Circuit Documentation

Summary

This circuit is designed to control a Nema 17 stepper motor using an A4988 stepper motor driver. The motor's speed and direction are adjustable via a potentiometer and a toggle switch, respectively. The circuit is powered by a 12V 5A power supply, which is switched on and off using a round rocker switch. The Arduino UNO microcontroller is used to generate the control signals for the A4988 driver based on the inputs from the potentiometer and toggle switch.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Provides I/O pins for interfacing with various components

POWER SUPPLY 12V 5AMP

• Provides a 12V DC output from a 220V AC input
• Powers the circuit including the Arduino UNO and the A4988 driver

Round Rocker Switch

• Acts as an on/off switch for the power supply

A4988 Stepper Motor Driver (Red)

• Drives the stepper motor based on signals from the Arduino UNO
• Configurable micro-stepping resolution

Electrolytic Capacitor

• Stabilizes the voltage supply to the A4988 driver

IEC320 In

• AC power input connector

2Pin Push Switch (x2)

• Momentary push switches used for input control

Toggle Switch

• Changes the direction of the stepper motor

Potentiometer

• Adjusts the speed of the stepper motor

Nema 17 42-STH48

• A stepper motor controlled by the A4988 driver

Wiring Details

Arduino UNO

• Vin connected to the 12V output of the power supply
• GND connected to the ground of the power supply and the A4988 driver
• D3 (stepPin) connected to the STEP pin of the A4988 driver
• D4 (dirPin) connected to the DIR pin of the A4988 driver
• D5 (ms1Pin) connected to the MS1 pin of the A4988 driver
• D6 (ms2Pin) connected to the MS2 pin of the A4988 driver
• D7 (ms3Pin) connected to the MS3 pin of the A4988 driver
• D8 connected to the Gnd pin of the Toggle Switch
• D9 (toggleSwitchL1) connected to the Vcc pin of the Toggle Switch
• D10 (rockerSwitchInput) connected to one of the 2Pin Push Switches
• A0 (potPin) connected to the Output pin of the Potentiometer
• 5V connected to the other 2Pin Push Switch

POWER SUPPLY 12V 5AMP

• 220V Positive Pole (AC) connected to the Input + of the Round Rocker Switch
• 220V Negative Pole (AC) connected to the N of the IEC320 In
• GND (DC) connected to the ground of the circuit
• 12V-24V Output (DC) connected to the Vin of the Arduino UNO and the VMOT of the A4988 driver

Round Rocker Switch

• Input + connected to the 220V Positive Pole (AC) of the power supply
• Ground connected to the GND of the IEC320 In
• Output + connected to the L of the IEC320 In

A4988 Stepper Motor Driver (Red)

• VMOT connected to the 12V output of the power supply
• GND connected to the ground of the power supply and the Arduino UNO
• MS1, MS2, MS3 connected to D5, D6, D7 of the Arduino UNO respectively
• RESET and SLEEP pins are shorted together
• STEP connected to D3 of the Arduino UNO
• DIR connected to D4 of the Arduino UNO
• VDD connected to the VCC pin of the Potentiometer
• 1A, 1B, 2A, 2B connected to the corresponding pins of the Nema 17 stepper motor

Electrolytic Capacitor

• + connected to the VMOT of the A4988 driver
• - connected to the ground of the circuit

IEC320 In

• L connected to the Output + of the Round Rocker Switch
• GND connected to the ground of the circuit
• N connected to the 220V Negative Pole (AC) of the power supply

2Pin Push Switch

• One switch has Input + connected to 5V of the Arduino UNO and Output + connected to the VDD of the A4988 driver
• The other switch has Input + connected to D10 of the Arduino UNO

Toggle Switch

• Vcc connected to D9 of the Arduino UNO
• Sig connected to the ground of the circuit
• Gnd connected to D8 of the Arduino UNO

Potentiometer

• VCC connected to the VDD of the A4988 driver
• Output connected to A0 of the Arduino UNO
• GND connected to the ground of the circuit

Nema 17 42-STH48

• A1 Green and A2 (black) connected to 1B and 1A of the A4988 driver respectively
• B1 Blue and B2 Red connected to 2B and 2A of the A4988 driver respectively

Documented Code

/*
 * Arduino Sketch for Stepper Motor Control
 * This code controls a stepper motor using an A4988 driver.
 * The motor's speed and direction can be controlled via a potentiometer and toggle switch.
 * The rocker switch is used to power the circuit.
 */

// Pin definitions
const int stepPin = 3;
const int dirPin = 4;
const int ms1Pin = 5;
const int ms2Pin = 6;
const int ms3Pin = 7;
const int enablePin = 8;
const int toggleSwitchL1 = 9;
const int rockerSwitchInput = 10;
const int potPin = A0;

void setup() {
  // Set pin modes
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  pinMode(ms1Pin, OUTPUT);
  pinMode(ms2Pin, OUTPUT);
  pinMode(ms3Pin, OUTPUT);
  pinMode(enablePin, OUTPUT);
  pinMode(toggleSwitchL1, INPUT);
  pinMode(rockerSwitchInput, INPUT);
  pinMode(potPin, INPUT);

  // Initialize pins
  digitalWrite(enablePin, LOW); // Enable the driver
  digitalWrite(ms1Pin, LOW); // Full step mode
  digitalWrite(ms2Pin, LOW); // Full step mode
  digitalWrite(ms3Pin, LOW); // Full step mode
}

void loop() {
  // Read the potentiometer value
  int potValue = analogRead(potPin);
  // Map the potentiometer value to a delay time
  int delayTime = map(potValue, 0, 1023, 1000, 200);

  // Read the toggle switch state
  int toggleState = digitalRead(toggleSwitchL1);
  // Set the direction based on the toggle switch state
  digitalWrite(dirPin, toggleState);

  // Step the motor
  digitalWrite(stepPin, HIGH);
  delayMicroseconds(delayTime);
  digitalWrite(stepPin, LOW);
  delayMicroseconds(delayTime);
}

This code is designed to run on an Arduino UNO and controls the A4988 stepper motor driver to operate the stepper motor. The speed of the motor is determined by the value read from the potentiometer, and the direction is controlled by the state of the toggle switch. The code sets up the necessary pins as inputs or outputs and initializes the driver in full step mode. The main loop reads the potentiometer value, maps it to a delay time, reads the toggle switch state to set the direction, and then steps the motor accordingly.