16-button membrane keyboard with interface component for microcontroller projects.
16-button membrane keyboard with interface component for microcontroller projects.
Convenient adhesive backing provides a simple way to mount the keypad in a variety of applications.
Application Ideas:
Matrix keypads use a combination of four rows and four columns to provide button states to the host device, typically a microcontroller. Underneath each key is a pushbutton, with one end connected to one row, and the other end connected to one column. These connections are shown here:
In order for the microcontroller to determine which button is pressed, it first needs to pull each of the four column s (pins 1-4 ) either low or high one at a time , and then poll the states of the four rows (pins 5-8). Depending on the states of the columns, the microcontroller can tell which button is pressed.
Maximum Rating | 24VDC, 30mA |
Lifetime | 1 million clicks or more |
Reclosing time | ≤5ms |
Interface | 8-pin access to 4×4 matrix |
Dimensions keypad | 69mm×76mm (2.7in×3.0in) |
Dimension Cable | 20mm×85mm (0.78in×3.5in) |
Operating temp range | 0 to 50 °C (32 to 122 °F) |