PQ12_pot.ino

/*
   Actuonix PQ12 Micro Linear actuator with Arduino
   https://www.robotshop.com/en/firgelli-technologies-pq12-actuator-12v-pot.html
   H-Bridge(L293NE) / 12v power supply
   potentiometer (P+->5V / P->A0 / P-->GND)
   M+, M- -> motor pins
   ~D9 : Enable pin (control speed)
   D10,11 : motor control pins

   by Hayeon Hwang (03/04/2018)
*/

int speedPin = 9; // H-bridge enable pin for speed control
int motor1APin = 10; // H-bridge leg 1
int motor2APin = 11; // H-bridge leg 2
int ledPin = 13; // status LED

int positionfeed = 0;
int speed_value; // value for motor speed
int targetpos = 600;

void setup() {

  // set digital i/o pins as outputs:
  pinMode(speedPin, OUTPUT);
  pinMode(motor1APin, OUTPUT);
  pinMode(motor2APin, OUTPUT);
  pinMode(ledPin, OUTPUT);

  digitalWrite(speedPin, HIGH);
  Serial.begin(9600);
}

void loop() {

  positionfeed = analogRead(A0);
  //  Serial.println(positionfeed);
  int error = targetpos - positionfeed;
  digitalWrite(ledPin, HIGH); // status LED is always on

  //  if (positionfeed > 900) {
  //     digitalWrite(motor1APin, LOW);  // set leg 1 of the H-bridge high
  //     digitalWrite(motor2APin, HIGH);
  //  } else if (positionfeed < 50){
  //    digitalWrite(motor1APin, HIGH);  // set leg 1 of the H-bridge high
  //    digitalWrite(motor2APin, LOW);
  //  }

  Serial.println(error);
  if (error < -5) {
    digitalWrite(motor1APin, LOW);  // set leg 1 of the H-bridge high
    digitalWrite(motor2APin, HIGH);
  } else if (error > targetpos - 50) {
    digitalWrite(motor1APin, HIGH);  // set leg 1 of the H-bridge high
    digitalWrite(motor2APin, LOW);
  }

  speed_value_motor1 = 100; // half speed
  analogWrite(speedPin, speed_value); // output speed as

}