Noisy digital output

Hello, I have my Arduino connected to a 4 button micro switch joystick, each switch is connected to a different digital IO pin, with resistor going to ground, it reads the state of the switches, then depending on which switch is pushed sends a high output to a different digital IO pin. I intend on connecting these outputs to a motor driver. When I pull the joystick backward It works perfectly with a high signal (I checked the outputs with an oscilloscope) the problem is that when I push the joystick forward, rather than getting a high signal from the pin I get what looks like a messy square wave. I used the digitalwrite function for both directions, and even if I change the output pins I get the same problem. Here is my code

// set pin numbers:
const int JoystickFWD = 2;     // the number of the pin attached to forward on joystick
const int FWD1 = 6;          // the number of the pin attached to h bridge FWD1 pin (Left motor forward)
const int FWD2 = 5;           // the number of the pin attached to h bridge FWD2 pin (Right motor forward)
const int JoystickBACK = 4;    // the number of the pin attached to back on joystick
const int BACK1 = 10;          // the number of the pin attached to h bridge BACK1 pin (Left motor back)
const int BACK2 = 11;          // the number of the pin attached to h bridge BACK2 pin (Right motor back)
const int JoystickLEFT = 7;    // the number of the pin attached to left on the joystick
const int JoystickRIGHT = 8;   // the number of the pin attached to right on the joystick


// variables will change:
int buttonState = 0;         // variable for reading the Joystick Direction

void setup() {
  // initialize the h bridge pins as outputs:
  pinMode(FWD1, OUTPUT);
  pinMode(FWD2, OUTPUT);
  pinMode(BACK1,OUTPUT);
  pinMode(BACK2,OUTPUT);
    
  // initialize the joystick directions as inputs:
  pinMode(JoystickFWD, INPUT);
  pinMode(JoystickBACK, INPUT);
  pinMode(JoystickLEFT, INPUT);
  pinMode(JoystickRIGHT, INPUT); 
}

void loop(){
  // read the state of the pushbutton value:
  buttonState = digitalRead(JoystickFWD);

  // check if the joystick is pushed forward.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH){     
    // turn motors on:    
    digitalWrite(FWD1, HIGH);
    digitalWrite(FWD2, HIGH);
  } 
  else {
    // turn motors off:
    digitalWrite(FWD1, LOW);
    digitalWrite(FWD2,LOW);
  }
  
  buttonState = digitalRead(JoystickBACK);
  
  if (buttonState == HIGH){
    digitalWrite(BACK1, HIGH);
    digitalWrite(BACK2, HIGH);
  }
  else {
    
    digitalWrite(BACK1, LOW);
    digitalWrite(BACK2,LOW);
  }
 buttonState = digitalRead(JoystickLEFT);

 if (buttonState == HIGH){
   digitalWrite (FWD1, HIGH);
 }
 else {
   digitalWrite(FWD1,LOW);
   }
   buttonState = digitalRead(JoystickRIGHT);
   
   if (buttonState == HIGH){
     digitalWrite (FWD2, HIGH);
   }
   else{
     digitalWrite(FWD2, LOW);
   }
     
}

Any suggestions?

Any suggestions?

Check your wiring.

Any reason for not using the free pull-ups provided by the AVR?

@AWOL: The person has crossposted... http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1291171185

:frowning:

Another one for the blacklist.