Rotary encoder bezel for wearables

#include <TFT_eSPI.h>//import graphics library


int lastState1; //last state of hall effect sensor 1
int lastState2; //last state of hall effect sensor 2
int lastState3; //last state of hall effect sensor 3
int state1;//current state of hall effect sensor 1
int state2;//current state of hall effect sensor 2
int state3;//current state of hall effect sensor 3
int count;//current incrementation count

#define ms1 19 //hall effect sensor pins
#define ms2 17
#define ms3 16
//graphics are all based around the defined centre of the screen
#define centrey 120 
#define centrex 120

//declare display object
TFT_eSPI tft;


void setup() {
  tft.begin();//start display
  tft.fillScreen(TFT_BLACK);//flush display
 
//hall effect sensors im using are active low
pinMode(ms1, INPUT_PULLUP);
pinMode(ms2, INPUT_PULLUP);
pinMode(ms3, INPUT_PULLUP);

//Display initial graphical indicators
tft.setTextSize(2);
tft.setCursor(centrex-20,
centrey-40);
tft.print("HES2");
tft.setCursor(centrex-80,
centrey-40);
tft.print("HES1");
tft.setCursor(centrex+40,
centrey-40);
tft.print("HES3");
tft.fillRect(centrex-20,
centrey-20,50,20,TFT_RED);//
set the indicators to red
tft.fillRect(centrex-80,
centrey-20,50,20,TFT_RED);
tft.fillRect(centrex+40,
centrey-20,50,20,TFT_RED);
tft.fillRect(centrex-20,
centrey+10,50,20,TFT_RED);
tft.fillRect(centrex-80,
centrey+10,50,20,TFT_RED);
tft.fillRect(centrex+40,
centrey+10,50,20,TFT_RED);
}

void loop() {
 
state1 = digitalRead(ms1)  ;//read the state of the hall effect sensor
state2 = digitalRead(ms2)  ;
state3 = digitalRead(ms3)  ;


drawIndicators();//draw the graphical indicatosr for the statre of the hall effect sensors
check();//check if the state of the sensors have changed and apply the changes to the count variable

if(count>=24){//reset the count back to 0 when it reaches the end
  count = 0;
}
if(count<=-1){
  count = 23;
}

//print the count
tft.setCursor(centrex,centrey+
50);
tft.setTextColor(TFT_WHITE,
TFT_BLACK);
tft.fillRect(centrex,centrey+
50,50,20,TFT_BLACK);
tft.print(count);

drawSelector(15 * count, 100, 5);//draw the white dot around the outside to show the count visually
clearSelector(15 * count, 100, 5, 15); //clear the dots
}

/*Function to draw graphical indicator in a circle
-angle refers to the desired position around the circle (degrees)
-radius refers to how far out from the centre it should be drawn
-iconRadius refers to how large the circular indicator should be
*/

void drawSelector(int angle, int radius, int iconRadius)//draws TFT_white ring around current item
{
    int x;
    int y;
    float radian = angle * 0.0174533;
    radian = -radian;
    y = radius * sin(radian);
    x = radius * cos(radian);
    y = y + centrey;
    x = x + centrex;
    tft.fillCircle(x, y, iconRadius + 2, TFT_WHITE);
}

/*
Function to clear (fill black) graphical indicator, draws black circle on either side of the current indicator
-angle refers to the desired position around the circle (degrees)
-radius refers to how far out from the centre it should be drawn
-iconRadius refers to how large the circular indicator should be
-oAngle refers to the spacing of the indicators in degrees, will be used to decide the placement of the black circles relative to the current indicator
*/

void clearSelector(int angle, int radius, int iconRadius, int oAngle)//removes last drawn selector
{
    int x;
    int y;
    float radian = (angle - oAngle) * 0.0174533;
    radian = -radian;
    y = radius * sin(radian);
    x = radius * cos(radian);
    y = y + centrey;
    x = x + centrex;
    tft.fillCircle(x, y, iconRadius + 2, TFT_BLACK);
    radian = (angle + oAngle) * 0.0174533;
    radian = -radian;
    y = radius * sin(radian);
    x = radius * cos(radian);
    y = y + centrey;
    x = x + centrex;
    tft.fillCircle(x, y, iconRadius + 2, TFT_BLACK);
}



/*Check the current state of the hall effect sensors and compare it against the last reading. If it has changed adjust the count variable and change the last state to the current state to stop further changing of count the count variable.*/

void check(){
if (state1 == 0){
  if (lastState2 == 0){
  count--;
  lastState2 = 1;
  lastState1 = 0;

  }
  if (lastState3 == 0){
  count++;
  lastState3 = 1;
  lastState1 = 0;

  }
}
if (state2 == 0){
  if (lastState1 == 0){
  count++;
  lastState1 = 1;
  lastState2 = 0;
 
  }
  if (lastState3 == 0){
  count--;
  lastState3 = 1;
  lastState2 = 0;

  }
}
if (state3 == 0){
  if (lastState1 == 0){
  count--;
  lastState1 = 1;
  lastState3 = 0;
 
  }
  if (lastState2 == 0){
  count++;
  lastState2 = 1;
  lastState3 = 0;

  }
}

}
//Draw graphical representations of the past and current state of the hall effect sensors
void drawIndicators(){
if (state2 == 0){
tft.fillRect(centrex-20,
centrey-20,50,20,TFT_GREEN);  
}else{
tft.fillRect(centrex-20,
centrey-20,50,20,TFT_RED);  
}

if(state1==0){
  tft.fillRect(centrex-80,
centrey-20,50,20,TFT_GREEN);
}else{
  tft.fillRect(centrex-80,
centrey-20,50,20,TFT_RED);
}

if(state3==0){
 tft.fillRect(centrex+40,
centrey-20,50,20,TFT_GREEN);
}else{
  tft.fillRect(centrex+40,
centrey-20,50,20,TFT_RED);
}
if (lastState2 == 0){
tft.fillRect(centrex-20,
centrey+10,50,20,TFT_GREEN);  
}else{
tft.fillRect(centrex-20,
centrey+10,50,20,TFT_RED);  
}

if(lastState1==0){
  tft.fillRect(centrex-80,
centrey+10,50,20,TFT_GREEN);
}else{
  tft.fillRect(centrex-80,
centrey+10,50,20,TFT_RED);
}

if(lastState3==0){
 tft.fillRect(centrex+40,
centrey+10,50,20,TFT_GREEN);
}else{
  tft.fillRect(centrex+40,
centrey+10,50,20,TFT_RED);
}

}