[Student] Having problems with figuring out getting button to work with build

system · February 22, 2012, 11:27pm

So I'm new (to the forums, and the study of robotics), and am working on writing a code that adds count to a variable that will in turn change the display of a 7-segment display based on 4 buttons each representing a bit in a 4-bit setup

so here's what I have so far:

// Zane
// 7-Segment binary button

// set up
void setup()
{
  // 7-segment dispaly
  pinMode(2, OUTPUT); 
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  
  // buttons
  pinMode(10, INPUT);
  pinMode(11, INPUT);
  pinMode(12, INPUT);
  pinMode(13, INPUT);
  
  digitalWrite(9, 1);  // start with the "dot" off
}

void loop()
{
  // set each binary button to 0 for 0
  int binary_3 = 0;
  if (binary_3 > 1)
  {
    binary_3 =0
  }
  int binary_2 = 0;
  if (binary_2 > 1)
  {
    binary_2 =0
  }
  int binary_1 = 0;
  if (binary_1 > 1)
  {
    binary_1 =0
  }
  int binary_0 = 0;
  if (binary_0 > 1)
  {
    binary_0 =0
  }
  // =====================================
//  Button Press area.
//  Press binary button and adds 1
//  since conditions set before, if the button goes over 1, reset
//  
  // ======================================
  // Create light up sequence
  // Zero
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 0);
   digitalWrite(8, 1);
   delay(1000);
  }
  
  // One
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 0 && binary_0 == 1)
  {
   digitalWrite(2, 1);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 1);
   delay(1000); 
  }
  
  // Two
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 1 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 1);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 1);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Three
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 1 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Four
  if (binary_3 == 0 && binary_2 == 1 && binary_1 == 0 && binary_0 == 0)
  {
   digitalWrite(2, 1);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Five
  if (binary_3 == 0 && binary_2 == 1 && binary_1 == 0 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 1);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 1);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Six
  if (binary_3 == 0 && binary_2 == 1 && binary_1 == 1 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 1);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Seven
  if (binary_3 == 0 && binary_2 == 1 && binary_1 == 1 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 1);
   delay(1000);
   
   }
   
   // Eight
   if (binary_3 == 1 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
   {
     digitalWrite(2, 0);
     digitalWrite(3, 0);
     digitalWrite(4, 0);
     digitalWrite(5, 0);
     digitalWrite(6, 0);
     digitalWrite(7, 0);
     digitalWrite(8, 0);
     delay(1000);
   }
   
   // Nine
   if (binary_3 == 1 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
   {
     digitalWrite(2, 0);
     digitalWrite(3, 0);
     digitalWrite(4, 0);
     digitalWrite(5, 1);
     digitalWrite(6, 1);
     digitalWrite(7, 0);
     digitalWrite(8, 0);
     delay(1000);
   }
    
}

I do know that I'm going to need to have a delay after the button press for debouncing, but how am I making sure the button (which is set as active high) to read being pressed in the right time?

system · February 23, 2012, 12:35am

Hey Zane! I will try to help you out a bit with the simple stuff.

digitalWrite(9, 1); // start with the "dot" off

Should be - digitalWrite(9, LOW); // start with the "dot" off

binary_3 =0

Should be - binary_3 = 0;

binary_2 =0

Should be - binary_2 = 0;

binary_1 =0

Should be - binary_1 = 0;

// Create light up sequence
// Zero
if (binary_3 == 0 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
{
digitalWrite(2, 0);
digitalWrite(3, 0);
digitalWrite(4, 0);
digitalWrite(5, 0);
digitalWrite(6, 0);
digitalWrite(7, 0);
digitalWrite(8, 1);
delay(1000);
}

// One
if (binary_3 == 0 && binary_2 == 0 && binary_1 == 0 && binary_0 == 1)
{
digitalWrite(2, 1);
digitalWrite(3, 0);
digitalWrite(4, 0);
digitalWrite(5, 1);
digitalWrite(6, 1);
digitalWrite(7, 1);
digitalWrite(8, 1);
delay(1000);
}

// Two
if (binary_3 == 0 && binary_2 == 0 && binary_1 == 1 && binary_0 == 0)
{
digitalWrite(2, 0);
digitalWrite(3, 0);
digitalWrite(4, 1);
digitalWrite(5, 0);
digitalWrite(6, 0);
digitalWrite(7, 1);
digitalWrite(8, 0);
delay(1000);
}

// Three
if (binary_3 == 0 && binary_2 == 0 && binary_1 == 1 && binary_0 == 1)
{
digitalWrite(2, 0);
digitalWrite(3, 0);
digitalWrite(4, 0);
digitalWrite(5, 0);
digitalWrite(6, 1);
digitalWrite(7, 1);
digitalWrite(8, 0);
delay(1000);
}

// Four
if (binary_3 == 0 && binary_2 == 1 && binary_1 == 0 && binary_0 == 0)
{
digitalWrite(2, 1);
digitalWrite(3, 0);
digitalWrite(4, 0);
digitalWrite(5, 1);
digitalWrite(6, 1);
digitalWrite(7, 0);
digitalWrite(8, 0);
delay(1000);
}

// Five
if (binary_3 == 0 && binary_2 == 1 && binary_1 == 0 && binary_0 == 1)
{
digitalWrite(2, 0);
digitalWrite(3, 1);
digitalWrite(4, 0);
digitalWrite(5, 0);
digitalWrite(6, 1);
digitalWrite(7, 0);
digitalWrite(8, 0);
delay(1000);
}

// Six
if (binary_3 == 0 && binary_2 == 1 && binary_1 == 1 && binary_0 == 0)
{
digitalWrite(2, 0);
digitalWrite(3, 1);
digitalWrite(4, 0);
digitalWrite(5, 0);
digitalWrite(6, 0);
digitalWrite(7, 0);
digitalWrite(8, 0);
delay(1000);
}

// Seven
if (binary_3 == 0 && binary_2 == 1 && binary_1 == 1 && binary_0 == 1)
{
digitalWrite(2, 0);
digitalWrite(3, 0);
digitalWrite(4, 0);
digitalWrite(5, 1);
digitalWrite(6, 1);
digitalWrite(7, 1);
digitalWrite(8, 1);
delay(1000);

}

// Eight
if (binary_3 == 1 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
{
digitalWrite(2, 0);
digitalWrite(3, 0);
digitalWrite(4, 0);
digitalWrite(5, 0);
digitalWrite(6, 0);
digitalWrite(7, 0);
digitalWrite(8, 0);
delay(1000);
}

// Nine
if (binary_3 == 1 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
{
digitalWrite(2, 0);
digitalWrite(3, 0);
digitalWrite(4, 0);
digitalWrite(5, 1);
digitalWrite(6, 1);
digitalWrite(7, 0);
digitalWrite(8, 0);
delay(1000);
}

It should be:

  // Create light up sequence
  // Zero
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 0);
   digitalWrite(8, 1);
   delay(1000);
  }
  
  // One
  else if (binary_3 == 0 && binary_2 == 0 && binary_1 == 0 && binary_0 == 1)
  {
   digitalWrite(2, 1);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 1);
   delay(1000); 
  }
  
  // Two
  else if (binary_3 == 0 && binary_2 == 0 && binary_1 == 1 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 1);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 1);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Three
  else if (binary_3 == 0 && binary_2 == 0 && binary_1 == 1 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Four
  else if (binary_3 == 0 && binary_2 == 1 && binary_1 == 0 && binary_0 == 0)
  {
   digitalWrite(2, 1);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Five
  else if (binary_3 == 0 && binary_2 == 1 && binary_1 == 0 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 1);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 1);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Six
  else if (binary_3 == 0 && binary_2 == 1 && binary_1 == 1 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 1);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Seven
  else if (binary_3 == 0 && binary_2 == 1 && binary_1 == 1 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 1);
   delay(1000);
   
   }
   
   // Eight
   else if (binary_3 == 1 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
   {
     digitalWrite(2, 0);
     digitalWrite(3, 0);
     digitalWrite(4, 0);
     digitalWrite(5, 0);
     digitalWrite(6, 0);
     digitalWrite(7, 0);
     digitalWrite(8, 0);
     delay(1000);
   }
   
   // Nine
   else if (binary_3 == 1 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
   {
     digitalWrite(2, 0);
     digitalWrite(3, 0);
     digitalWrite(4, 0);
     digitalWrite(5, 1);
     digitalWrite(6, 1);
     digitalWrite(7, 0);
     digitalWrite(8, 0);
     delay(1000);
   }

Now you can't have 1 or 0 if it is a digitalWrite. It needs to be HIGH or LOW so you need to change that!

Hope this helps!

system · February 23, 2012, 2:27am

Thanks for the reply, I'm far from finished with this, but when I tested with digitalWrite(#, 1) and etc, they work the same as low and high.

I'm more curious to how am I to go about getting the buttons to work.

as to why it says 0 for on, I do not know, or maybe it's just the display I'm using, why but having it HIGH causes the lights to be off.

but I still need clearance on how I would go about having the button input added.

pYro_65 · February 23, 2012, 2:39am

When the arduino due comes out for example, the digital pins have more modes than just on/off on the ARM processor. So the values of HIGH and LOW could change to something arbitrary, so when you explicitly put in 1 & 0 you prevent your code from being compatible with possible future releases of the Arduino core.

EDIT: Also you need digitalRead to read the button values.

system · February 24, 2012, 5:52pm

Hey TECman! I will try to help you out a bit with the simple stuff.

Should be -

Code:

digitalWrite(9, LOW); // start with the "dot" off

If you look carefully at the code, you'll recognize that the display is a common anode device, so it is quite correct to write a 1 to turn the segment off.

system · February 25, 2012, 6:07am

Hello guys, I've done a bit of updating on the code, and everything works fine except for the buttons x.x

before you read the code, please read what the code is supposed to do.

there are four buttons,
the 7-segment display lights up when they are LOW.

I have each set of display sequences set to a pattern represented by the binary variables.

When I press one of the four buttons, the following binary number represented by said button (I.E. button 3 goes to binary_3 - which is in the order "3 2 1 0") should increase by "1" followed by a delay for debounce.

when the button is pressed again, it adds 1 (making 2) but due to prior coding in the loop, when the number is > 1 it resets to 0.

but for some reason, the buttons aren't working, and all that will display on the segment is "0".

Here's the new code:

// Zane
// 7-Segment binary button

// set up

// buttons

int binary_button_3 = 10;
int binary_button_2 = 11;
int binary_button_1 = 12;
int binary_button_0 = 13;

// binary data
int binary_3 = 0;
int binary_2 = 0;
int binary_1 = 0;
int binary_0 = 0;

  
void setup()
{
  // 7-segment dispaly
  pinMode(2, OUTPUT); 
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
   
  
  pinMode(binary_button_3, INPUT);
  pinMode(binary_button_2, INPUT);
  pinMode(binary_button_1, INPUT);
  pinMode(binary_button_0, INPUT);
  
  digitalWrite(9, 1);  // start with the "dot" off
}

void loop()
{
  // set each binary button to 0 for 0
  if (binary_3 > 1)
  {
    binary_3 =0;
  }

  if (binary_2 > 1)
  {
    binary_2 =0;
  }

  if (binary_1 > 1)
  {
    binary_1 =0;
  }

  if (binary_0 > 1)
  {
    binary_0 =0;
  }
  // =====================================
//  Button Press area.
//  Press binary button and adds 1
//  since conditions set before, if the button goes over 1, reset



  digitalRead(binary_button_3);
  digitalRead(binary_button_2);
  digitalRead(binary_button_1);
  digitalRead(binary_button_0);
   
  if(binary_button_3 == HIGH)
  {
    binary_3 += 1;
    delay(100); // debounce
  }

  if(binary_button_2 == HIGH)
  {
    binary_2 += 1;
    delay(100); // debounce
  }

  if(binary_button_1 == HIGH)
  {
    binary_1 += 1;
    delay(100); // debounce
  }

  if(binary_button_0 == HIGH)
  {
    binary_0 += 1;
    delay(100); // debounce
  }  
  
  // ======================================
  // Create light up sequence
  // Zero
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 0);
   digitalWrite(8, 1);
   delay(1000);
  }
  
  // One
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 0 && binary_0 == 1)
  {
   digitalWrite(2, 1);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 1);
   delay(1000); 
  }
  
  // Two
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 1 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 1);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 1);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Three
  if (binary_3 == 0 && binary_2 == 0 && binary_1 == 1 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Four
  if (binary_3 == 0 && binary_2 == 1 && binary_1 == 0 && binary_0 == 0)
  {
   digitalWrite(2, 1);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Five
  if (binary_3 == 0 && binary_2 == 1 && binary_1 == 0 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 1);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 1);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Six
  if (binary_3 == 0 && binary_2 == 1 && binary_1 == 1 && binary_0 == 0)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 1);
   digitalWrite(4, 0);
   digitalWrite(5, 0);
   digitalWrite(6, 0);
   digitalWrite(7, 0);
   digitalWrite(8, 0);
   delay(1000);
  }
  
  // Seven
  if (binary_3 == 0 && binary_2 == 1 && binary_1 == 1 && binary_0 == 1)
  {
   digitalWrite(2, 0);
   digitalWrite(3, 0);
   digitalWrite(4, 0);
   digitalWrite(5, 1);
   digitalWrite(6, 1);
   digitalWrite(7, 1);
   digitalWrite(8, 1);
   delay(1000);
   
   }
   
   // Eight
   if (binary_3 == 1 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
   {
     digitalWrite(2, 0);
     digitalWrite(3, 0);
     digitalWrite(4, 0);
     digitalWrite(5, 0);
     digitalWrite(6, 0);
     digitalWrite(7, 0);
     digitalWrite(8, 0);
     delay(1000);
   }
   
   // Nine
   if (binary_3 == 1 && binary_2 == 0 && binary_1 == 0 && binary_0 == 0)
   {
     digitalWrite(2, 0);
     digitalWrite(3, 0);
     digitalWrite(4, 0);
     digitalWrite(5, 1);
     digitalWrite(6, 1);
     digitalWrite(7, 0);
     digitalWrite(8, 0);
     delay(1000);
   }
    
}

system · February 25, 2012, 9:41am

I have read a post in the past about how quickly a main loop cycles but I don't remember how to calculate it. However, what I think is happening is that when you press a button, it is counting faster than you think so it is counting to two before you can release your button and going back to 0. The problem is compounded by the fact that you have not truly debounced your button in the code. That after each button state check is not going to do it since you can get bounce when you press the button as well as when you release.

I moved your zero reset. This cleans the code up a bit.

boolean lastbutton0 = LOW;
boolean currentbutton0 = HIGH;
boolean lastbutton1 = LOW;
boolean currentbutton1 = HIGH;
boolean lastbutton2 = LOW;
boolean currentbutton2 = HIGH;
boolean lastbutton3 = LOW;
boolean currentbutton3 = HIGH;


void loop()
{
 //Debounce button
  currentbutton0 = debounce(lastbutton0,binary_button_0);

  if (lastbutton0 == LOW && currentbutton0 == HIGH) 
  {
  binary_0++;
  if (binary_0 > 1) 
  {
   binary_0 = 0;
  }
  }

 //Debounce button
  currentbutton1 = debounce(lastbutton1,binary_button_1);

  if (lastbutton1 == LOW && currentbutton1 == HIGH) 
  {
  binary_1++;
  if (binary_1 > 1) 
  {
   binary_1 = 0;
  }
  }

 //Debounce button
  currentbutton2 = debounce(lastbutton2,binary_button_2);

  if (lastbutton2 == LOW && currentbutton2 == HIGH) 
  {
  binary_2++;
  if (binary_2 > 1) 
  {
   binary_2 = 0;
  }
  }


 //Debounce button
  currentbutton3 = debounce(lastbutton3,binary_button_3);

  if (lastbutton3 == LOW && currentbutton3 == HIGH) 
  {
  binary_3++;
  if (binary_3 > 1) 
  {
   binary_3 = 0;
  }
  }

}




//Debounce Routine
boolean debounce(boolean last, int buttonpin)
{
  boolean current = digitalRead(buttonpin);
  if (last != current) 
  {
    delay(50);
    current = digitalRead(buttonpin);
  }
  return current;
}

system · February 25, 2012, 12:29pm

but for some reason, the buttons aren't working, and all that will display on the segment is "0".

So, are we chasing a hardware problem or a software problem? You are not enabling the internal pullup resistors. Therefore, you must have external pullup or pulldown resistors. Since the test is for HIGH to mean the the switch is pressed, this implies that the switch is wired in a pulldown configuration.

So, exactly how are your switches wired?

system · February 26, 2012, 2:20am

I have four buttons, each connected to a resistor (not sure what makes it a pull up, over a pull down.) and each button is connected to a pin on the board.

I can take a picture if you'd like.

I was thinking that the problem was software side.

retrolefty · February 26, 2012, 4:21am

zane203:
I have four buttons, each connected to a resistor (not sure what makes it a pull up, over a pull down.) and each button is connected to a pin on the board.

I can take a picture if you'd like.

I was thinking that the problem was software side.

Yes a clear picture, or better yet a schematic drawing, even if hand drawn and photographed. I suspect you don't have the resistors wired correctly. Also the value of the resistors would be helpful to know.

Lefty

system · February 26, 2012, 6:22am

system · February 26, 2012, 9:31am

That's not quite correct. You need to have the arduino pin connected through the resistor to ground AND the button. The other side of the button should be connected to Vcc (5V)

PIN --- resistor --- ground
     |
     |
  button --- 5V

The resistor should be "gently pulling" the pin to ground when the button is not pressed. When the button gets pressed, then it "strongly pulls" the pin to 5V, "overpowering" the resistor

system · February 26, 2012, 8:47pm

I've redesigned the buttons and inputs, and now It's constantly showing "8"...

I've tried moving a lot of things around, but I'm starting to think that I'm just not getting the hang of this stuff =/

I want to thank you guys for all your help but I think I might either just change majors or possibly transfer to a school that moves slower and can teach me in smaller steps and more hands on...

system · February 26, 2012, 8:53pm

The simplest way to debug a program like this is to get it to talk to you.
Serial.print is your friend

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[Student] Having problems with figuring out getting button to work with build

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