Hi to everyone. I am an absolute newbie to Arduino Micro and programming.i would like to use this code with an 4x4keypad. Any hints which changes i need? tnx a lot.
/* keyPadHiduino Example Code
by: Jim Lindblom
date: January 5, 2012
license: MIT license. If you find this code useful, please
feel free to use this code however you'd like, commercially
or otherwise. Just keep this license on there whatever you do.
This code implements a 12-key USB keypad. You can type 0-9,
* is the + sign and the # key is enter. I'm using SparkFun's
12-button keypad, your pinouts may vary. Multi-touch is
not supported.
SparkFun Keypad Pinout:
Rows and columns are connected as such:
-------------
| 1 | 2 | 3 | - 3
| 4 | 5 | 6 | - 7
| 7 | 8 | 9 | - 6
| * | 0 | # | - 1
-------------
| | |
2 4 5
*/
// Pins 1-7 of the keypad connected to the Arduino respectively:
int keypadPins[7] = {2, 3, 4, 5, 10, 16, 14};
int keypadStatus; // Used to monitor which buttons are pressed.
int timeout; // timeout variable used in loop
void setup()
{
for (int i=0; i<7; i++)
{
pinMode(keypadPins, INPUT); // Set all keypad pins as inputs
digitalWrite(keypadPins, HIGH); // pull all keypad pins high
}
}
void loop()
{
keypadStatus = getKeypadStatus(); // read which buttons are pressed
if (keypadStatus != 0) // If a button is pressed go into here
{
sendKeyPress(keypadStatus); // send the button over USB
timeout = 2000; // top of the repeat delay
while ((getKeypadStatus() == keypadStatus) && (--timeout)) // Decrement timeout and check if key is being held down
delayMicroseconds(1);
while (getKeypadStatus() == keypadStatus) // while the same button is held down
{
sendKeyPress(keypadStatus); // continue to send the button over USB
delay(50); // 50ms repeat rate
}
}
}
/* sendKeyPress(int key): This function sends a single key over USB
It requires an int, of which the 12 LSbs are used. Each bit in
key represents a single button on the keypad.
This function will only send a key press if a single button
is being pressed */
void sendKeyPress(int key)
{
switch(key)
{
case 1: // 0x001
Keyboard.write('1'); // Sends a keyboard '1'
break;
case 2: // 0x002
Keyboard.write('2');
break;
case 4: // 0x004
Keyboard.write('3');
break;
case 8: // 0x008
Keyboard.write('4');
break;
case 16: // 0x010
Keyboard.write('5');
break;
case 32: // 0x020
Keyboard.write('6');
break;
case 64: // 0x040
Keyboard.write('7');
break;
case 128: // 0x080
Keyboard.write('8');
break;
case 256: // 0x100
Keyboard.write('9');
break;
case 512: // 0x200
Keyboard.write('+');
break;
case 1024: // 0x400
Keyboard.write('0'); // Sends a keyboard '0'
break;
case 2048: // 0x800
Keyboard.write('\n'); // Sends the 'ENTER' key
break;
}
}
/* getKeypadStatus(): This function returns an int that represents
the status of the 12-button keypad. Only the 12 LSb's of the return
value hold any significange. Each bit represents the status of a single
key on the button pad. '1' is bit 0, '2' is bit 1, '3' is bit 2, ...,
'#' is bit 11.
This function doesn't work for multitouch.
*/
int getKeypadStatus()
{
int rowPins[4] = {keypadPins[2], keypadPins[6], keypadPins[5], keypadPins[0]}; // row pins are 2, 7, 6, and 1 of the keypad
int columnPins[3] = {keypadPins[1], keypadPins[3], keypadPins[4]}; // column pins are pins 2, 4, and 5 of the keypad
int keypadStatus = 0; // this will be what's returned
/* initialize all pins, inputs w/ pull-ups */
for (int i=0; i<7; i++)
{
pinMode(keypadPins, INPUT);
digitalWrite(keypadPins, HIGH);
}
for (int row=0; row<4; row++)
{ // initial for loop to check all 4 rows
pinMode(rowPins[row], OUTPUT); // set the row pin as an output
digitalWrite(rowPins[row], LOW); // pull the row pins low
for (int col=0; col<3; col++)
{ // embedded for loop to check all 3 columns of each row
if (!digitalRead(columnPins[col]))
{
keypadStatus |= 1 << ((row+1)*3 + (col+1) - 4); // set the status bit of the keypad return value
}
}
pinMode(rowPins[row], INPUT); // reset the row pin as an input
digitalWrite(rowPins[row], HIGH); // pull the row pin high
}
return keypadStatus;
}
