4 X 3 Flexible Matrix Keypad Membrane Switch Keyboard Raindrops Per pin max current allowed

Per pin max current allowed is 40 mA

all of the micro metal gearmotors have the same physical dimensions (though the terminal size and separation on the HPCB versions differ slightly from the other versions)

Relays terminals (COMMON

11b/g/n WiFi Bluetooth N/A Bluetooth 4

Hard anodized finish

4 X 3 Flexible Matrix Keypad Membrane Switch Keyboard Raindrops Per pin max current allowedThis Matrix Keypad 3 X 4 has 12 buttons, arranged in a telephone line 3x4 grid. The keys are connected into a matrix,hence only 7 microcontroller pins (3 columns and 4 rows) are required to scan the pad. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. The keys are connected into a matrix, so you only need 7 microcontroller pins (3 columns and 4 rows) to scan