V. METHODOLOGY
A. Raspberry Pi Raspberry Pi [7] is a small computer board working on the Linux operating system which connects to a computer monitor, keyboard, and mouse. Raspberry Pi can be applied to a electronic structure and programming network work, it can also served as a personal computer and Apache Webserver, MySQL could be installed in the board. A GPIO [10] pin can be used as either a digital input or a digital output, and both operate at 3.3V. Unlike the Arduino, the Raspberry Pi which does not have any analog inputs. For
that you must use an external analog-to-digital converter (ADC) or connect the Pi to an interface board must be used.