The Art of Clean Code _MAKE_POWER_PSU Note: The Arduino board requires

Note: The Arduino board requires an external power supply to drive the xbee module and relays

Adds four user-programmable buttons

Laser Ranging Sensor RS485 (4-400cm) x1

but you can find them here

The Art of Clean Code _MAKE_POWER_PSU Note: The Arduino board requiresMost software developers waste thousands of hours working with overly complex code. The eight core principles in The Art of Clean Code will teach you how to write clear, maintainable code without compromising functionality. The books guiding principle is simplicity: reduce and simplify, then reinvest energy in the important parts to save you countless hours and ease the often onerous task of code maintenance. Bestselling author Christian Mayer