gear shifter driven by servo

hi everyone, newcomer have few questions in little project have been working on.

i have created simple code controls servo 2 different buttons. when pressed 1 turn servo left , 1 right. problem code works little wrong. servo turns when button pressed down , want make movement once button pressed. if press button real quick, servo goes position , comes back.

i hope don't sound confusing

here video of setup, , code

https://www.youtube.com/watch?v=g4btwh3sod0&feature=youtu.be

code: [select]

#include <servo.h>

servo myservo;
int button7=0;
int button6=0;
int pos=90;

void setup()
{
pinmode(7, input);
pinmode(6, input);
myservo.attach(9);
}

void loop()
{
button7=digitalread(7);
button6=digitalread(6);

myservo.write(pos);

delay(5);

pos=constrain(pos,0,180);

if(button7==1 && button6==0)
{
pos = 0;

}
if(button7==0 && button6==0)
{
pos = 90;

}
if(button7==0 && button6==1)
{
pos = 180;
}
}

1) please edit posting use code tags, explained in sticky thread.

2) buttons wired ground or vcc?

3) code handles 3 button states, perhaps 1 of them neither-button-pressed?
do want servo go somewhere everytime buttons aren't pressed?

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