carrier for controlling a bipolar stepper motor.
• Pins: ENABLE, MS1, MS2, MS3, RESET, SLEEP, STEP, DIR, GND, VCC, 1B, 1A, 2A, 2B, VMOT

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

Rotary Potentiometer

• Description: A variable resistor used to adjust voltage levels.
• Pins: leg1, wiper, leg2
• Properties: Resistance: 10k Ohms

Resistor (220 Ohms)

• Description: A resistor with a resistance of 220 Ohms.
• Pins: pin1, pin2
• Properties: Resistance: 220 Ohms

Resistor (10k Ohms)

• Description: A resistor with a resistance of 10k Ohms.
• Pins: pin1, pin2
• Properties: Resistance: 10k Ohms

Pushbutton

• Description: A simple pushbutton switch.
• Pins: Pin 3 (out), Pin 4 (out), Pin 1 (in), Pin 2 (in)

16X2 LCD

• Description: A 16x2 character LCD display.
• Pins: VSS, VDD, V0, RS, RW, E, D1, D0, D2, D3, D4, D6, D5, D7, A, K

Multi Coin Acceptor

• Description: A device that accepts multiple types of coins.
• Pins: COIN, DC12V, GND, COUNTER

4×4 Keypad

• Description: A keypad with 4 rows and 4 columns.
• Pins: C3, C2, C4, C1, R1, R2, R3, R4

Wiring Details

Stepper Motor (Bipolar)

• D connected to 1B of A4988 Stepper Motor Driver Carrier
• B connected to 1A of A4988 Stepper Motor Driver Carrier
• C connected to 2A of A4988 Stepper Motor Driver Carrier
• A connected to 2B of A4988 Stepper Motor Driver Carrier

A4988 Stepper Motor Driver Carrier

• VCC connected to 5V of Arduino UNO
• GND connected to GND of Arduino UNO
• MS1 connected to 5V of Arduino UNO
• MS2 connected to 5V of Arduino UNO
• MS3 connected to GND of Arduino UNO
• ENABLE connected to GND of Arduino UNO
• RESET connected to SLEEP of A4988 Stepper Motor Driver Carrier
• STEP connected to D3 of Arduino UNO
• DIR connected to D2 of Arduino UNO
• 1B connected to D of Stepper Motor (Bipolar)
• 1A connected to B of Stepper Motor (Bipolar)
• 2A connected to C of Stepper Motor (Bipolar)
• 2B connected to A of Stepper Motor (Bipolar)

Arduino UNO

• 5V connected to VCC of A4988 Stepper Motor Driver Carrier
• GND connected to GND of A4988 Stepper Motor Driver Carrier
• D3 connected to STEP of A4988 Stepper Motor Driver Carrier
• D2 connected to DIR of A4988 Stepper Motor Driver Carrier
• D6 connected to R1 of 4×4 Keypad
• D12 connected to RS of 16X2 LCD
• D13 connected to E of 16X2 LCD
• D11 connected to D4 of 16X2 LCD
• D9 connected to D6 of 16X2 LCD
• D10 connected to D5 of 16X2 LCD
• D8 connected to D7 of 16X2 LCD
• D7 connected to R2 of 4×4 Keypad
• D5 connected to C1 of 4×4 Keypad
• D4 connected to C2 of 4×4 Keypad
• D1 connected to C3 of 4×4 Keypad

Rotary Potentiometer

• leg2 connected to pin2 of Resistor (220 Ohms)
• leg2 connected to pin2 of Resistor (10k Ohms)
• leg2 connected to VCC of A4988 Stepper Motor Driver Carrier
• leg2 connected to 5V of Arduino UNO
• wiper connected to V0 of 16X2 LCD
• leg1 connected to Pin 2 (in) of Pushbutton
• leg1 connected to GND of A4988 Stepper Motor Driver Carrier
• leg1 connected to MS3 of A4988 Stepper Motor Driver Carrier
• leg1 connected to ENABLE of A4988 Stepper Motor Driver Carrier
• leg1 connected to GND of Multi Coin Acceptor
• leg1 connected to K of 16X2 LCD
• leg1 connected to RW of 16X2 LCD
• leg1 connected to VDD of 16X2 LCD
• leg1 connected to VSS of 16X2 LCD
• leg1 connected to GND of Arduino UNO

Resistor (220 Ohms)

• pin1 connected to A of 16X2 LCD

Resistor (10k Ohms)

• pin1 connected to Pin 4 (out) of Pushbutton

Pushbutton

• Pin 1 (in) connected to R1 of 4×4 Keypad
• Pin 1 (in) connected to D6 of Arduino UNO
• Pin 2 (in) connected to leg1 of Rotary Potentiometer
• Pin 4 (out) connected to pin1 of Resistor (10k Ohms)

16X2 LCD

• V0 connected to wiper of Rotary Potentiometer
• RS connected to D12 of Arduino UNO
• E connected to D13 of Arduino UNO
• D4 connected to D11 of Arduino UNO
• D6 connected to D9 of Arduino UNO
• D5 connected to D10 of Arduino UNO
• D7 connected to D8 of Arduino UNO
• A connected to pin1 of Resistor (220 Ohms)
• K connected to leg1 of Rotary Potentiometer
• RW connected to leg1 of Rotary Potentiometer
• VDD connected to leg1 of Rotary Potentiometer
• VSS connected to leg1 of Rotary Potentiometer

Multi Coin Acceptor

• GND connected to leg1 of Rotary Potentiometer
• COIN connected to C1 of 4×4 Keypad
• **CO