4x4 Matrix Keypad

Overview:

A 4x4 matrix keypad requiring eight Input/Output ports for interfacing isused as an example. Rows are connected to Peripheral Input/Output (PIO) pins configured as output. Columns are connected to PIO pins configured as input with interrupts. In this configuration, four pull-up resistors must be added in order to apply a high level on the corresponding input pins.

4x4 Matrix Keypad:

Functionality & Feature Set:

• Contact debouncing.
• Easy to interface. Board features 16 push buttons arranged as 4x4 matrix.
• Data Valid output signal for interrupt activation.
• Interfaces to any microcontroller or microprocessor.
• Cost effective for OEM applications.
• Operating force: 60 ± 20 cN.
• Key lifetime: 1 x 109million operations.
• Low power consumption.

ARM Schematic:

ARM Code:
For Arm Code Click Here

ATMEL Schematic:

ATMEL Code:For Atmel Code Click Here

PIC Schematic:

PIC CODE:
For Pic Code Click Here

4 Keys keypad

Overview:

  It has 4 keys which can be connect to microcontroller directly. KEY is a small key pad designed to data entries for microcontroller board.The board has 5-pin header for 5-wire ribbon cable. It doesn't need any power supply. It will take logics of microcontroler's pins to ground when it is pressed. 

4 Keys keypad

Features:

• 4 keys.
• Connect to microcontroller's pin directly.
• 5-pin header.
• Logic Data High or Low
• Input pins connecetd to Burgstick

Circuit Diagram

For Code & Design Click Here

Bread Board Power Supply

Overview:

Compatible with external DC/AC (5V to 12V) /USB source which will be converted to 3.3V and 5V and can be easily placed on a Bread Board. Thereafter could be used for circuits which use these voltage levels.

Bread Board Power supply:

Features:

• Output voltages could be taken via male burg stick.
• Each voltage level comes with a pair of terminals(Vcc and Gnd).
• A separate led indicators are used for both 5V and 3.3V.

For Code & Design Click Here