accelToServo.ino
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_LSM303.h>
#include <Servo.h>

Servo ForeAft;              // Define a Servo for Forward and Reverse Motion
Servo LeftRight;            // Define a Servo for Left and Right Motion
Adafruit_LSM303 lsm;
int accelMin = 16350;
int accelMax = -16350;
int servoMin = 0;
int servoMax = 180;
int ForeAft_Pin = 0;        // Plug Joystick Fore/Aft into Analog pin 0
int LeftRight_Pin = 1; 
int def_y;
int def_x;

void setup() 
{
#ifndef ESP8266
  while (!Serial);     // will pause Zero, Leonardo, etc until serial console opens
#endif
  Serial.begin(9600);
  
  // Try to initialise and warn if we couldn't detect the chip
  if (!lsm.begin())
  {
    Serial.println("Oops ... unable to initialize the LSM303. Check your wiring!");
    while (1);
  }
  ForeAft.attach(6);      // Plug a servo signal line into digital output pin 6
  LeftRight.attach(7);    // Plug a servo signal line into digital output pin 7
//  def_y = analogRead(ForeAft_Pin) ;              
//  def_x = analogRead(LeftRight_Pin) ;
}

void loop() 
{
  lsm.read();
  Serial.print("Accel X: "); Serial.print((int)lsm.accelData.x); Serial.print(" ");
  Serial.print("Y: "); Serial.print((int)lsm.accelData.y);       Serial.print(" ");
  Serial.print("Z: "); Serial.println((int)lsm.accelData.z);     Serial.print(" ");
  Serial.print("Mag X: "); Serial.print((int)lsm.magData.x);     Serial.print(" ");
  Serial.print("Y: "); Serial.print((int)lsm.magData.y);         Serial.print(" ");
  Serial.print("Z: "); Serial.println((int)lsm.magData.z);       Serial.print(" ");
  int ForeAft_Output = convertAccelToServo(lsm.accelData.x);
  int LeftRight_Output = convertAccelToServo(lsm.accelData.y);
  ForeAft.write(ForeAft_Output);                        // Command the Fore/Aft servo to a position
  LeftRight.write(LeftRight_Output);                    // Command the Left/Right servo to a position
  delay(100);
}

int convertAccelToServo(int y) {
  int result; 
  result = map(y, accelMin, accelMax, servoMin, servoMax);
  return result;
}