Push button DC Motor Control - Ramp up Speed

hey guys,
new arduino have been looking past few months @ examples , practicing on own guide of examples. me major working on senior design project ramping speed on 12v dc motor 0 100% once momentary push button engaged. have motor hooked 12v source in parallel diode , small capacitor.  these 3 input npn transistor motor @ collector , ground @ emitter. have arduino output (pin 10) hooked base of transistor 1k resistor between protect arduino current coming 12v source. have momentary push button receiving power arduino 5v source , providing input arduino @ pin 9.

my issue when push switch, motor turns on not shut off. have tried adding while loop (which commented out @ end) motor not run @ when this.

here code far

code: [select]

//set pin numbers

const int pushbutton = 9;      // seat engaged push button attached pin 9
const int transistor = 10;     // digital output sent transistor pin 10

int buttonstate = 0;           // variable reading pushbutton, high when pressed
int motorstate = 0;            // value of state of motor, high when throttle engaged

void setup() {
  // initialize transistor output
  pinmode(transistor, output);
  // initialize pushbutton input
  pinmode(pushbutton, input);
}

void loop() {    // put main code here, run repeatedly:
  // read state of pushbutton
  buttonstate = digitalread(pushbutton);
 
  // while engaged ramp power transistor
 
    while(buttonstate == high) {
      // ramp analog voltage signal transistor
      int = 0;
      if (i < 255) {
        analogwrite(transistor,i);
        = + 1;
        delay(10);
      }
      if (i = 255) {
        analogwrite(transistor,255);
        delay(10);
      }
    }
    //while(buttonstate == low) {
    //  analogwrite(transistor,0);
    //}
}
thanks help,
kyle

is push button input floating?

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