Teensy 3.1 auto login sketch
I recently got a Teensy 3.1 and have been looking for little projects to do.
This is a quick one that I wrote that, when plugged in, automatically logs me into my computer.
It uses the basic keyboard emulation to send keys to the computer, typing in my password.
It uses 3 char arrays, with the letters/numbers properly offset so that its easy to send the proper int to the usb_keyboard_press function
char keysLower[31] = "0000abcdefghijklmnopqrstuvwxyz";
char keysUpper[31] = "0000ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char nums[68] = "pppppppppppppppppppppppppppppp1234567890";
You call
writeWord("Mywordtowrite");
here is the function - it just loops through each char and calls the proper write method
void writeWord(char sWord[])
{
int i;
char *p;
p = sWord;
for(i = 0;p[ i ];i++)
{
if(isNumber(p[ i ]))
writeNumber(p[ i ]);
else
writeLetter(p[ i ]);
delay(50);
}
usb_keyboard_press(40,0);
}
Here is writeNumber
void writeNumber(char number)
{
char *ptr = strchr(nums,number); //try to find the char in the array
if(ptr){
int index = ptr - nums; //get the index of the char in the array - this should match the proper int for the keyboard
int ascii = (int) number;
usb_keyboard_press(index,0); //write out that number
}
}
And finally - writeLetter, which checks (based on ASCII value) if the char is Upper or lower and applies the proper key modified (KEY_SHIFT)
void writeLetter(char letter)
{
if(letter == '(')
{
usb_keyboard_press(KEY_9,KEY_SHIFT);
return;
}
if(isUpper(letter))
{
char *ptr = strchr(keysUpper,letter);
if(ptr){
int index = ptr - keysUpper;
int ascii = (int) letter;
if(isUpper(letter))
usb_keyboard_press(index,KEY_SHIFT);
else
usb_keyboard_press(index,0);
}
}
else
{
char *ptr = strchr(keysLower,letter);
if(ptr){
int index = ptr - keysLower;
int ascii = (int) letter;
if(isUpper(letter))
usb_keyboard_press(index,KEY_SHIFT);
else
usb_keyboard_press(index,0);
}
}
}
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