Most of us started making pojects in arduino ide and later shifted to atmel studio for better performance and optimization. This library is for those who just started learning atmel stuido and ...

Connect a Photon to a keypad using either a MCP23008 or MCP23017 I2C controller. #include "Keypad_I2C.h" const byte ROWS = 4; //four rows const byte COLS = 3; //three columns char* I2CTYPE = "Adafruit ...

A keypad is one of the most commonly used input devices in microprocessor applications. In a standard keypad wired as an X-Y switch matrix, normally-open switches connect a row to a column when ...

Often times, we need to secure a room at our home or office (perhaps a secret dexter’s laboratory) so that no one can access the room without our permission and ensure protection against theft or loss ...