DIY Rudder Pedals for Flight Simulator

#include <SPI.h>  

#define CS_RUDDER 10 
#define CS_LEFT 8 
#define CS_RIGHT 9 
#define SENSOR_LEFT_PEDAL A6
#define SENSOR_RIGHT_PEDAL A5
#define SENSOR_RUDDER_LEFT A0
#define SENSOR_RUDDER_RIGHT A1

int val_left, val_right, remap_left, remap_right, rudder,
    val_brake_left, val_brake_right, remap_brake_left, remap_brake_right;

int tuning_rudder = 128;
// int tuning_left_brake = 255;
// int tuning_right_brake = 255;

void setup() {
  Serial.begin(9600);
  SPI.begin();    
  pinMode (CS_RUDDER, OUTPUT);   
  pinMode (CS_LEFT, OUTPUT);   
  pinMode (CS_RIGHT, OUTPUT);  
}

void loop() {
 
  // --------------------------------------------------------
  // RUDDER PEDALS          -128 --- x --- 128
  // --------------------------------------------------------

  // Read and remap sensor RUDDER LEFT 
  val_left = analogRead(SENSOR_RUDDER_LEFT);
  if (val_left <= 950) { 
    remap_left = map(val_left, 30, 870, -128, 0); // -40
  }
  else remap_left = 0;
  // Set limitations RUDDER LEFT 
  if (remap_left > 0) remap_left = 0;
  if (remap_left <= -128) remap_left = -128;  

  // Read and remap sensor RUDDER RIGHT   
  val_right = analogRead(SENSOR_RUDDER_RIGHT);
  if (val_right <= 950) {
    remap_right = map(val_right, 0, 820, 132, 0); // -50
  }
  else remap_right = 0;  
  //Set limitations RUDDER RIGHT   
  if (remap_right < 0) remap_right = 0;
  if (remap_right >= 127) remap_right = 127;  
  
  rudder = remap_left + remap_right;
  

   if (remap_left == 0) {
      tuning_rudder = tuning_rudder + 128;
   }
   else {
      tuning_rudder = abs(tuning_rudder - 128);
   }

  // --------------------------------------------------------
  // BRAKING
  // --------------------------------------------------------  

  val_brake_left = analogRead(SENSOR_LEFT_PEDAL);

  if (val_brake_left <= 328) {
    remap_brake_left = map(val_brake_left, 200, 328, 0, 255);
  }
  else remap_brake_left = 255; 
  if (remap_brake_left < 0) remap_brake_left = 0;

  val_brake_right = analogRead(SENSOR_RIGHT_PEDAL);  
  if (val_brake_right <= 328) {
    remap_brake_right = map(val_brake_right, 200, 328, 0, 255);
  }
  else remap_brake_right = 255; 
  if (remap_brake_right < 0) remap_brake_right = 0;  

/* 
  // ARDUINO SETUP

  // Neutral sensors setup
  Serial.print(val_left); 
  Serial.print(" | " );     
  Serial.println(val_right);
  delay(400);

  // Output setup
  Serial.print(remap_brake_left); 
  Serial.print(" | " ); 
  Serial.println(remap_brake_right); 
  Serial.print(" | " );   
  Serial.print(rudder); 
  Serial.print(" | " );     
  Serial.println(tuning_rudder);
  delay(400);
*/

  // --------------------------------------------------------
  // SEND DATA TO digiPOTs
  // -------------------------------------------------------- 

    digitalWrite(CS_RUDDER, LOW); 
    SPI.transfer(0b00010001);   
    SPI.transfer(tuning_rudder);          
    digitalWrite(CS_RUDDER, HIGH);
    delay(5); // Delay for data time smoothing
    
    digitalWrite(CS_LEFT, LOW); 
    SPI.transfer(0b00010001);   
    SPI.transfer(remap_brake_left);          
    digitalWrite(CS_LEFT, HIGH);
    delay(5);

    digitalWrite(CS_RIGHT, LOW); 
    SPI.transfer(0b00010001);   
    SPI.transfer(remap_brake_right);          
    digitalWrite(CS_RIGHT, HIGH);
    delay(5);
}