Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller controlling a Bipolar Stepper Motor (NEMA 17). The Arduino UNO is programmed to drive the stepper motor using a half-stepping technique. The connections between the Arduino and the stepper motor are established through digital pins D8, D9, D10, and D11.

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

Bipolar Stepper Motor (NEMA 17)

• Description: A type of stepper motor with two coils (A and B) and four wires.
• Pins: A-, A+, B+, B-

Wiring Details

Arduino UNO

• D11: Connected to A- of Bipolar Stepper Motor (NEMA 17)
• D10: Connected to A+ of Bipolar Stepper Motor (NEMA 17)
• D9: Connected to B+ of Bipolar Stepper Motor (NEMA 17)
• D8: Connected to B- of Bipolar Stepper Motor (NEMA 17)

Bipolar Stepper Motor (NEMA 17)

• A-: Connected to D11 of Arduino UNO
• A+: Connected to D10 of Arduino UNO
• B+: Connected to D9 of Arduino UNO
• B-: Connected to D8 of Arduino UNO

Code Documentation

Arduino UNO Code

/*---------------------------------------*\
| Half-stepping drive of Bipolar Stepper  |
\*---------------------------------------*/

// pins connected
#define Ap 10  // A+ line
#define Am 11  // A- line
#define Bp 9   //  .
#define Bm 8   //  .

void setup() {
  // set output
  pinMode(Ap, OUTPUT);
  pinMode(Am, OUTPUT);
  pinMode(Bp, OUTPUT);
  pinMode(Bm, OUTPUT);
}

int I = 0;
void loop() {
  // This is Half-step motion
  if (I++ < 50) {  // stop after 50*8 steps (=400) - one full turn with gearRatio "2:1"
    delay(10);
    digitalWrite(Bm, LOW); digitalWrite(Ap, HIGH);  // Step 1
    delay(10);
    digitalWrite(Ap, HIGH); digitalWrite(Bp, HIGH);  // Step 2
    delay(10);
    digitalWrite(Ap, LOW); digitalWrite(Bp, HIGH);  // Step 3
    delay(10);
    digitalWrite(Bp, HIGH); digitalWrite(Am, HIGH);  // Step 4
    delay(10);
    digitalWrite(Bp, LOW); digitalWrite(Am, HIGH);  // Step 5
    delay(10);
    digitalWrite(Am, HIGH); digitalWrite(Bm, HIGH);  // Step 6
    delay(10);
    digitalWrite(Am, LOW); digitalWrite(Bm, HIGH);  // Step 7
    delay(10);
    digitalWrite(Bm, HIGH); digitalWrite(Ap, HIGH);  // Step 8
  } else while (1);
}

This code sets up the Arduino UNO to control the Bipolar Stepper Motor (NEMA 17) using a half-stepping technique. The motor will make one full turn with a gear ratio of 2:1, stopping after 400 steps.