Tag: input

Using Arduino with a 3×4 keypad

Required Hardware Keypad 3×4 Arduino Board Breadboard Jumper Cables Well it’s a pretty useful device to input numbers and letters,  it can also be used for security measures like a keypad door lock, and it’s prefect when you need a

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MCP23017 Input Using I2C

Required Hardware Arduino Board Breadboard Breadboard Jumper Cables MCP23017 Expander LEDs Resistors 470ohm The MCP23017 is a 16-bit, general purpose parallel I/O port expander for I2C bus applications. The 16-bit I/O port functionally consists of two 8-bit ports (PORTA and

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