The electric drive systems should possess some benchmark properties like linear control, reliability and steady operation. DC driven machines gain some advantage in these aspects. The speed control methods of DC motor plays a vital role in the performance of drive. The main purpose of speed controller is to focus on how we can use Bluetooth based device to control speed and direction of a DC motor at a desired speed and the main objective of dc drive is to maintain a system with the stable

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... irrespective of load condition. In this paper, we describe a recently developed "Android based speed control of DC motor", a smart phone 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 smart phone which is connected to the 8051 microcontroller, IC and DC Motor interfaced with a motor driver IC and ii) a Bluetooth module. The smart phone 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 input and output of the DC motor. In this paper visual display of the current position of the motor using sensors can be sent by the microcontroller to the smart phone. Our microcontroller-based remote control methodology using an android based smart phone can be readily applied and control the speed of DC motor through it.