Solar-Powered Android-Based Speed Control of DC Motor via Secure Bluetooth

In this paper, we describe a recently developed "Android based speed control of DC motor" smartphone control experimental setup that can be accessed via the Bluetooth. This setup consists of two basic primary elements communicating with each other: i) Bluetooth of smartphone which is connected to the Arduino Uno ATmega328P-Pu microcontroller, IC and DC Motor interfaced with a L293D motor driver IC and ii) a Bluetooth module HC-05. The smartphone sends/receives data to/from the microcontroller using the wireless technology via Bluetooth. An application based on Android is created and downloaded in the phone which acts as a display panel for the user to send/receive/view the output and input of the DC motor. The display includes a screen showing the commands and responses against each other. The motor can be rotated 0-360 degrees and can even change its direction from left to right until stopped. This can be done by downloading the Arduino compiler from the internet and programming it with the parameters of a control algorithm based on android smartphone. It has features such as end to end security by latest Android lollipop software which makes it a secure socket. This can be downloaded in the microcontroller using data transmission cable after compilation and verification of the authenticity of the program. In this project visual display of the current position of the motor using sensors can be sent by the microcontroller to the smartphone. Our microcontroller-based remote control methodology using an android based smartphone can be readily applied and control the speed of DC motor through it.