certain input to arduino nano bricks the board [solved]

Development Tools IDE 1.x
1

Hey all,

I recently purchased 3 arduino nano clones and wanted make a simple test on the servo that I also just bought. I connected the servo to pin 10 and a button to pin 7, and when the button is pushed the servo moves 180 degrees, the program then delays for 2 seconds and resets the servo to 0 degrees . When I run the code it works fine, but if I push the button a second time before the servo resets to 0 it completely breaks the board. I managed to break 2 out of the 3 nano boards. On one board the tx, pow, and L LEDS stay lit and will give me problems when I try to upload code to it. On the other board just the power light stays on and all the pins get hot when connected to power. can someone please help me understand what I'm doing wrong so I don't break my last nano.

note: when I try this on my arduino mega it does not have this problem.

here is my code:

#include <Servo.h>

Servo myservo;
int button = 0;


void setup() {
  // put your setup code here, to run once:
myservo.attach(10);//select servo pin(9 or 10, only to control two pins) 
pinMode(7, INPUT);
pinMode(9, OUTPUT);
pinMode(22, OUTPUT);
pinMode(2, OUTPUT);
digitalWrite(2, HIGH);

Serial.begin(9600);
}


void loop() {
  // put your main code here, to run repeatedly

button = digitalRead(7);
Serial.println(button);


if(button == 1) 
{ digitalWrite(22, HIGH); //dc motor on
  
  myservo.write(180);
  delay(1000);
  digitalWrite(22, LOW);//dc motor off
  delay(1000);
}

else myservo.write(0);

}

note: Ignore anything done with pin 22 and 2 I used it to power a dc motor on the arduino mega, but was not connected when I broke the nano boards.

2

I seriously doubt is a code problem.

http://playground.arduino.cc/Main/ArduinoPinCurrentLimitations

3

Yeah, so I'm a little embarrassed about this one. I forgot to mention that the push button I was using was from a PS2 analog stick module, where the soldered pins are exposed on the bottom, because I had it laying there and was too lazy to plug a resistor with an actual push button. I stupidly and ignorantly just placed the module on the bottom slide out part of my desk which is metal instead of the desk itself which is glass. You can probably guess what happened next with the pins basically all connected to each other on the joy stick module.