3x4 Matrix Keypad for Micro Controller. Robust plastic, hard keys, fits Arduino etc.
This black keypad with white letters comes with 12 tactile switches. The resistance of a pressed key element is <1k Ohm. An operation voltage of 35V and a maximum current of 10mA per switch element must not be exceeded.
A library, supporting this Matrix Keypad, is available for example within the Arduino IDE.
Dimensions: 51.5 x 69mm
Marc –
i have spend time to find the lines.. on Arduino-Uno, i use D0 to D7 (shift to D3 to D9 if you use the serial terminal because D0-D1 are the communication lines and the keypad will be jammed) directly on the connector and so, the keypad is on the Arduino, not in the air.. (don’t use/solder the first and the last hole of the KeyPad).. for to be compatible with the keypad library, write those code lines:byte ROWS = 4;byte COLS = 3;byte rowPins[ROWS] = ;byte colPins[COLS] = ;char hexaKeys[ROWS][COLS] = };with those code lines, all work fine!to have the decimal (0-9) value, use this line:decimal_number = customKey – 48;
Robert Leedham (verified owner) –
A heads up – the pads are not on 0.1″ spacing; can’t use on a breadboard.
Seems OK otherwise.