Code?

[stop()]

Please fix this

if (accelerationX >  500) control = B00000001; //tilt back
  if (accelerationX < -500) control = B00000010; //tilt forward
  if (accelerationY >  500) control = B00000011; //tilt right
  if (accelerationY < -500) control = B00000100; //tilt lfet
  if (accelerationX <  500) {
  if (accelerationY <  500) {
  if (accelerationX > -500) {
  if (accelerationY > -500) control = B00000000;}}} //back to blank state

For your last "control = B00000000" just use an ELSE statement.


Next, why does stop() need to be in every movement? Also all those delays are going to make your code very sluggish. Look into the "Blink Without Delay" example, it will help you greatly.

When does previousValue get updated? I would think the previousValue is the old peak value, so you can just substitute previousValue with peakValue, and it should work.

@PaulS

I wanted the OP to answer that.

[==]

What is this doing and why is it written like this?

while (Serial.available() == 0);

Try this, http://cboard.cprogramming.com/cplusplus-programming/23177-convert-decimal-int-hex.html

You can maybe use strtok() to split the string into smaller parts and then use indexOf() to filter out the rest.
Try this, http://arduino.cc/en/Tutorial/StringIndexOf

You can just go straight to processing, no putty needed.

What is wrong here?

int input = Serial.read(); //read data

Your cases are looking for CHARs but your giving it INTs (hint hint)

The reason those "servos" will not work is because they lack the key feature normal servos have, which is a potentiometer. The potentiometer is the only way for the servo to get feed back from its position. You take that out, and it becomes a continiously rotating motor.

Added: why not just use a rotorary encoder to keep track of the position?

No, but you can get a Mega which has more PWM pins on it to choose from.

[//Analog operation to read Wiper delay <== Should there be something else here? {]

 //Analog operation to read Wiper delay     <== Should there be something else here?
 {                                                       <== IF / Else statement? This is just an open bracket, with nothing before it.
  raw = analogRead(analogPin);    // Reads the Input PIN
  Vout = (5.0 / 1023.0) * raw;    // Calculates the Voltage on th Input PIN
  buffer = (Vin / Vout) - 1;
  R2 = R1 / buffer;
if (R2>3.7 && R2<4){


Added: Those line you commented out, how did you come to the conclusion it was those particular lines?

No, that is more of Processing, it's another program that the arduino software was based off of. I personally don't use processing , so I don't know how to go about making a graph, but that is what you need to look into.

If you want a battery to power your arduino, go with one of these. http://www.batteryspace.com/96vrccarbatterypackseries.aspx

Post your code as of now, I you made any changes.