Example Code for Arduino-Motor Speed and Direction Control

Hardware Preparation

• UNO x1
• Motor x1

Software Preparation

• Arduino IDE V1.6.5 Click to Download Arduino IDE

Wiring Diagram

	NOTE: Remember to connect Arduino GND to the POWER-.

Other Preparation Work

1. Open the Arduino IDE and copy the following code to the IDE. Select your board's serial port and the board type (e.g. Arduino UNO) and upload the sample code.
2. Open the Serial monitor.
3. Enter a number between 0 and 255 to set the motor's speed. (0: Maxmum speed; 255: Stop)

• The code will alternates its rotation direction every 5 seconds.

Sample Code

int i = 0;
unsigned long time = 0;
bool flag = HIGH;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(10, OUTPUT); //direction control PIN 10 with direction wire 
  pinMode(11, OUTPUT); //PWM PIN 11  with PWM wire
}

void loop() {
  // put your main code here, to run repeatedly:
  if (millis() - time > 5000)  {
    flag = !flag;
    digitalWrite(10, flag);
    time = millis();
  }
  if (Serial.available())  {
    analogWrite(11, Serial.parseInt());  //input speed (must be int)
    delay(200);
  }
  for(int j = 0;j<8;j++)  {
    i += pulseIn(9, HIGH, 500000); //SIGNAL OUTPUT PIN 9 with  white line,cycle = 2*i,1s = 1000000us，Signal cycle pulse number：27*2
  }
  i = i >> 3;
  Serial.print(111111 / i); //speed   r/min  (60*1000000/(45*6*2*i))
  Serial.println("  r/min");
  i = 0;
}

Result