A latching trigger

Projects Programming
3

Thanks for replying. I have included my code which is the buttons working on their own, it doesn't have the LDR part in it as with this code I have never managed to make it work properly, but this is the code I want to add it too. I tired using the same idea as the buttons when I did try to make it work. PWA is the pulse width modulation pin for the motor (Motor A on the arduino motor shield). The set button is so I can set the encoder position so I can adjust the blinds without having to take the hardware apart to adjust its start point.

#define UPbutton 5
#define DOWNbutton 6
#define SETbutton 7
#define PWA 3
#define DIRA 12

int up = 0;

int old_up = 0;

int down = 0;

int old_down = 0;

int set = 0;

int state = 0;

//encoder
const int encoderPinA = 4;
const int encoderPinB = 2;
const int encoderStepsPerRevolution=200;
int angle = 0;

int val;

int encoderPos = 0;
boolean encoderALast = LOW;  // remembers the previous pin state
//encoder end

void setup()
{
  pinMode(UPbutton, INPUT);
  pinMode(DOWNbutton, INPUT);
  pinMode(SETbutton, INPUT);
  pinMode(PWA, OUTPUT);
  pinMode(DIRA, OUTPUT);
  
  //encoder
  pinMode(encoderPinA, INPUT);
  pinMode(encoderPinB, INPUT);
  digitalWrite(encoderPinA, HIGH);
 digitalWrite(encoderPinB, HIGH);
  Serial.begin (9600);
  //encoder end
}

void loop()
{
  up = digitalRead(UPbutton);
  down = digitalRead(DOWNbutton);
  set = digitalRead(SETbutton);
  
  if((up == HIGH) && (old_up == LOW))
  {
    state = 1 - state;
    delay(10);
  }
  
  if((down == HIGH) && (old_down == LOW))
  {
    state = 2 - state;
    delay(10);
  }
  
  old_up = up;
  old_down = down;
  
  if(state == 0)
  {
    digitalWrite(DIRA, LOW);
 analogWrite(PWA, 0);
  }
  
  //state 1 is upward motion
  
  if(state == 1)
 {
     digitalWrite(DIRA, HIGH);
 analogWrite(PWA, 255);
 }
  
  //state 2 is downward motion
  
  if(state == 2)
 {
     digitalWrite(DIRA, LOW);
 analogWrite(PWA, 255);
 }
 
 //autostop bit
 
 if((encoderPos < 10) && (state == 1 ))
 {
  state = 0; 
 }
 
 if((encoderPos > 600) && (state == 2))
 {
   state = 0;
 }
 
 //autostop bit end
 
 //encoder
 boolean encoderA = digitalRead(encoderPinA);

if ((encoderALast == HIGH) && (encoderA == LOW))
  {
    if (digitalRead(encoderPinB) == LOW)
    {
      encoderPos++;
    }
    else
    {
      encoderPos--;
    }
    angle=encoderPos;
    
    Serial.print (state); //only new bit
    Serial.print (encoderPos);
    Serial.print (" ");
    Serial.println (angle);
  }

  encoderALast = encoderA;
  //encoder end
 
 if(set == HIGH)
 {
   encoderPos = 20;
 }
 
}